CN112557722A - Universal oscillograph - Google Patents
Universal oscillograph Download PDFInfo
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- CN112557722A CN112557722A CN202011430459.7A CN202011430459A CN112557722A CN 112557722 A CN112557722 A CN 112557722A CN 202011430459 A CN202011430459 A CN 202011430459A CN 112557722 A CN112557722 A CN 112557722A
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- 238000012360 testing method Methods 0.000 claims abstract description 129
- 238000005259 measurement Methods 0.000 claims abstract description 72
- 239000000523 sample Substances 0.000 claims abstract description 49
- 238000012545 processing Methods 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 7
- 230000003044 adaptive effect Effects 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims 1
- 210000001503 joint Anatomy 0.000 abstract description 8
- 238000002955 isolation Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000003321 amplification Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 241001422033 Thestylus Species 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R13/00—Arrangements for displaying electric variables or waveforms
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/12—Circuits for multi-testers, i.e. multimeters, e.g. for measuring voltage, current, or impedance at will
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Abstract
The invention provides a universal oscillograph, which comprises a shell, a processing CPU, a display LCD and a buzzer, a current testing part and a voltage testing part, wherein the processing CPU, the display LCD and the buzzer are arranged in the shell; the current testing part is electrically connected with the CPU and is used for measuring alternating current and direct current, and a clamp meter current probe is arranged on the current testing part; the voltage testing part is electrically connected with the CPU and used for measuring alternating current and direct current voltages, and a meter pen is arranged on the voltage testing part; the root of the meter pen is different from the root of the clamp meter current probe, so that the root of the meter pen and the root of the clamp meter current probe clamp a corresponding object to be measured; the root of the meter pen is different from the root of the current probe of the clamp meter, so that the butt joint error of the root of the meter pen and the root of the current probe of the clamp meter can be effectively avoided, the physical isolation of current measurement and voltage measurement is realized, and the condition that the gear error of a conventional multimeter causes protection misoperation is avoided.
Description
Technical Field
The invention relates to the technical field of oscillometers, in particular to a universal oscillometer.
Background
The universal meter passes through the pen-shape metre and contacts the performance parameter of determinand in order to measure the determinand, in prior art, adopt conventional universal meter measuring voltage, when electric current and resistance, need frequently switch over the test gear, change the test pen jack, when misuse electric current gear, resistance gear or pen-shape metre hole insert the mistake and will cause direct current system busbar ground when carrying out direct current voltage measurement, when the busbar reaches current coil's requirement to the electric current of the distributed capacitance discharge on ground, then can lead to tripping operation return circuit switch-on and then cause the accident tripping operation, make conventional universal meter arouse the protection maloperation easily. When the conventional multimeter is used for testing the resistance, the phenomenon that the resistance measurement is inaccurate due to interference exists. The conventional multimeter can not display waveforms, an oscilloscope is required for waveform display, the conventional multimeter can not test phases, and a phase meter is required for phase measurement.
Disclosure of Invention
The invention aims to provide a universal oscillograph, which solves the problems that the conventional multimeter in the prior art is easy to cause protection misoperation, has multiple operation and use steps, is easy to make mistakes and has no waveform display function.
In order to solve the technical problems, the invention adopts the following technical scheme:
according to one aspect of the present invention, there is provided a universal oscillometer, comprising: a housing; the processing CPU, the display LCD and the buzzer are arranged in the shell; a current testing part which is electrically connected with the processing CPU and is used for measuring current; a current probe of a clamp meter is arranged on the current testing part; a voltage testing part which is electrically connected with the processing CPU and is used for measuring voltage; the voltage testing part is provided with a meter pen, and the meter pen and the clamp meter current probe are arranged at intervals; the root of the meter pen is different from the root of the current probe of the clamp meter.
Optionally, the clamp meter current probes have multiple types, and the precision of each clamp meter current probe is different and can be connected with the current testing part.
Optionally, the universal oscillograph further includes a gear control relay, which is connected to the processing CPU and controls the current testing unit and the voltage testing unit to adjust a testing range of the processing CPU and make the current testing unit and the voltage testing unit adapt to the testing range of the processing CPU.
