CN109374974B - Communication equipment interface parameter testing device - Google Patents
Communication equipment interface parameter testing device Download PDFInfo
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- CN109374974B CN109374974B CN201811390190.7A CN201811390190A CN109374974B CN 109374974 B CN109374974 B CN 109374974B CN 201811390190 A CN201811390190 A CN 201811390190A CN 109374974 B CN109374974 B CN 109374974B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a communication equipment interface parameter testing device, and belongs to the field of electronic measurement and testing. The device comprises: the device comprises an audio signal generating module, an isolation and amplitude adjusting module, a rectifying module, an analog-to-digital conversion module, a processing module, a digital-to-analog conversion module, a display module, a level adapting module, an amplifying module, a first connector, a second connector, a third connector, a fourth connector, a first gating switch, a second gating switch, a third gating switch, a fourth gating switch, a signal source internal resistance analog resistor, a first load resistor and a second load resistor. The processing module of the device realizes the connection combination among different modules by controlling each gating switch, realizes multiple parameter tests which can be completed by multiple test instruments by one device, and is convenient to carry; the device can also complete intermediate data recording in the test process and calculate the final result according to the intermediate data recording, simplify the test process, reduce human errors and ensure the accuracy of the test result.
Description
Technical Field
The invention relates to the field of electronic measurement and test, in particular to a communication equipment interface parameter testing device.
Background
A communication system is typically made up of several communication devices connected to each other. When system debugging and testing are performed, interface parameters of the devices need to be tested to verify whether the interface parameters meet the specified requirements. The parameters tested typically include audio interface inputs, output resistors, audio interface output signal levels, input control signal thresholds for the control interface, output control signal level values for the control interface, and the like.
When testing these parameters, it is necessary to use various measuring instruments such as an audio signal generator, an audio millivoltmeter, a direct current stabilized voltage supply, a direct current voltmeter and a test resistor, and in the testing process, according to the measured parameters or different tested devices, several measuring instruments and tested devices are connected according to a certain mode, and a series of operations such as reading, recording, calculating and sorting are performed to obtain a measurement result.
In carrying out the invention, the inventors have found that the prior art has at least the following problems:
the measuring instruments used in the testing process are more, so that the carrying, the mounting and the arrangement of the measuring instruments are inconvenient; in the test process, the intermediate result is recorded first, and then the final result is obtained through calculation, so that human errors can be introduced; in the process of continuously changing the connection modes of a plurality of test meters and a plurality of test wires between the tested devices according to different test parameters or the tested devices, the condition of mutual cross entanglement and aliasing arrangement among the test wires can occur, thereby causing the misconnection and missed connection of the test wires and influencing the test result.
Disclosure of Invention
The invention provides a communication equipment interface parameter testing device, which has the following technical scheme:
an interface parameter testing apparatus of a communication device, the apparatus comprising: an audio signal generating module, an isolation and amplitude adjusting module, a rectifying module, an analog/digital conversion module processing module, a digital/analog conversion module, a display module, a level adapting module, an amplifying module, a first connector K1 for connecting with an audio input interface of a communication device to be tested, a second connector K2 for connecting with an audio output interface of the communication device to be tested, a third connector K3 for connecting with a control output interface of the communication device to be tested, a fourth connector K4 for connecting with a control input interface of the communication device to be tested, a first gating switch S1, a second gating switch S2, a third gating switch S3, a fourth gating switch S4, a signal source internal resistance analog resistor R, a first load resistor R 1 And a second load resistor R 2 ；
The output end of the audio signal generating module is connected with the input end of the isolation and amplitude adjusting module, the output end of the isolation and amplitude adjusting module is connected with one end of the signal source internal resistance analog resistor r, the other end of the signal source internal resistance analog resistor r is respectively connected with the contact a of the first gating switch S1 and the contact c of the second gating switch, and the contact b of the first gating switch S1 is connected with the first connector K1; the input end of the rectifying module is connected with the contact a of the second gating switch S2, the contact b of the second gating switch S2 is connected with the second connector K2, the output end of the rectifying module is connected with the contact c of the third gating switch S3, the contact a of the third gating switch S3 is connected with the input end of the analog-to-digital conversion module, the contact b of the third gating switch S3 is connected with the output end of the level adaptation module, and the input end of the level adaptation module is connected with the third connector K3;
The output end of the analog/digital conversion module is connected with the processing module; the input end of the digital-to-analog conversion module is connected with the processing module, the output end of the digital-to-analog conversion module is connected with the input end of the amplifying module, the output end of the amplifying module is connected with the fourth connector K4, and the display module is connected with the processing module;
the first load resistor R 1 Is connected to the contact a of the fourth gating switch S4, the first load resistor R 1 The other end of the first electrode is grounded; the contact c of the fourth gating switch S4 is connected to the second connector K2 and the contact b of the second gating switch S2, respectively; the second load resistor R 2 Is connected with the input end of the level adapting module and the third connector K3, the second load resistor R 2 The other end of the first electrode is grounded; the control ends d of the first gating switch S1, the second gating switch S2, the third gating switch S3 and the fourth gating switch S4 are respectively connected with the processing module.
Further, the audio signal generating module is composed of an operational amplifier O 1 Transistor diode T 11 Transistor T 12 Resistance R 11 Resistance R 12 Resistance R 13 Resistance R 14 And capacitor C 11 Capacitance C 12 The Venturi bridge oscillating circuit is formed.
Further, the isolation and amplitude adjustment module comprises an operational amplifier O 21 Operational amplifier O 22 Potentiometer W, capacitor C 21 Capacitance C 22 And capacitor C 23 ；
The capacitor C 21 Is connected with the output end of the audio signal generating module, the capacitor C 21 Is connected with the other end of the operational amplifier O 21 Is connected with the non-inverting input terminal of the operational amplifier O 21 And the inverting input terminal of the operational amplifier O 21 Is connected with the output end of the capacitor C 22 One end of (a) is connected with the operational amplifier O 21 Is connected with the output end of the capacitor C 22 The other end of the potentiometer W is connected with one end of the potentiometer W, the other end of the potentiometer W is grounded, and the adjusting end of the potentiometer W is connected with the operational amplifier O 22 Is connected with the non-inverting input terminal of the operational amplifier O 22 And the inverting input terminal of the operational amplifier O 22 Is connected with the output end of the capacitor C 23 One end of (a) is connected with the operational amplifier O 22 Is connected with the output end of the capacitor C 23 The other end of the signal source internal resistance analog resistor r is connected with one end of the signal source internal resistance analog resistor r.
