CN1048555C - L, C testing circuit and multi-parameter measurer thereof - Google Patents
L, C testing circuit and multi-parameter measurer thereof Download PDFInfo
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- CN1048555C CN1048555C CN 93106401 CN93106401A CN1048555C CN 1048555 C CN1048555 C CN 1048555C CN 93106401 CN93106401 CN 93106401 CN 93106401 A CN93106401 A CN 93106401A CN 1048555 C CN1048555 C CN 1048555C
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Abstract
The present invention belongs to the technical field of detection of electron and electric basic parameters. The present invention provides an inductance and capacitance testing circuit which is composed of an oscillator, a frequency adjustment circuit, a calibration precision inductance group with different limit of quantification, a capacitance group, a plurality of converting switches and a pointer type. The circuit and a pressurization and insulation resistance testing circuit which is composed of a high pressure generator and a current limiting resistor combine a multi-parameter detecting instrument. The instrument has the advantages of multiple use of one instrument, compact structure, portability, convenient operation, direct reading of a test result, high cost performance, etc. The present invention can be widely used for electronic industry, telecommunication industry, electric industry, electric power industry, electric appliance industry, motor industry, radio industry, household appliance maintenance industry, etc.
Description
The invention belongs to electronics, electric parameter detection technique field, particularly to the design of inductance, capacitive detection circuit and the making field of multi-parameters test instrument.
To electronic devices and components, the inductance value of electron device part, it is a basic parameter detecting job that capacitance is accurately measured.At present, generally use electric bridge or Q table to detect inductance, electric capacity, the testing operation is cumbersome, complicated, wastes time and energy; With ordinary numbers inductance, capacity measurement instrument, can not regulate with the duty frequency adapting again.
The objective of the invention is to overcome the weak point of above-mentioned prior art, design a kind of comparison expression multirange inductance, capacitive detection circuit, and provide a kind of practical multi-parameters test instrument that adopts this testing circuit to combine, it is many to have test function, compact conformation, carry, easy to operate, directly perceived, plurality of advantages such as ratio of performance to price height.
The present invention designs a kind of comparison expression, the inductance testing circuit of full scale calibration, the circuit that it is characterized in that comprising oscillator and the waveform that this oscillator produces is carried out frequency adjustment, the calibration circuit of forming by the indicator of the accurate inductive bank series connection with it of calibration of difference amount limit, throw the coupled switch group by testing circuit and hilted broadsword that the measured piece jack is connected with said indicator more, each ingredient of single-pole double-throw switch (SPDT), said frequency adjustment circuit is made up of volume limit oscillating capacitance group and adjustable resistance, said oscillating capacitance group is corresponding one by one with the accurate inductive bank of calibration, throw coupled switch group by said two groups of hilted broadswords more and be connected in oscillator and the calibration circuit, said measured piece jack and the accurate inductance of calibration are realized the switching of said calibration circuit and testing circuit by said single-pole double-throw switch (SPDT).
Inductance testing circuit principle of work of the present invention is described below in conjunction with shown in Figure 1: it is the electric current of f that oscillator I produces frequency, by the output of 6 ends, through K switch
1-2Meet 1 end and standard inductance group L
1, L
2... the sense Ln that rations the power supply of the maximum among the .Ln links to each other the Ln other end and K switch
2-1Connect 1 end and connect 7 ends (E-) of oscillator I behind indicator III, resistance R is also passed through in the output of 6 ends
2Be communicated with external power supply is anodal, regulate adjustable resistance W and change oscillation frequency, make indication aim at full scale value, this frequency is as the frequency of operation of this range Cln.Work as K switch
2-1Connect measured piece socket CL
1, L
2The time, can detect components and parts inductance value to be measured, when components and parts inductance value to be measured during much smaller than Ln, but gear shift, promptly recalibrate the full scale value of indicator III with said method, (this moment, oscillating capacitance was by coupled switch K to make indicator indicate the range ability of another standard inductance
1-1Gear shift makes f
LChange into F
L1, regulate adjustable resistance W again and make indicator III aim at full scale value, f
L1Test job frequency for the gear shift range.) up to finding out the inductance value that the best range ability of tested components and parts can be read tested components and parts.