Optionally, the gear control relay is provided with a signal channel and a display screen connected to the signal channel, and the signal channel isolates, amplifies and filters the signal output by the current testing part or the voltage testing part so as to output the signal to the display screen for display.
Optionally, the universal oscillograph further includes a monitoring unit, which is connected to the gear control relay and records the signal output by the gear control relay to determine the phase angle change of the object to be measured.
Optionally, the gear control relay 4 adjusts the gear, and when the gear is adjusted to the phase test gear, the reference voltage/reference current is prompted to be accessed, and the corresponding phase is adjusted.
Optionally, the gear control relay 4 adjusts the gear, the processing CPU enters a voltage measurement, current measurement, resistance measurement, capacitance measurement, inductance measurement, or phase measurement process, and the measurement channel corresponding thereto isolates, amplifies, and filters the measurement parameter signal.
Optionally, the universal oscillograph is provided with a switching circuit, and the switching circuit is connected with the current testing part and the voltage testing part and is used for automatically adjusting an alternating current test or a direct current test;
the switching circuit monitors the signal output by the current testing part or the voltage testing part and matches the testing type of the processing CPU.
Optionally, the universal oscillometer may use a meter pen to perform resistance measurement, before measurement, an interference voltage is measured, and when the interference voltage is greater than a set value, the switching circuit stays in voltage measurement and is not switched to resistance measurement.
Optionally, the switching circuit is provided with a judging part, and the judging part collects the signal output by the current testing part or the voltage testing part and judges whether the signal output by the current testing part or the voltage testing part exceeds a corresponding threshold value.
Optionally, the universal oscillometer has an interference display function, and performs waveform display on the resistance test result, so that a tester can observe whether the test resistance has interference in real time.
Optionally, the universal oscillometer is provided with an early warning part, and the early warning part is connected with the judging part and warns based on the signal of the judging part.
Optionally, the universal oscillograph has a vector monitoring function, and can mark the voltage magnitude of the current to be tested, and determine the phase of the current and the voltage to be tested according to the set phase of the reference voltage and the reference current, and determine whether the current and the voltage are reversed.
Optionally, the universal oscillometer is provided with a system frequency automatic discrimination function, a power system fault discrimination function and a range self-adaption function.
According to the technical scheme, the embodiment of the invention at least has the following advantages and positive effects:
in the universal oscillograph of the embodiment of the invention, a current testing part is electrically connected with a processing CPU and used for measuring alternating current and direct current, and a clamp meter current probe is arranged on the current testing part; the voltage testing part is electrically connected with the CPU and used for measuring alternating current and direct current voltages, and a meter pen is arranged on the voltage testing part; the root of the meter pen is different from the root of the clamp meter current probe, so that the root of the meter pen and the root of the clamp meter current probe clamp a corresponding object to be measured; the root of the meter pen is different from the root of the current probe of the clamp meter, so that the butt joint error of the root of the meter pen and the root of the current probe of the clamp meter can be effectively avoided, the physical isolation of current measurement and voltage measurement is realized, and the condition that the gear error of a conventional multimeter causes protection misoperation is avoided.
Drawings
FIG. 1 is a block diagram of a universal oscillograph according to an embodiment of the present application.
FIG. 2 is a schematic diagram of an AC/DC current measuring circuit of a universal oscillograph according to an embodiment of the present application.
FIG. 3 is a schematic diagram of an AC/DC voltage measuring circuit of a universal oscillograph according to an embodiment of the present application.
FIG. 4 is a schematic diagram of a resistance measurement circuit of a universal oscillograph according to an embodiment of the present application.
FIG. 5 is a schematic diagram of range adaptation for a universal oscillograph according to an embodiment of the present application.
The reference numerals are explained below:
the device comprises a processing CPU1, a current testing part 2, a clamp meter current probe 21, a voltage testing part 3, a meter pen 31, a gear control relay 4 and a switching circuit 5.