Further, the rectifying module comprises an operational amplifier O 31 Operational amplifier O 32 Transistor diode T 3 Capacitance C 31 Capacitance C 32 Resistance R 31 And an adjustable resistor R 32 ；
The capacitor C 31 Is connected to the contact a of the second gating switch S2, the capacitor C 31 Is connected with the other end of the operational amplifier O 31 Is connected with the non-inverting input terminal of the operational amplifier O 31 And the inverting input terminal of the operational amplifier O 31 Is connected with the output end of the transistor diode T 3 And the positive electrode of the operational amplifier O 31 Is connected with the output end of the transistor diode T 3 Is connected with the negative pole of the operational amplifier O 32 Is connected with the non-inverting input terminal of the operational amplifier O 32 And the inverting input terminal of the operational amplifier O 32 Is connected with the output end of the operational amplifier O 32 The output end of the third gating switch S3 is connected with a contact c of the third gating switch;
the capacitor C 32 One end of (a) is connected with the operational amplifier O 32 Is connected with the non-inverting input terminal of the capacitor C 32 The other end of the resistor R is grounded 31 One end of (a) is connected with the operational amplifier O 32 Is connected to the non-inverting input terminal of the resistor R 31 Is grounded at the other end of the adjustable resistor R 32 And the operational amplifier O 32 Is connected with the zero-setting end of the transformer.
Further, the analog-to-digital conversion module is an analog-to-digital conversion integrated circuit.
Further, the digital-to-analog conversion module comprises a digital-to-analog conversion integrated circuit.
Further, the digital-to-analog conversion module further comprises an operational amplifier O 6 And an adjustable resistor R 6 The digital-analog conversion integrated circuits are respectively connected with the operational amplifier O 6 Is connected to the non-inverting input terminal of the operational amplifier O 6 The output end of the adjustable resistor R is connected with the amplifying module 6 And the operational amplifier O 6 Is connected with the zero-setting end of the transformer.
Further, the level adaptation module comprises an operational amplifier O 8 Resistance R 81 Resistance R 82 And an adjustable resistor R 83 ；
The operational amplifier O 8 Is connected to the third connector K3, and the non-inverting input of the operational amplifier is also connected to the second load resistor R 2 Is connected with one end of the resistor R 81 One end of (a) is connected with the operational amplifier O 8 Is connected to the inverting input terminal of the resistor R 81 The other end of the first electrode is grounded; the resistor R 82 One end of (a) is connected with the operational amplifier O 8 Is connected to the inverting input terminal of the resistor R 82 Is connected with the other end of the operational amplifier O 8 Is connected with the output end of the operational amplifier O 8 Is connected with the output end of the (a)The contact b of the third gating switch S3 is connected with the adjustable resistor R 83 And the operational amplifier O 8 Is connected with the zero-setting end of the transformer.
Further, the amplifying module comprises an operational amplifier O 9 Resistance R 91 Resistance R 92 Resistance R 93 And an adjustable resistor R 94 ；
The resistor R 91 One end of (a) is connected with the operational amplifier O 9 Is connected to the inverting input of the resistor R 91 Is grounded at the other end of the operational amplifier O 9 Is also connected to the resistance R 92 Is connected with one end of the resistor R 92 Is connected with the other end of the operational amplifier O 9 Is connected with the output end of the resistor R 93 One end of (a) is connected with the operational amplifier O 9 Is connected with the output end of the resistor R 93 The other end of the (B) is connected with the fourth connector, the operational amplifier O 9 The homodromous input end of the adjustable resistor R is connected with the output end of the digital-analog conversion module 94 And the operational amplifier O 9 Is connected with the zero-setting end of the transformer.
Further, the device also comprises a key module, wherein the key module is connected with the processing module and comprises a test mode selection key P 1 Measurement action sequence start button P 2 Increment key P 3 And decrement key P 4 。
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
the testing device integrates the functions of various testing instruments and meters, and solves the problems of inconvenient carrying, installation and arrangement of the measuring instruments caused by more measuring instruments in the interface parameter testing process of the communication equipment. The processing module in the device has an automatic calculation function, can automatically record a plurality of intermediate test data in the interface test process of the communication equipment, give a final required result through calculation, simplify the complicated process of manually recording a plurality of intermediate data and obtaining the required result through post-finishing calculation, avoid errors possibly brought by the manual processing process and improve the accuracy of the test result. In addition, the testing device can automatically control the connection state between the contacts in the related gating switch according to different measurement modes according to a preset program, so that the connection relation between the modules is changed, the function of manually changing wiring between different instruments and equipment in the existing measurement mode is achieved, the problems of wrong connection and missed connection of the testing wire are avoided, meanwhile, the wiring time is shortened, and the testing efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is apparent that the drawings in the following description are only one embodiment of the present invention, and that other drawings may be obtained from the drawings without inventive work for those skilled in the art.
FIG. 1 is a block diagram of a communication device interface parameter testing apparatus according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a communication device interface parameter testing apparatus according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings.
Fig. 1 is a block diagram of an interface parameter testing apparatus of a communication device according to an embodiment of the present invention, where, as shown in fig. 1, the apparatus includes:
the audio signal generating module 100 (hereinafter referred to as module 100), the isolation and amplitude adjusting module 200 (hereinafter referred to as module 100), the rectifying module 300 (hereinafter referred to as module 100), the analog/digital converting module 400 (hereinafter referred to as module 100), the processing module 500 (hereinafter referred to as module 100), the digital/analog converting module 600 (hereinafter referred to as module 100), the display module 700 (hereinafter referred to as module 100), the level adapting module 800 (hereinafter referred to as module 100), the amplifying module 900 (hereinafter referred to as module 100), the first connector K1 (hereinafter referred to as K1) for interfacing with an audio input of a communication device under test, the second connector K1 for interfacing with the communication device under test A second connector K2 (hereinafter referred to as K2) for connecting with an audio output interface, a third connector K3 (hereinafter referred to as K3) for connecting with a control output interface of a communication device to be tested, a fourth connector K4 (hereinafter referred to as K4) for connecting with a control input interface of the communication device to be tested, a first gating switch S1 (hereinafter referred to as S1), a second gating switch S2 (hereinafter referred to as S2), a third gating switch S3 (hereinafter referred to as S3), a fourth gating switch S4 (hereinafter referred to as S4), a signal source internal resistance analog resistor R (hereinafter referred to as R), a first load resistor R 1 (hereinafter referred to as R) 1 ) And a second load resistor R 2 (hereinafter referred to as R) 2 )。
Referring to fig. 1, an output of the module 100 is connected to an input of the module 200, an output of the module 200 is connected to one end of r, the other end of r is connected to contacts a and c of S1 and S2, respectively, and contact b of S1 is connected to K1.