The present invention designs a kind of comparison expression, the capacitive detection circuit of full scale calibration, the circuit that it is characterized in that comprising oscillator and the waveform that this oscillator produces is carried out frequency adjustment, the calibration circuit of forming by the accurate capacitance group of the calibration indicator in parallel of difference amount limit with it, throw the coupled switch group by testing circuit and hilted broadsword that the measured piece jack is in parallel with said indicator more, each ingredient of single-pole double-throw switch (SPDT), said frequency adjustment circuit is made up of volume limit oscillating capacitance group and adjustable resistance, said oscillating capacitance group is corresponding one by one with the accurate capacitance group of calibration, throw the coupled switch group by said two groups of hilted broadswords is connected in oscillator and the calibration circuit more, said measured piece jack with the calibration accurate electric capacity by said single-pole double-throw switch (SPDT) changing-over, the switching of promptly said calibration circuit and testing circuit.
Capacitive detection circuit principle of work of the present invention is described below in conjunction with shown in Figure 2: it is the electric current of f that oscillator I produces frequency, by the output of 6 ends, through K switch
2-1Meet 1 end and standard capacitance group C12, the maximum among the C13....Cln is rationed the power supply and is held Cln and link to each other the Cln other end and K switch
1-2Connect and is communicated with through resistance R 2 and external power supply are anodal, adjusting adjustable resistance W change oscillation frequency makes with the pointer of the indicator III of calibration capacitance parallel connection and aims at full scale value, and this frequency is as the frequency of operation of this range Cln.When K switch 2-1 connects measured piece socket CL
1, CL
2Can detect components and parts capacitance to be measured, when components and parts capacitance to be measured is far smaller than Cln, but gear shift, promptly recalibrate indicator III full scale value with said method, (this moment, oscillating capacitance was by coupled switch K to make indicator indicate the range ability of another standard capacitance
1-1Also gear shift makes f
cChange into f
C1, regulate adjustable resistance W again and make indicator III aim at full scale value, f
C1Test job frequency for the gearshift range.) up to finding out tested components and parts optimum range, read the capacitance of tested components and parts.
The invention provides the above-mentioned inductance of a kind of employing, the practical inductance that capacitive detection circuit combines, the capacity measurement instrument, the circuit that it is characterized in that comprising oscillator and the waveform that this oscillator produces is carried out frequency adjustment, connect with the accurate inductive bank of the calibration of different amount limits respectively by switch by the indicator that pointer header and rectification circuit thereof are formed, the calibration circuit that composes in parallel with the accurate capacitance group of the calibration of different amounts limit, the testing circuit of forming by measured piece jack and said indicator, and hilted broadsword is thrown the coupled switch group more, each ingredient of single-pole double-throw switch (SPDT), said frequency adjustment circuit is made up of volume limit oscillating capacitance group and adjustable resistance, said oscillating capacitance group is corresponding one by one respectively with accurate inductive bank of calibration and capacitance group, throw the coupled switch group by said two groups of hilted broadswords is connected in oscillator and the calibration circuit more, said calibration circuit and testing circuit are realized conversion by said single-pole double-throw switch (SPDT), and said gauge outfit has the range designation of inductance value and capacitance simultaneously.
The above-mentioned inductance of the present invention, capacitance detecting instrument also can be utilized easily and throw switch connection DC break down voltage testing circuit more, the testing circuit of insulation resistance testing circuit and other basic electronics, electric parameter, as: transistor DC parameters test and accurate function of multimeter circuit.Make a measuring instrument realize the multiparameter measuring ability.Reduce cost greatly, use, carry simple and convenient.
Brief Description Of Drawings
The inductance testing circuit schematic diagram that Fig. 1 designs for the present invention
The capacitive detection circuit schematic diagram that Fig. 2 designs for the present invention
The inductance that Fig. 3 designs for the present invention, capacity measurement appliance circuit composition diagram
Fig. 4 is the embodiment general illustration of a kind of multi-parameters test instrument provided by the invention
The invention provides a kind of realization and detect inductance, electric capacity simultaneously, DC break down voltage, the multi-functional multi-parameters test instrument of insulation resistance embodiment, its main assembly is as shown in Figure 4.Be described in detail as follows in conjunction with the accompanying drawings:
Present embodiment is made up of inductance, capacitive detection circuit and withstand voltage, insulation resistance testing circuit two parts.