Detailed Description
Exemplary embodiments that embody features and advantages of the invention are described in detail below in the specification. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.
The universal meter contacts the object to be measured through the meter pen so as to measure the performance parameters of the object to be measured, in the prior art, when the conventional universal meter is adopted to measure the voltage to ground of a branch circuit, the bus of a direct current system is grounded when the conventional universal meter is misused to measure, and when the current discharged by the bus to the ground distributed capacitor reaches the requirement of a current coil, a tripping circuit is connected so as to trigger accident tripping, so that the conventional universal meter can easily trigger protection misoperation.
Referring to fig. 1 to 5, the present invention provides a universal oscillograph, which includes a housing, a processing CPU1, a current testing portion 2 and a voltage testing portion 3.
The processing CPU1 is mounted within the housing as a CPU for a universal oscillograph that integrates a variety of operations, including, but not limited to, dc voltage measurement, dc current measurement, ac voltage measurement, ac current measurement, resistance measurement, and phase measurement.
The interfaces of the processing CPU1 comprise 2 input ports of the meter pen 31, more than or equal to 1 current probe interface and 1 button. Besides the processing CPU1, the number of the stylus 31 is more than or equal to 2, and the number of the current clamp meters is more than or equal to 1.
The current testing part 2 is electrically connected with the processing CPU1 and is used for measuring current; the current testing part 2 is provided with a clamp meter current probe 21, and the clamp meter current probe 21 is contacted with an object to be tested so as to realize that the current testing part 2 tests the current of the object to be tested.
The clamp meter current probes 21 have various models, the accuracy of each clamp meter current probe is different, the clamp meter current probes can be connected with the current testing part 2, the testing range of the current testing part 2 is limited by butting the clamp meter current probes 21 of different models with the current testing part 2, the clamp meter current probes 21 of proper models are selected in the proper testing range, and the testing accuracy of the current testing part 2 is improved.
The current is input by adopting the clamp meter current probe 21, and different clamp meter current probes 21 can be replaced, so that the current with different amplitudes can be measured.
The voltage testing part 3 is electrically connected with the processing CPU1 and is used for measuring voltage; the voltage testing part 3 is provided with a meter pen 31, and the meter pen 31 is contacted with the object to be tested, so that the current testing part 2 tests the voltage of the object to be tested.
The meter pen 31 and the clamp meter current probe 21 are arranged at intervals and are alternatively connected with an object to be tested, wherein the meter pen 31 and the clamp meter current probe 21 are alternatively connected with the processing CPU1, so that the processing CPU1 can singly test the voltage or the current of the object to be tested, the butt joint error of the root of the meter pen 31 and the root of the clamp meter current probe 21 is effectively avoided, and the protection misoperation caused by the butt joint error of the multimeter is avoided.
The root of the meter pen 31 is different from the root of the clamp meter current probe 21, so that the root of the meter pen 31 and the root of the clamp meter current probe 21 clamp a corresponding object to be tested, voltage testing or current testing is realized corresponding to the root of the meter pen 31 and the root of the clamp meter current probe 21, and because the root of the meter pen 31 is different from the root of the clamp meter current probe 21, the butt joint error of the root of the meter pen 31 and the root of the clamp meter current probe 21 is effectively avoided, and protection misoperation caused by the butt joint error of the multimeter is avoided.
Referring to fig. 1 to 4, the universal oscillograph further includes a shift position control relay 4, where the shift position control relay 4 is connected to the processing CPU1 and controls the current test unit 2 and the voltage test unit 3 to adjust the test range of the processing CPU1, and make the current test unit 2 and the voltage test unit 3 adapt to the test range of the processing CPU 1.
The universal oscillograph also comprises a monitoring part which is in butt joint with the gear control relay 4 and records signals output by the gear control relay 4 so as to judge the phase angle change of the object to be detected.
The gear control relay 4 can select a phase gear, select the meter pen 31 and the clamp meter current probe 21 according to actual measurement requirements for measurement, record the starting time and the periodic waveform of voltage and current, and judge whether the system has the condition of phase angle change according to the record.