The input of the module 300 is connected with the contact a of the S2, the contact b of the S2 is connected with the K2, the output of the module 300 is connected with the contact c of the S3, the contact a of the S3 is connected with the input of the module 400, the contact b of the S3 is connected with the output of the module 800, and the input of the module 800 is connected with the K3.
The output of module 400 is connected to module 500, the input of module 600 is connected to module 500, the output of module 600 is connected to the input of module 900, and the output of module 900 is connected to K4. The module 700 is connected to the module 500.
R 1 Is connected with contact a of S4, R 1 The other end of which is grounded. Contact c of S4 is connected to contacts b of K2 and S2, respectively. R is R 2 Is connected to the input terminal of the module 800 and K3, R 2 The other end of which is grounded.
The control terminals d of S1, S2, S3 and S4 are each connected to the module 500.
The testing device integrates the functions of various testing instruments and meters, and solves the problems of inconvenient carrying, installation and arrangement of the measuring instruments caused by more measuring instruments in the interface parameter testing process of the communication equipment. The processing module in the device has an automatic calculation function, can automatically record a plurality of intermediate test data in the interface test process of the communication equipment, give a final required result through calculation, simplify the complicated process of manually recording a plurality of intermediate data and obtaining the required result through post-finishing calculation, avoid errors possibly brought by the manual processing process and improve the accuracy of the test result. In addition, the testing device can automatically control the connection state between the contacts in the related gating switch according to different measurement modes according to a preset program, so that the connection relation between the modules is changed, the function of manually changing wiring between different instruments and equipment in the existing measurement mode is achieved, the problems of wrong connection and missed connection of the testing wire are avoided, meanwhile, the wiring time is shortened, and the testing efficiency is improved.
In this embodiment, the parameter testing apparatus further includes a key module 1000, where the key module 1000 is connected to the module 500.
Further, the parameter testing device also comprises a power module (not shown in the figure), wherein each module in the parameter testing device is connected with the power module, and the power module outputs +5V, +12V and +15V voltages so as to meet the voltage requirements of each module in the device. Wherein the power supplies of the modules 400, 500, 600, 700 and 1000 are connected with +5V power supply, the power supplies of the S1, S2, S3 and S4 are connected with +12V power supply, and the power supplies of the other modules are connected with +15V power supply.
Fig. 2 is a schematic circuit diagram of a communication device interface parameter testing apparatus according to an embodiment of the present invention, wherein a module 100 is formed by an operational amplifier O 1 Transistor diode T 11 And T 12 Resistance R 11 Resistance R 12 Resistance R 13 Resistance R 14 And capacitor C 11 Capacitance C 12 The venturi bridge oscillation circuit is used as an audio signal source in the device.
Specifically, O 1 And R is the same direction input end of (C) 11 Is connected with one end of R 11 And C at the other end of (2) 11 Is connected with one end of C 11 And O at the other end of (2) 1 Is connected with the output end of O 1 And R is the same direction input end of (C) 12 Is connected with one end of R 12 The other end of the first electrode is grounded; o (O) 1 The same direction input end of (C) is also connected with C 12 Is connected with one end of the connecting rod,C 12 the other end of which is grounded.
O 1 And R 13 Is connected with one end of R 13 And T at the other end of (2) 11 Positive electrode connection of T 11 Negative electrode of (A) and O 1 Is connected with the output end of T 12 Connected in parallel with T 11 And (3) upper part. O (O) 1 And also with R 14 Is connected with one end of R 14 The other end of which is grounded. O (O) 1 Is connected to the input of the module 200.
The module 100 may also take other forms, such as a monolithic integrated circuit capable of generating sinusoidal audio signals, etc.
The module 200 includes an operational amplifier O 21 Operational amplifier O 22 Potentiometer W, capacitor C 21 Capacitance C 22 Capacitance C 23 . Wherein O is 21 And O 22 The voltage follower circuit is connected, and the signal buffer isolation between the input end and the output end of the module 200 is realized by utilizing the characteristics of high input impedance and low input impedance of the voltage follower circuit, so that the mutual influence between the front stage and the rear stage is avoided. C (C) 21 、C 22 、C 23 And plays a role in isolating direct current. W is used to adjust the amplitude of the audio signal output by the module 200 so that the level value of the output audio signal reaches the set value.
Specifically, C 21 Is connected to the output of the module 100, C 21 And O at the other end of (2) 21 Is connected with the non-inverting input terminal of O 21 Is connected with the inverted input end of O 21 Is connected with the output end of C 22 One end of (2) and an operational amplifier O 21 Is connected with the output end of C 22 The other end of W is connected with one end of W, the other end of W is grounded, and the regulating end of W is connected with O 22 Is connected with the non-inverting input terminal of O 22 Is connected with the inverted input end of O 22 Is connected with the output end of C 23 And O at one end of (2) 22 Is connected with the output end of C 23 And the other end of the (C) is connected with one end of r.
The potentiometer W in the embodiment of the present invention may be any potentiometer such as a rotary potentiometer or a push-pull potentiometer. By adjusting the potentiometer W, the level value of the audio signal output by the module 200 can be set to a set value.