1, inductance, capacitive detection circuit: its composition is identical with Fig. 3, wherein calibrates accurate capacitance group C
12-C
17Be the electric capacity composition that six electric capacitys are respectively 25pf, 100pf, 1000pf, 0.01 μ f, 0.1 μ f, 1 μ f, calibrate accurate inductive bank L
1-L
5Be the inductance composition that 5 inductance values are respectively 10 μ H, 100 μ H, 1mH, 10mH, 100mH, oscillating capacitance group C
1-C
11With the accurate electric capacity of above-mentioned calibration, inductive bank is corresponding one by one.Guarantee that many groups amount limit value has the frequency of operation of each group corresponding, adapt with different duty, and direct reading, easy for operation.
2. withstand voltage, insulation resistance testing circuit: it is by a high pressure generator II, current-limiting resistance R3 switch K
3-2, K
3-3Resistance test jack C, B, insulation resistance detects jack M
1, M
2(extracting shorting stub L) is by R
3, R
4Form with the monitoring voltage table of gauge outfit M combination.Wherein the input end 1,2 of high pressure generator II is by switch K
3-2With inductance, the shared direct supply E of capacitive detection circuit, its output terminal 3,5 is formed high pressure output.The present embodiment high pressure is output as 3000V, presses output (for example 100V) in 3,4 compositions, and high pressure, middle pressure are by switch K
3-4Realize gearshift, hi-line 5 series connection-current-limiting resistance R
3, the high pressure output current is reduced, the purpose that is not damaged when reaching the tested component testing of protection.On high-voltage output line, detect insulation resistance jack M with two of lead L serial connections
1, M
2, when switch changes megger test into, can extract short-term L after, at M
1, M
2Last insertion insulation resistance rx to be measured.(shorting stub L connects M when outer meeting resistance is 0
1, M
2), the full deflection of insulation gauge outfit is decided to be zero graduation.Voltage is 3000V in the machine.When measured piece inserts M
1, M
2The time, gauge outfit shows insulating resistance value.
Present embodiment is measured all shared pointer header of various parameters, give earlier with standard capacitance, inductance on its pointer surface, insulation resistance is calibrated full scale, and (electric capacity and voltage are shared to calibrate scale, linear graduation), by switch and each circuit communication, can indicate the withstand voltage and insulating resistance value of inductance, electric capacity, components and parts of measured piece.
Present embodiment has a-table-multi-purpose, compact conformation, carry, easy to operate, but the test result direct-reading, plurality of advantages such as ratio of performance to price height.Good application prospects is arranged.
Claims (4)
1. comparison expression, the inductance testing circuit of full scale calibration, the circuit that it is characterized in that comprising oscillator and the waveform that this oscillator produces is carried out frequency adjustment, the calibration circuit of forming by the indicator of the accurate inductive bank series connection with it of calibration of difference amount limit, throw coupled switch group, each ingredient of single-pole double-throw switch (SPDT) by testing circuit and hilted broadsword that the measured piece jack is connected with said indicator more, said frequency adjustment circuit is made up of volume limit oscillating capacitance group and adjustable resistance, realizes many grades of full scale calibrations by adjustable resistance; Said oscillating capacitance group is corresponding one by one with the accurate inductive bank of calibration, throw coupled switch group by said two groups of hilted broadswords more and be connected in oscillator and the calibration circuit, said measured piece jack and the accurate inductance of calibration are realized the switching of said calibration circuit and testing circuit by said single-pole double-throw switch (SPDT); During measurement, the measured value of indicator indication is compared with current full scale shelves, if too small or when surpassing full scale value, then switches to preferred circuit, and the adjusting adjustable resistance is selected suitable range shelves, switches to testing circuit again, and test block is measured.
2. comparison expression, the capacitive detection circuit of full scale calibration, the circuit that it is characterized in that comprising oscillator and the waveform that this oscillator produces is carried out frequency adjustment, the calibration circuit of forming by the accurate capacitance group of the calibration indicator in parallel of difference amount limit with it, throw coupled switch group, each ingredient of single-pole double-throw switch (SPDT) by testing circuit and hilted broadsword that the measured piece jack is in parallel with said indicator more, said frequency adjustment circuit is made up of volume limit oscillating capacitance group and adjustable resistance, realizes many grades of full scale calibrations by adjustable resistance; Said oscillating capacitance group is corresponding one by one with the accurate capacitance group of calibration, throw coupled switch group by said two groups of hilted broadswords more and be connected in oscillator and the calibration circuit, said measured piece jack and the accurate electric capacity of calibration are realized the switching of said calibration circuit and testing circuit by said single-pole double-throw switch (SPDT); During measurement, the measured value of indicator indication is compared with current full scale shelves, if too small or when surpassing full scale value, then switches to preferred circuit, and the adjusting adjustable resistance is selected suitable range shelves, switches to testing circuit again, and test block is measured.