In addition, the gear control relay 4 is provided with a signal channel and a display screen connected with the signal channel, and the signal channel isolates, amplifies and filters the signal output by the current testing part 2 or the voltage testing part 3 so as to output the signal to the display screen for displaying.
And the gear control relay 4 adjusts the gear, the processing CPU enters the processes of voltage measurement, current measurement, resistance measurement, capacitance measurement, inductance measurement or phase measurement, a measurement channel corresponding to the processing CPU isolates, amplifies and filters a measurement parameter signal, and the host can enter the processes of voltage measurement, current measurement, resistance measurement, capacitance measurement, inductance measurement, phase measurement and the like by selecting the gear control relay 4. And the signals enter corresponding measurement channels to isolate, amplify and filter the measurement parameter signals, and then the signals are transmitted to a processing CPU1 to be analyzed and processed, and finally the signals are displayed on a display screen.
Specifically, the current signal amplification adopts differential signal amplification with the amplification factor of 1.6, and because the sampling reference is 2.5V based on the CPU, the signal amplification output is subjected to 1.25V raising processing, so that the negative current signal can be sampled and measured. After AD conversion, the current is sampled, analyzed and calculated by a high-precision singlechip, and the measured current is displayed.
Furthermore, in order to measure the waveform more intuitively, the measurement result is divided into an alternating current part and a direct current part. The DC part only displays numerical values, and the AC part displays numerical values and waveforms. If a certain signal is formed by alternating current and direct current superposition, the signal is displayed as DC, V/A and AC, and the waveform only displays an alternating current partial waveform.
In addition, the gear control relay 4 adjusts the gear, and when the gear is adjusted to the phase test gear, the reference voltage/reference current is prompted to be accessed, and the corresponding phase is adjusted, wherein the universal oscillograph is used for testing the five to be tested, so that the operation can be greatly simplified. When the gear is adjusted to the phase test gear, the user is prompted to access the reference voltage/reference current, and if the input of the voltage meter pen 31/current probe is detected, the phase of the voltage/current is selected through the button. Of course, when the gear is adjusted to the phase test gear, it may prompt to access the phase a voltage and phase a current, and when it is detected that the voltage meter pen 31/current probe has an input, it prompts "please confirm that the access voltage/current is phase a" (calculating according to the phase a current voltage as an example). The mark start time T0 of the voltage and current is recorded, the mark time can be selected as the time of the 0-passing point of the rising edge (the moment when the voltage and current rise from the negative value to the positive value and the amplitude just reaches 0), the time of the maximum value can be selected, the time of the minimum value can be set, the time of the 0-point of the falling edge can be set, and the period T of the waveform is recorded.
Judging the system time: if the period T is tested to be 20ms +/-x, wherein x is an error allowance setting value, a 50HZ system is judged, and if the period T is tested to be 16.67ms +/-x, wherein x is an error allowance setting value, a 60HZ system is judged. If the monitored time period is not aligned with the previously recorded data, it is possible that a power system failure could result in current and voltage fluctuations or a failure of the time counter of the instrument. When the monitored current is larger than a set value, judging that the power system has a fault, reporting that the power system has the fault, and asking for retesting after the fault disappears, when the monitored voltage is larger than an interference set threshold (such as 30% UN) and smaller than the set value (such as 80% UN), judging that the power system has the fault, reporting that the power system has the fault, asking for retesting after the fault disappears, and if the monitored voltage and the monitored current are larger than the set value, and continuously testing that the data of y (the set value can be set as 5) periods T do not correspond to the data recorded before, judging that the instrument time counter has the fault, and giving an alarm that the time counter has the fault, and asking for maintenance.