The rectification module 300 includes an operational amplifier O 31 Operational amplifier O with DC zero adjustment 32 Transistor diode T 3 Capacitance C 31 Capacitance C 32 Resistance R 31 And an adjustable resistor R 32 . Wherein O is 31 And O 32 Is connected into a voltage follower circuit O 31 Is selectively connected to the A point or the B point, O 31 Is connected to the output terminal of the T-bridge 3 、C 31 And R is 31 The input end of the half-wave rectifying and filtering circuit is formed. O (O) 32 Is connected with the output end of the half-wave rectification filter circuit, O 32 Is connected to contact c of S3. O (O) 31 、O 32 The voltage follower circuit is formed to realize signal buffer isolation between the input end of the rectifying module 300 and the half-wave rectifying and filtering circuit and between the half-wave rectifying and filtering circuit and the output end of the rectifying module 300. C (C) 31 For coupling AC signals from points A or B and isolating DC signals, R 32 For O 32 Is adjusted in the zero position.
Specifically, C 31 Is connected with contact a of S2, C 31 And O at the other end of (2) 31 Is connected with the non-inverting input terminal of O 31 Is connected with the inverted input end of O 31 Is connected with the output end of T 3 Positive electrode of (c) and O 31 Is connected with the output end of T 3 Negative electrode of (A) and O 32 Is connected with the non-inverting input terminal of O 32 Is connected with the inverted input end of O 32 Is connected with the output end of O 32 Is connected to contact c of S3.
C 32 And O at one end of (2) 32 Is connected with the non-inverting input terminal of C 32 Is grounded at the other end of R 31 And O at one end of (2) 32 Is connected with the non-inverting input terminal of R 31 Is grounded at the other end of R 32 With O 32 Is connected with the zero-setting end of the transformer.
Module 400 includes an analog-to-digital conversion integrated circuit, and module 400 is configured to convert a dc level signal from the output of module 300 or the output of module 800 into a digital signal that can be collected and processed by module 500.
The module 600 includes a digital-to-analog conversion integrated circuit and an operational amplifier O having DC zero adjustment characteristics 6 And an adjustable resistor R 6 . The module 600 is configured to convert the digital signal from the output of the module 500 into a corresponding dc level. Wherein R is 6 For O 6 Is adjusted in the zero position.
Specifically, the integrated circuit for digital/analog conversion is respectively connected with O 6 Is connected with the non-inverting input terminal of (C) 6 Is connected to the module 900, R 6 With O 6 Is connected with the zero-setting end of the transformer.
The module 800 includes an operational amplifier O having DC zero adjustment characteristics 8 Resistance R 81 Resistance R 82 And an adjustable resistor R 83 . Module 800 is configured to convert a dc level signal from the K3 input ranging from 0V to 12V to a dc level signal ranging from 0V to 5V acceptable at the input of module 400. Wherein R is 83 For O 8 Is adjusted in the zero position. R is R 81 And R is R 82 The ratio of the input to output levels of block 800.
Specifically, O 8 Is connected with K3, O 8 And the non-inverting input terminal of (C) is also connected with R 2 Is connected with one end of R 81 And O at one end of (2) 8 Is connected with the inverting input terminal of R 81 Is grounded at the other end of R 82 And O at one end of (2) 8 Is connected with the inverting input terminal of R 82 And O at the other end of (2) 8 Is connected with the output end of O 8 Is connected with the contact b of S3, R 83 With O 8 Is connected with the zero-setting end of the transformer.
The module 900 includes an operational amplifier O with DC zero adjustment 9 Resistance R 91 Resistance R 92 Resistance R 93 And an adjustable resistor R 94 . The module 900 is configured to convert the dc level signal output from the module 600 and ranging from 0V to 5V into a dc level signal with a level ranging from 0V to 12V, which is required for measurement by the device, and send the dc level signal to the control interface of the communication device under test via K4. Wherein R is 94 For use inO 9 Is adjusted in the zero position. R is R 91 And R is R 92 Determines the ratio of the input to output levels of the module 900.
Specifically, R 91 And O at one end of (2) 9 Is connected with the reverse input end of R 91 Is grounded at the other end of O 9 And also with R 92 Is connected with one end of R 92 And O at the other end of (2) 9 Is connected with the output end of R 93 And O at one end of (2) 9 Is connected with the output end of R 93 Is connected with K4 at the other end, O 9 Is connected to the output of the module 600, R 94 With O 9 Is connected with the zero-setting end of the transformer.
In fig. 2, four gating switches S1, S2, S3, S4 have the same structure, and are each a relay KA and a transistor diode T A Transistor T B And resistance R K The composition is formed. The four gating switches realize gating among different modules under the control signal action of the module 500, and corresponding measuring signal paths are constructed for different measuring modes.
Taking S1 as an example, T A The coil is connected with both ends of the relay KA in parallel, one end of the coil of the relay KA is connected with the power supply module, and the other end of the coil of the relay KA is connected with the T B Is connected with the collector of T B Is grounded, T B Base and R of (2) K Is connected with one end of R K And the other end of the (c) is connected to the module 500.
The key module 1000 is composed of keys P 1 、P 2 、P 3 、P 4 And resistance R P1 、R P2 、R P3 And R is P4 The composition is formed. The operator inputs various operation instructions to the module 500 through the key module 1000. By setting a resistor R P1 、R P2 、R P3 And R is P4 It is possible to prevent damage to the module 500 from occurring due to excessive current entering the module 500.
Specifically, P 1 Is connected with the module 500 at one end, P 1 Is grounded at the other end of R P1 One end of (2) is connected with P 1 Is connected with one end of R P1 The other end of the power supply is connected with the power supply module. P (P) 2 One end of (2)Connected with the module 500, P 2 Is grounded at the other end of R P2 One end of (2) is connected with P 2 Is connected with one end of R P2 The other end of the power supply is connected with the power supply module. P (P) 3 Is connected with the module 500 at one end, P 3 Is grounded at the other end of R P3 Is connected with one end of P3, R P3 The other end of the power supply is connected with the power supply module. P (P) 4 Is connected with the module 500 at one end, P 4 Is grounded at the other end of R P4 One end of (2) is connected with P 4 Is connected with one end of R P4 The other end of the power supply is connected with the power supply module.
In the present embodiment, the key P 1 A test mode selection key for selecting various modes of operation. For example when the key P is pressed 1 When the two-press key P is pressed continuously, the audio input interface input resistance test mode is selected 1 When the test mode is selected, the audio output interface outputs a resistance test mode, and the like. When the mode is selected, the selection condition of the mode can be displayed in the module 700, so that a tester can intuitively see which test mode is specifically selected.