3. one kind is adopted above-mentioned inductance, the multiparameter that capacitive detection circuit combines is surveyed the formula instrument, the circuit that it is characterized in that comprising oscillator and the waveform that this oscillator produces is carried out frequency adjustment, connect with the accurate inductive bank of the calibration of different amount limits respectively by switch by the indicator that pointer header and rectification circuit thereof are formed, the calibration circuit that composes in parallel with the accurate capacitance group of the calibration of different amounts limit, the testing circuit of forming by measured piece jack and said indicator, and hilted broadsword is thrown the coupled switch group more, each ingredient of single-pole double-throw switch (SPDT), said frequency adjustment circuit is made up of volume limit oscillating capacitance group and adjustable resistance, said oscillating capacitance group is corresponding one by one respectively with accurate inductive bank of calibration and capacitance group, throw the coupled switch group by said two groups of hilted broadswords is connected in oscillator and the calibration circuit more, said calibration circuit and testing circuit are realized conversion by said single-pole double-throw switch (SPDT), and said gauge outfit has the range designation of inductance value and capacitance simultaneously.
4. multiparameter as claimed in claim 3 is surveyed the formula instrument, it is characterized in that also comprising withstand voltage, insulation resistance test circuit, this circuit is by a high pressure generator II, current-limiting resistance R
3Switch K
3-2, K
3-3Resistance test jack C, B are by the insulation resistance detection jack M of shorting stub L serial connection
1, M
2, by R
3, R
4Form with the monitoring voltage table of gauge outfit M combination, wherein the input end 1,2 of high pressure generator II is by switch K
3-2With inductance, the shared direct supply E of capacitive detection circuit, its output terminal 3,5 is formed high pressure output, and said hi-line is connected in series a current-limiting resistance R
3And said insulation resistance detects jack M
1, M
2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93106401 CN1048555C (en) | 1993-05-29 | 1993-05-29 | L, C testing circuit and multi-parameter measurer thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93106401 CN1048555C (en) | 1993-05-29 | 1993-05-29 | L, C testing circuit and multi-parameter measurer thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1083221A CN1083221A (en) | 1994-03-02 |
| CN1048555C true CN1048555C (en) | 2000-01-19 |
Family
ID=4986206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93106401 Expired - Fee Related CN1048555C (en) | 1993-05-29 | 1993-05-29 | L, C testing circuit and multi-parameter measurer thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1048555C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102023260A (en) * | 2009-09-18 | 2011-04-20 | Abb技术有限公司 | Method, capacitance meter, computer program and computer program product for improved capacitance measurement |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101819234B (en) * | 2010-04-27 | 2012-05-23 | 中国计量科学研究院 | Device and method for measuring AC mutual induction with compensation method |
| CN102116801B (en) * | 2010-12-30 | 2013-04-10 | 优利德科技(中国)有限公司 | Circuit and device for measuring protective conductor |
| CN105182793B (en) * | 2015-08-12 | 2017-10-24 | 北京航天控制仪器研究所 | A kind of wide speed seamless handover method of multi-parameters test instrument multi-mode |
| CN107561476A (en) * | 2017-08-31 | 2018-01-09 | 广东工业大学 | A kind of method and apparatus of the circuit parameter of calculating CVT equivalent circuits |
| CN108037372A (en) * | 2017-12-04 | 2018-05-15 | 常州市致新精密电子有限公司 | A kind of method with secohmmeter detection component series equivalent capacitance |
| CN108982972A (en) * | 2018-08-22 | 2018-12-11 | 西安飞芯电子科技有限公司 | A kind of micro- inductance measurement method and apparatus |
| CN112034259B (en) * | 2020-08-05 | 2023-05-05 | 国家电网有限公司 | Device and detection method for measuring inductive element based on direct-current voltage |
| CN112578006B (en) * | 2020-12-28 | 2023-03-24 | 盐城师范学院 | Method and device for testing solid-phase reaction system |
-
1993
- 1993-05-29 CN CN 93106401 patent/CN1048555C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102023260A (en) * | 2009-09-18 | 2011-04-20 | Abb技术有限公司 | Method, capacitance meter, computer program and computer program product for improved capacitance measurement |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1083221A (en) | 1994-03-02 |
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