After the accurate data is recorded, the input of other phase voltages and currents is prompted. When the amplitude of the input voltage/current is larger than a set value, recording a marking time sequence of a waveform, when the marking time sequence is equal to T0+ nT or the error is within a set range, judging that the input voltage and the input current are in an A phase, and when the marking time sequence is equal to T0+ nT +/-0.5T or the error is within the set range, judging that the A phase of the input voltage and the input current is opposite; when the marking time sequence is equal to T0+ nT +0.333T or the error is within a set range, judging that the input voltage and the current are B phases, and when the marking time sequence is equal to T0+ nT +0.8333T or the error is within the set range, judging that the voltage and the current are B phases in opposite directions; when the marking time sequence is equal to T0+ nT-0.333T or the error is within a set range, judging that the input voltage and the input current are in a C phase, and when the marking time sequence is equal to T0+ nT +0.167T or the error is within the set range, judging that the voltage and the current are in a reverse phase;
if the phases of the current and the voltage are not A, B, C phases, the system angle is judged to be changed possibly, or the time of the instrument is changed, and the A phase (reference phase) is prompted to be calibrated again. When other phases are monitored, the system time judgment program is always carried out, and an alarm is given at any time when an abnormality occurs.
Referring to fig. 1 to 4, the universal oscillograph is provided with a switching circuit 5, and the switching circuit 5 is connected with the current testing part 2 and the voltage testing part 3, and is used for automatically adjusting an alternating current test or a direct current test and adjusting the test type of the processing CPU 1; the switching circuit 5 monitors the signal output by the current testing part 2 or the voltage testing part 3, and matches the test type of the processing CPU1, so as to adjust the test class of the processing CPU1 to match the test type of the processing CPU1, thereby realizing the adaptability matching of the current test and the voltage test.
In addition, the universal oscillometer can use the meter pen 31 to measure the resistance, the voltage is tested before the measurement, and when the voltage is greater than the set value, the switching circuit 5 stays on the voltage measurement and is not switched to the resistance measurement.
When the gear of the universal oscilloscope is in a resistance gear and a capacitance gear, the universal oscilloscope firstly measures the voltage U1 at two ends of a measured resistor, when U1 is larger than a set value, the switching circuit 5 stays on the measuring voltage, cannot be switched to the resistor measurement, and gives out an acousto-optic alarm, the display outputs an interference voltage value and an interference voltage waveform, and prompts that the voltage is too high, the resistor cannot be directly tested, if the test is needed, the current of the resistor cannot be tested by using the clamp meter current probe 21, and active elements such as a voltage source and a current source are ensured not to be arranged at two ends of the test element, and at the moment, if the current probe has input, parameters such as the resistor, the capacitor, the inductor and the like of the resistor can be calculated according to the. When the U1 is smaller than the set value, the relay of the switching circuit 5 is closed, the resistance/capacitance measurement is automatically switched to, and after the resistance/capacitance measurement is finished, the universal oscilloscope is automatically switched to the voltage measurement. The self-protection of the universal oscilloscope can be ensured by detecting whether the voltage on the end of the tested resistor is in the safety range of the detection circuit.
When the voltage U1 is detected to be a direct current value, the direct current clamp meter with the proper gear is prompted to be adopted. When the alternating current amount of the voltage U1 is detected to exist and is larger than a set value, the alternating current clamp meter with the proper gear is prompted to be adopted, and the direction of the clamp meter is prompted to be noticed.
When the voltage U1 is detected to be less than the set value, the range adaptive resistance gear is switched to (shown in figure 5): the standard resistor R0 is connected in series with the resistor Rx to be measured and then is connected between the reference voltage V + and COM of the reference table. And V +, Vref +, IN-and COM are connected IN pairs, the reference voltage V + of the reference meter is used for supplying power to R0 and Rx, the resistance Rx to be measured can be calculated through voltage division calculation, and the measured resistance is displayed through an LCD. Because the resistance is measured according to the principle of the series resistor (R0), the R0 is ensured to be high-resistance in design, namely the output of the universal oscilloscope is ensured to be in a high-resistance output state.
The switching circuit 5 is provided with a judgment part which collects signals output by the current test part 2 or the voltage test part 3 and judges whether the signals output by the current test part 2 or the voltage test part 3 exceed corresponding threshold values.