Button P 2 And a start button for measuring the action sequence is used for starting the testing process of the device. After selecting the test mode, by pressing the key P 2 A test action sequence of the corresponding parameters may be initiated. For example, after selecting the "audio input interface input resistance test mode" state, press key P 2 The device is controlled by the control module 500 to sequentially switch on related gating switches, sequentially connect related modules to form different test signal circuits, test and temporarily store various parameters of the audio input interface of the tested communication equipment, and display the input resistance of the audio input interface of the tested communication equipment through calculation.
Button P 3 May be an increment button for causing the module 500 to transmit a digital signal with a gradually increasing level value to the module 600 when testing the control signal threshold value of the control input interface or the level value of the control signal output by the control output interface.
Button P 4 May be a decrement key for controlling input during testingWhen the level value of the control signal of the interface is a threshold value or the level value of the control signal output by the control output interface is tested, the module 500 is caused to send a digital signal with the level value gradually reduced to the module 600.
It should be noted that, the number of the buttons in the mode selection module 1000 may be set to be plural according to actual needs, which is not limited by the present invention.
The display module 700 may be a commercially available universal liquid crystal display module, and is connected to the module 500 via a standard serial interface to provide display of test modes, status and measurement values for the device.
The processing module 500 may be a single-chip computer integrated circuit, an oscillating crystal, and a plurality of resistors and capacitors connected in a conventional manner to form a single-chip computer circuit.
r can be resistance with withstand power consumption not less than 0.25W and nominal resistance value of 300 Ω±10%. R is R 1 Can adopt a resistance with the tolerance power consumption not less than 0.25W and the nominal resistance value of 600 omega plus or minus 5 percent, R 2 A resistance with a withstand power consumption of not less than 0.25W and a nominal resistance of 5.1kΩ±10% may be employed.
The respective blocks of the device may be configured by the circuit elements and the connection means described above, and may be configured by other circuit elements and other connection means than those specifically described (for example, an operational amplifier having a zero adjustment function). For example, the audio signal generating module 100 may be formed by a circuit connection method such as a double-T bridge or directly formed by a monolithic integrated circuit using transistors and auxiliary resistance-capacitance elements. The elements described herein as being particularly limited, such as "operational amplifier with dc zero adjustment feature", should be selected as specified in the description.
The following operation steps and flow of testing interface parameters of communication equipment using the device are briefly described with reference to the accompanying drawings:
1. testing the input resistance R of an audio input interface 01
And connecting an audio input interface of the communication device to be tested with K1. Pressing key P 1 After selecting the mode of 'test audio input interface input resistance', press key P 2 Opening and closingMeasurement is started. At this time, the module 500 controls the contacts a and b of S1 to be opened, controls the contacts a and c of S2 to be closed, and controls the contacts a and c of S3 to be closed. The audio signal generated by the module 100 is sent to the module 300 through the modules 200, r and S2 in sequence, rectified into a dc level signal by the module 300, and then reaches the module 400 through S3. The module 400 converts the DC level signal into a digital signal and sends the digital signal to the module 500, and the module 500 collects the digital signal obtained at this time (without being connected to the audio input interface of the communication device under test), and obtains a level value at point A in FIG. 2, denoted as U 1 。
Then the module 500 controls the contacts a and b of the S1 to be closed, and acquires the digital signal output by the module 400 again, the module 500 acquires the digital signal acquired at the moment (connected with the audio input interface of the tested communication equipment), and another level value of the A point is acquired again and recorded as U 2 。
The module 500 obtains U according to the above steps 1 、U 2 And a known value of R, R is calculated according to the following formula 01 ：
R 01 ＝U 2 ×r/(U 1 -U 2 )。
Finally, module 500 calculates R 01 And output to the display module 700 for display.
2. Testing output resistance R of audio output interface 02
When testing the output resistance, the following two conditions are adopted:
1. the communication device under test itself may generate the audio output signal:
and connecting an audio output interface of the tested communication equipment with K2, and operating the tested communication equipment to generate an audio signal. Pressing key P 1 After selecting the mode of 'testing the output resistance 1 of the audio output interface', press the key P 2 The measurement is started. The module 500 controls contacts a and b of S2 to be on, contacts a and c of S3 to be on, and contacts a and c of S4 to be off. At this time, the audio signal output by the tested communication device is sent to the module 300 through K2 and S2 in sequence, rectified into a dc level signal by the module 300, and sent to the module 400 through S3. The module 400 generates the DC level signal based on the control signal of the module 500Is converted into a digital signal and sent to the module 500, and the module 500 collects the digital signal (point B is not accessed to R 1 ) The obtained digital signal is used to obtain a level value at point B in FIG. 2, denoted as U 1 。
Then the module 500 controls the contacts a and c of S4 to be closed, and acquires again the digital signal output by the module 400, and the module 500 acquires the signal (point B is accessed to point R 1 ) The obtained digital signal is used for obtaining another level value at the point B again and is recorded as U 2 。
Module 500 receives a U 1 、U 2 And R is known as 1 R is calculated according to the following formula 02 ：
R 02 ＝(U 1 -U 2 )×R 1 /U 2 。
Finally, module 500 calculates R 02 And output to the display module 700 for display.
2. The communication device under test itself cannot generate an audio signal:
and connecting an audio input interface of the communication equipment to be tested with K1, and connecting an audio output interface with K2. Pressing key P 1 After selecting the mode of 'testing the output resistance 2 of the audio output interface', press the key P 2 The measurement is started. The module 500 controls contacts a and b of S1 to be turned on, contacts a and b of S2 to be turned on, contacts a and c of S3 to be turned on, and contacts a and c of S4 to be turned off. At this time, the audio signal generated by the module 100 sequentially enters the audio input interface of the communication device to be tested through the modules 200, r and K1, is output from the audio output interface of the communication device to be tested, is sent to the module 300 through the modules K2 and S2, is rectified into a direct current level signal by the module 300, and is sent to the module 400 through the module S3. The module 400 converts the DC level signal into a digital signal and sends the digital signal to the module 500, and the module 500 collects the digital signal (point B is not connected to R 1 ) The obtained digital signal is recorded as U by a level value at the point B 1 。
Then the module 500 controls the contacts a and c of S4 to be closed, and acquires again the digital signal output by the module 400, and the module 500 acquires the signal (point B is accessed to point R 1 ) The obtained digital signal is used for obtaining another level value at the point B and is recorded as U 2 。
The module 500 obtains U according to the above steps 1 、U 2 And R is known as 1 R is calculated according to the following formula 02 ：
R 02 ＝(U 1 -U 2 )×R 1 /U 2 。
Finally, module 500 calculates R 02 And output to the display module 700 for display.