In addition, the universal oscillograph is provided with an early warning part, the early warning part is connected with the judging part and warns based on the signal of the judging part, so that a user is reminded to adjust, and the accurate test of the universal oscillograph is facilitated.
In the using process of the universal oscillograph, the voltage measurement is defaulted, the high-resistance output, the high-speed automatic range switching and the voltage automatic detection protection of the resistance measurement are realized; when the gear setting of the universal oscilloscope is wrong, the error information can be displayed, and acousto-optic alarm is provided; the measurement is provided with self-protection and protection of the tested device.
The universal oscillometer is provided with an interference display function and displays the resistance test result in a waveform mode, so that a tester can observe whether the test resistance has interference or not in real time.
And the universal oscillograph has a vector monitoring function, can mark the voltage quantity of the tested current, and judges whether the phase of the tested current and the voltage are opposite or not according to the set reference voltage and the set reference current phase.
The universal oscillometer is provided with a system frequency automatic judging function, an electric power system fault judging function and a measuring range self-adapting function, wherein a standard resistor R0 is connected in series with a resistor Rx to be measured and then is connected between the reference voltage V + and COM of the reference meter. And V +, Vref +, IN-and COM are connected IN pairs, the reference voltage V + of the reference meter is used for supplying power to R0 and Rx, the resistance Rx to be measured can be calculated through voltage division calculation, and the measured resistance is displayed through an LCD. Since the resistance is measured by the principle of the series resistor (R0), the R0 is ensured to be high-resistance in design, namely, the output of the multimeter is ensured to be in a high-resistance output state.
According to the technical scheme, the embodiment of the invention at least has the following advantages and positive effects:
in the universal oscillograph of the embodiment of the invention, a current testing part 2 is electrically connected with a processing CPU1 and is used for measuring alternating current and direct current, and a clamp meter current probe 21 is arranged on the current testing part 2; the voltage testing part 3 is electrically connected with the CPU1 and is used for measuring AC/DC voltage, and the voltage testing part 3 is provided with a meter pen 31; the root of the gauge pen 31 is different from the root of the clamp meter current probe 21, so that the root of the gauge pen 31 and the root of the clamp meter current probe 21 clamp the corresponding object to be tested; the root of the meter pen 31 is different from the root of the clamp meter current probe 21, so that the butt joint error between the root of the meter pen 31 and the root of the clamp meter current probe 21 can be effectively avoided, the physical isolation of current measurement and voltage measurement is realized, the alternating current and direct current voltage and the alternating current and direct current of the universal wave indicator are automatically switched through the internal processing CPU1, the step of frequent gear switching can be omitted, and meanwhile, the occurrence of artificial measurement error or protection maloperation caused by incorrect gear selection is effectively avoided; synchronously displaying the tested voltage waveform, current waveform, resistance waveform or phase on the LCD screen; the resistance measurement uses the meter pen of the voltage testing part 3, but the object to be tested is firstly detected to be not electrified and then is switched to the resistance measurement, so that the condition that the gear error of a conventional multimeter causes protection misoperation is avoided.
While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (14)
1. A universal oscillograph, comprising:
a housing;
the processing CPU, the display LCD and the buzzer are arranged in the shell;
a current testing part which is electrically connected with the processing CPU and is used for measuring current; a current probe of a clamp meter is arranged on the current testing part;
a voltage testing part which is electrically connected with the processing CPU and is used for measuring voltage; the voltage testing part is provided with a meter pen, and the meter pen and the clamp meter current probe are arranged at intervals; the root of the meter pen is different from the root of the current probe of the clamp meter.
2. The universal oscillograph according to claim 1, wherein said clamp current probes are of a plurality of types, and wherein said clamp current probes have different accuracies and are connectable to said current test portion.
3. The universal oscillograph according to claim 1, further comprising a shift control relay connected to said processing CPU and controlling said current test section and said voltage test section to adjust the test range of said processing CPU and to adapt said current test section and said voltage test section to the test range of said processing CPU.