3. Testing the signal level U output by the audio output interface 01
Test U 01 The following two cases are adopted:
1. the communication device under test itself may generate an audio signal output:
and connecting an audio output interface of the tested communication equipment with K2, and operating the tested communication equipment to generate an audio signal. Pressing key P 1 After selecting the mode of 'signal level 1 output by test audio output interface', press key P 2 The measurement is started. The processing module 500 controls the contacts a and b of S2 to be turned on, controls the contacts a and c of S3 to be turned on, and controls the contacts a and c of S4 to be turned on. At this time, the audio signal output by the tested communication device is sent to the module 300 through K2 and S2 in sequence, rectified into a dc level signal by the module 300, and sent to the module 400 through S3. The module 400 converts the DC level signal into a digital signal and sends the digital signal to the module 500, and the module 500 collects the digital signal (B point is accessed to R 1 ) The obtained digital signal is recorded as U in the level value at the point B 01 . U is then assembled by module 500 01 And output to the display module 700 for display.
2. The communication device under test itself cannot produce an audio signal output:
and connecting an audio input interface of the communication equipment to be tested with K1, and connecting an audio output interface with K2. Pressing key P 1 After selecting the mode of 'testing the output resistance 2 of the audio output interface', press the key P 2 The measurement is started. The module 500 controls contacts a and b of S1 to be turned on, contacts a and b of S2 to be turned on, contacts a and c of S3 to be turned on, and contacts a and c of S4 to be turned on. The audio signals generated by the module 100 are sequentially subjected to the modeThe blocks 200, r and K1 enter the audio input interface of the tested communication equipment, are output from the audio output interface of the tested communication equipment, are sent to the module 300 through K2 and S2, are rectified into direct current level signals through the module 300, and are sent to the module 400 through S3. The module 400 converts the DC level signal into a digital signal and sends the digital signal to the module 500, and the module 500 collects the digital signal (B point is accessed to R 1 ) The obtained digital signal is recorded as U in the level value of the point B 01 . U is then assembled by module 500 01 And output to the display module 700 for display.
4. Control signal threshold value U for testing control input interface 11
The threshold value of the control signal input by the control input interface is a corresponding input level value at the moment when the state of the communication equipment to be tested changes when the level of the control signal input by the control input interface of the communication equipment to be tested changes from low to high or from high to low. The state change of the communication device comprises a perceptible audiovisual state change generated by the communication device or a level state change of a specified output signal of the communication device.
Test U 11 The following two cases are adopted:
1. the state of the control signal output by the control output interface of the communication equipment to be tested is controlled by the input control signal of the communication equipment to be tested:
this situation can be divided into two measurement modes:
a) Manually controlled measurement mode
And connecting a control input interface of the communication equipment to be tested with K4, and connecting a control signal output interface of the communication equipment to be tested with K3. Pressing key P 1 After selecting the mode of ' manual control measurement control input interface ' control signal threshold value 1 ', press key P 2 The measurement is started. The module 500 controls S3 contacts a and b to be closed. The key P is pressed successively 3 (or P) 4 ) Causing module 500 to send a digital signal to module 600 that is continuously incremented (or decremented) from the corresponding minimum (or maximum) level value. The module 600 converts the digital signal into corresponding DC level signal and sends it to the module 900, and then outputs it to the control of the communication device under test via K4 The input interface inputs a DC level signal with a level value which changes from low to high (or from high to low) in a stepwise manner. The module 500 sends the digital signal corresponding to the output level to the display module 700 for real-time display, and monitors the level value of the control signal output by the control output interface of the tested communication device collected by the measuring channels of the connector K3, the modules 800, S3 and the module 400. To increase the rate of increase (or decrease) of the level during the test, the pressed state may be kept unchanged after the P3 (or P4) button is pressed.
When the level value of the control signal outputted by the control output interface changes during the two adjacent input signal changes, the module 500 records the level value U of the digital signal sent to the module 700 at the moment 11 (i.e., the threshold value of the control signal controlling the input interface) keeps this value unchanged and sends a flag signal to the module 700 that the threshold level test is completed.
b) Automatic control measurement mode
And connecting a control input interface of the communication equipment to be tested with K4, and connecting a control signal output interface of the communication equipment to be tested with K3. Pressing key P 1 After selecting the mode of "control signal threshold value 1 of automatic control measurement control input interface", press key P 2 The module 500 controls S3 contacts a and b to be closed. Pressing the key P again 3 (or P) 4 ) Beginning automatic measurement, module 500 automatically sends a digital signal to module 600 that is continuously incremented (or decremented) from the corresponding minimum (or maximum) level value. The module 600 continuously converts the digital signal into a corresponding dc level signal and sends the signal to the module 900, and then inputs the dc level signal with a level value that changes from low to high (or from high to low) to the control input interface of the measured communication device via K4. The module 500 sends the digital signal corresponding to the output level to the display module 700 for real-time display, and monitors the level value of the control signal output by the control output interface of the tested communication device collected by the measuring channels of the connector K3, the modules 800, S3 and the module 400.
When the control signal output by the control output interface is found to be in the process of two adjacent input signal changes, the control signal is electrically connected with the control output interfaceWhen the flat value changes, the module 500 records the level value U of the digital signal sent by the module 500 to the module 700 at the moment 11 (i.e., the threshold value of the control signal controlling the input interface) keeps this value unchanged and sends a flag signal to the module 700 that the threshold level test is completed.
2. When the level value of the control signal input by the input interface of the tested communication equipment changes, the tested communication equipment only generates externally-perceived state changes such as audio-visual and the like:
this situation can be divided into two measurement modes:
a) Manually controlled measurement mode
The control input interface of the communication device under test is connected with K4. Pressing key P 1 After selecting the "manual measurement control input interface control signal threshold value 2" mode, press key P 2 The measurement is started. The module 500 controls S3 contacts a and b to be closed. The key P is pressed successively 3 (or P) 4 ) Causing module 500 to send a digital signal to module 600 that is continuously incremented (or decremented) from the corresponding minimum (or maximum) level value. The module 600 converts the digital signal into a corresponding dc level signal and sends the signal to the module 900, and then inputs the dc level signal with a level value that changes from low to high (or from high to low) in a stepwise manner to the control input interface of the communication device under test via K4. The module 500 sends the digital signal corresponding to the output level to the display module 700 for real-time display, and monitors the communication device under test.
When the detected communication device is found to produce a perceptible change in audiovisual state, pressing P3 (or P4) is stopped, module 500 no longer transmits a digital signal to module 700, while module 500 records the level value U of the digital signal transmitted to module 700 at the moment 11 (i.e., the control signal threshold value of the control input interface).
b) Automatic control measurement mode
The control input interface of the communication device under test is connected with K4. Pressing key P 1 After selecting the "control signal threshold value 2" mode of automatic control measurement control input interface, press key P 2 The module 500 controls S3 contacts a and b to be closed. Pressing againPush button P 3 (or P) 4 ) Beginning automatic measurement, module 500 automatically sends a digital signal to module 600 that is continuously incremented (or decremented) from the corresponding minimum (or maximum) level value. The module 600 continuously converts the digital signal into a corresponding dc level signal and sends the signal to the module 900, and then inputs the dc level signal with a level value that changes from low to high (or from high to low) to the control input interface of the measured communication device via K4. The module 500 sends the digital signal corresponding to the output level to the display module 700 for real-time display, and monitors the communication device under test.
When the detected communication device is found to produce a perceptible change in audiovisual state, the module 500 no longer transmits a digital signal to the module 700, while the module 500 records the level value U of the digital signal transmitted to the module 700 at the moment 11 (i.e., the control signal threshold value of the control input interface).
Specifically, the level value of the digital signal output from the module 500 to the module 600 may vary in the range of 0 to 12V, or may vary in the range of 0 to 5V, which is not limited in the present invention.
5. Level value U of control signal output by test control output interface 12
Test U 12 The following two cases are adopted:
1. the level state of the control signal of the output interface of the communication device to be tested is controlled by the input control signal of the communication device to be tested:
and connecting a control output interface of the communication equipment to be tested with K3, and connecting a control input interface of the communication equipment with K4. Pressing key P 1 After selecting the mode of 'level value 1 of control signal output by test control output interface', press key P 2 The measurement is started. The module 500 controls S3 contacts a and b to be closed. The control signal output by the tested communication device is sent to the module 500 after passing through the K3, the module 800, the S3 and the module 400 in sequence, and the module 500 obtains the level value of the control signal sent by the module 400 and displays the level value by the sending module 700. The key P is pressed successively 3 (or P) 4 ) Causing module 500 to send a digital signal corresponding to the specified level value to module 600, the digital signalThe level value of the signal follows the key P 3 (or P) 4 ) To change from low to high (or from high to low) with each press of (a) is performed. In this process, the low level value and the high level value displayed by the acquisition module 700 are denoted as U 12 。
2. The high-low state of the level value of the control signal output by the tested communication device is irrelevant to the input control signal of the tested communication device:
the control output interface of the communication device is connected to the connector K4. Pressing key P 1 After selecting the mode of 'level value 2 of control signal output by test control output interface', press key P 2 The measurement is started. The module 500 controls S3 contacts a and b to be closed. The control signal output by the tested communication device is sent to the module 500 after passing through the K3, the module 800, the S3 and the module 400 in sequence, and the module 500 obtains the level value of the control signal sent by the module 400 and displays the level value by the sending module 700. The measured communication equipment is operated, so that the level value of the control signal output by the control output interface of the measured communication equipment is changed from low to high (or from high to low). In this process, the low level value and the high level value displayed by the acquisition module 700 are denoted as U 12 。
It should be noted that: the communication device interface parameter testing apparatus provided in the above embodiment only illustrates the division of the above functional modules when testing the interface parameters of the communication device, and in practical application, the above functional allocation may be completed by different functional modules according to needs, that is, the internal structure of the apparatus is divided into different functional modules to complete all or part of the functions described above.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. A communications device interface parameter testing apparatus, the apparatus comprising: an audio signal generating module (100), an isolation and amplitude adjusting module (200), a rectifying module (300) and an analog/digital converterA conversion module (400), a processing module (500), a digital-to-analog conversion module (600), a display module (700), a level adaptation module (800), an amplification module (900), a first connector K1 for connecting with an audio input interface of a communication device under test, a second connector K2 for connecting with an audio output interface of the communication device under test, a third connector K3 for connecting with a control output interface of the communication device under test, a fourth connector K4 for connecting with a control input interface of the communication device under test, a first gating switch S1, a second gating switch S2, a third gating switch S3, a fourth gating switch S4, a signal source internal resistance analog resistor R, a first load resistor R 1 And a second load resistor R 2 ；
The device further comprises a power supply module, wherein the audio signal generating module (100), the isolating and amplitude adjusting module (200), the rectifying module (300), the analog-to-digital conversion module (400), the processing module (500), the digital-to-analog conversion module (600), the display module (700), the level adapting module (800) and the amplifying module (900) are all connected with the power supply module;
the output end of the audio signal generating module (100) is connected with the input end of the isolation and amplitude adjusting module (200), the output end of the isolation and amplitude adjusting module (200) is connected with one end of the signal source internal resistance analog resistor r, the other end of the signal source internal resistance analog resistor r is respectively connected with the contact a of the first gating switch S1 and the contact c of the second gating switch, and the contact b of the first gating switch S1 is connected with the first connector K1; the input end of the rectifying module (300) is connected with the contact a of the second gating switch S2, the contact b of the second gating switch S2 is connected with the second connector K2, the output end of the rectifying module (300) is connected with the contact c of the third gating switch S3, the contact a of the third gating switch S3 is connected with the input end of the analog-to-digital conversion module (400), the contact b of the third gating switch S3 is connected with the output end of the level adaptation module (800), and the input end of the level adaptation module (800) is connected with the third connector K3;
The output end of the analog/digital conversion module (400) is connected with the processing module (500); the input end of the digital-to-analog conversion module (600) is connected with the processing module (500), the output end of the digital-to-analog conversion module (600) is connected with the input end of the amplifying module (900), the output end of the amplifying module (900) is connected with the fourth connector K4, and the display module (700) is connected with the processing module (500);
the first load resistor R 1 Is connected to the contact a of the fourth gating switch S4, the first load resistor R 1 The other end of the first electrode is grounded; the contact c of the fourth gating switch S4 is connected to the second connector K2 and the contact b of the second gating switch S2, respectively; the second load resistor R 2 Is connected to the input of the level adaptation module (800) and the third connector K3, respectively, the second load resistor R 2 The other end of the first electrode is grounded; the control ends d of the first gating switch S1, the second gating switch S2, the third gating switch S3 and the fourth gating switch S4 are respectively connected with the processing module (500).