4. The universal oscillograph according to claim 3, wherein said gear control relay has a signal channel and a display screen connected to said signal channel, said signal channel isolating, amplifying and filtering the signal outputted from said current test portion or said voltage test portion for outputting to said display screen for displaying.
5. The universal oscillograph according to claim 3, further comprising a monitoring unit for testing the phase, wherein the monitoring unit is connected to the gear control relay and records the signal outputted from the gear control relay to determine the phase angle change of the object.
6. The universal oscillograph according to claim 3, wherein the shift control relay adjusts the shift position, and when the shift position is adjusted to the phase test position, the reference voltage/reference current is prompted to be switched in, and the corresponding phase is adjusted.
7. The universal oscillograph according to claim 6, wherein the gear control relay adjusts the gear, the processing CPU enters a voltage measurement process, a current measurement process, a resistance measurement process, a capacitance measurement process, an inductance measurement process or a phase measurement process, and the corresponding measurement channel isolates, amplifies and filters the measurement parameter signal.
8. The universal oscillograph according to claim 7, wherein the universal oscillograph has a switching circuit for connecting the current test portion and the voltage test portion to automatically adjust an AC test or a DC test;
the switching circuit monitors the signal output by the current testing part or the voltage testing part and matches the testing type of the processing CPU.
9. The universal oscillograph according to claim 7, wherein the universal oscillograph can be used for resistance measurement by using a stylus, before the resistance measurement, the interference voltage is measured, and when the interference voltage is greater than a set value, the switching circuit stays on the voltage measurement and does not switch to the resistance measurement.
10. The universal oscillograph according to claim 7, wherein the switching circuit has a determining portion for collecting the signal outputted from the current testing portion or the voltage testing portion and determining whether the signal outputted from the current testing portion or the voltage testing portion exceeds a corresponding threshold.
11. The universal oscillometer according to claim 7, wherein said universal oscillometer has an interference display function for displaying the test result of the resistor in a waveform mode, so that the tester can observe whether the resistor is interfered in real time.
12. The universal oscillograph according to claim 7, wherein the universal oscillograph has an early warning portion, which is connected to the determining portion and warns based on the signal of the determining portion.
13. The universal oscillograph according to claim 7, wherein the universal oscillograph has a vector monitoring function, which can mark the voltage magnitude of the measured current and determine the phase of the measured current and voltage and the reverse direction of the current and voltage according to the set reference voltage and reference current phase.
14. The universal oscillometer according to claim 7, wherein the universal oscillometer has a system frequency automatic judging function, a power system fault judging function and a range adaptive function.
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| CN202011430459.7A CN112557722A (en) | 2020-12-07 | 2020-12-07 | Universal oscillograph |
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| CN202011430459.7A CN112557722A (en) | 2020-12-07 | 2020-12-07 | Universal oscillograph |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113589012A (en) * | 2021-07-29 | 2021-11-02 | 厦门凤凰创壹软件有限公司 | Intelligent oscillograph capable of measuring three-dimensional virtual simulation circuit |
| CN113917203A (en) * | 2021-09-29 | 2022-01-11 | 重庆电子工程职业学院 | Portable waveform test pen |
| CN114062744A (en) * | 2021-11-12 | 2022-02-18 | 沈阳铁路信号有限责任公司 | Protection circuit and method of resistance measurement circuit |
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| CN113589012A (en) * | 2021-07-29 | 2021-11-02 | 厦门凤凰创壹软件有限公司 | Intelligent oscillograph capable of measuring three-dimensional virtual simulation circuit |
| CN113589012B (en) * | 2021-07-29 | 2024-04-16 | 厦门凤凰创壹软件有限公司 | Intelligent oscillometer capable of measuring three-dimensional virtual simulation circuit |
| CN113917203A (en) * | 2021-09-29 | 2022-01-11 | 重庆电子工程职业学院 | Portable waveform test pen |
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| CN114062744B (en) * | 2021-11-12 | 2023-02-10 | 沈阳铁路信号有限责任公司 | Protection circuit and method of resistance measurement circuit |
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