2. The apparatus of claim 1, wherein the audio signal generating module (100) is formed by an operational amplifier O 1 Transistor diode T 11 Transistor T 12 Resistance R 11 Resistance R 12 Resistance R 13 Resistance R 14 And capacitor C 11 Capacitance C 12 The Venturi bridge oscillating circuit is formed.
3. The apparatus of claim 1, wherein the isolation and amplitude adjustment module (200) comprises an operational amplifier O 21 Operational amplifier O 22 Potentiometer W, capacitor C 21 Capacitance C 22 And capacitor C 23 ；
The capacitor C 21 Is connected to the output end of the audio signal generating module (100)The capacitor C 21 Is connected with the other end of the operational amplifier O 21 Is connected with the non-inverting input terminal of the operational amplifier O 21 And the inverting input terminal of the operational amplifier O 21 Is connected with the output end of the capacitor C 22 One end of (a) is connected with the operational amplifier O 21 Is connected with the output end of the capacitor C 22 The other end of the potentiometer W is connected with one end of the potentiometer W, the other end of the potentiometer W is grounded, and the adjusting end of the potentiometer W is connected with the operational amplifier O 22 Is connected with the non-inverting input terminal of the operational amplifier O 22 And the inverting input terminal of the operational amplifier O 22 Is connected with the output end of the capacitor C 23 One end of (a) is connected with the operational amplifier O 22 Is connected with the output end of the capacitor C 23 The other end of the signal source internal resistance analog resistor r is connected with one end of the signal source internal resistance analog resistor r.
4. The parametric test device of claim 1, wherein the rectifying module (300) comprises an operational amplifier O 31 Operational amplifier O 32 Transistor diode T 3 Capacitance C 31 Capacitance C 32 Resistance R 31 And an adjustable resistor R 32 ；
The capacitor C 31 Is connected to the contact a of the second gating switch S2, the capacitor C 31 Is connected with the other end of the operational amplifier O 31 Is connected with the non-inverting input terminal of the operational amplifier O 31 And the inverting input terminal of the operational amplifier O 31 Is connected with the output end of the transistor diode T 3 And the positive electrode of the operational amplifier O 31 Is connected with the output end of the transistor diode T 3 Is connected with the negative pole of the operational amplifier O 32 Is connected with the non-inverting input terminal of the operational amplifier O 32 And the inverting input terminal of the operational amplifier O 32 Is connected with the output end of the operational amplifier O 32 The output end of the third gating switch S3 is connected with a contact c of the third gating switch;
the capacitor C 32 One end of (a) is connected with the operational amplifier O 32 Is connected with the non-inverting input terminal of the capacitor C 32 The other end of the resistor R is grounded 31 One end of (a) is connected with the operational amplifier O 32 Is connected to the non-inverting input terminal of the resistor R 31 Is grounded at the other end of the adjustable resistor R 32 And the operational amplifier O 32 Is connected with the zero-setting end of the transformer.
5. The apparatus of claim 1, wherein the analog-to-digital conversion module (400) is an analog-to-digital conversion integrated circuit.
6. The apparatus of claim 1, wherein the digital-to-analog conversion module (600) comprises a digital-to-analog conversion integrated circuit.
7. The apparatus of claim 6, wherein the digital-to-analog conversion module (600) further comprises an operational amplifier O 6 And an adjustable resistor R 6 The digital-analog conversion integrated circuits are respectively connected with the operational amplifier O 6 Is connected to the non-inverting input terminal of the operational amplifier O 6 Is connected to the amplifying module (900), the adjustable resistor R 6 And the operational amplifier O 6 Is connected with the zero-setting end of the transformer.
8. The apparatus of claim 1, wherein the level adaptation module (800) comprises an operational amplifier O 8 Resistance R 81 Resistance R 82 And an adjustable resistor R 83 ；
The operational amplifier O 8 Is connected to the third connector K3, and the non-inverting input of the operational amplifier is also connected to the second load resistor R 2 Is connected with one end of the resistor R 81 One end of (a) is connected with the operational amplifier O 8 Is connected to the inverting input terminal of the resistor R 81 The other end of the first electrode is grounded; the resistor R 82 One end of (a) is connected with the operational amplifier O 8 Is connected to the inverting input terminal of the resistor R 82 Is connected with the other end of the operational amplifier O 8 Is connected with the output end of the operational amplifier O 8 The output end of the third gating switch S3 is connected with the contact b of the third gating switch S3, and the adjustable resistor R 83 And the operational amplifier O 8 Is connected with the zero-setting end of the transformer.
9. The apparatus of claim 1, wherein the amplification module (900) comprises an operational amplifier O 9 Resistance R 91 Resistance R 92 Resistance R 93 And an adjustable resistor R 94 ；
The resistor R 91 One end of (a) is connected with the operational amplifier O 9 Is connected to the inverting input of the resistor R 91 Is grounded at the other end of the operational amplifier O 9 Is also connected to the resistance R 92 Is connected with one end of the resistor R 92 Is connected with the other end of the operational amplifier O 9 Is connected with the output end of the resistor R 93 One end of (a) is connected with the operational amplifier O 9 Is connected with the output end of the resistor R 93 The other end of the second circuit is connected with the fourth connector K4, and the operational amplifier O 9 Is connected with the output end of the digital-to-analog conversion module (600), and the adjustable resistor R 94 And the operational amplifier O 9 Is connected with the zero-setting end of the transformer.
10. The device according to any one of claims 1-9, further comprising a key module (1000), said key module (1000) being connected to said processing module (500), said key module (1000) comprising a test mode selection key P 1 Measurement action sequence start button P 2 Increment key P 3 And decrement key P 4 。
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