CN202057728U - Wide-range high-precision quick test device for direct-current resistance - Google Patents
Wide-range high-precision quick test device for direct-current resistance Download PDFInfo
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- CN202057728U CN202057728U CN2011200900914U CN201120090091U CN202057728U CN 202057728 U CN202057728 U CN 202057728U CN 2011200900914 U CN2011200900914 U CN 2011200900914U CN 201120090091 U CN201120090091 U CN 201120090091U CN 202057728 U CN202057728 U CN 202057728U
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Abstract
The utility model relates to a wide-range high-precision quick test device for direct-current resistance, which comprises an accumulator charge and discharge module, various direct-current power modules for instruments, a central controller CPU(central processing unit), a programmable constant-current source module, an analog to digital conversion module and a programmable amplifying module. The central controller CPU is connected with a printer, a display, an operating mouse and an RS232 communication module, the programmable constant-current source module is connected with the central controller CPU, and is connected with the programmable amplifying module and the analog to digital conversion module through a calibration resistor respectively, both the analog to digital conversion module and the programmable amplifying module are connected with the central controller CPU, and the calibration resistor is connected with the programmable amplifying module through an output control and interface module. The quick test device guarantees stability of signals, realizes wide range and reduces uncertainty in standard current measurement, and realizes direct-current measurement by supplying power through an electric level. The central controller completes data acquisition, signal processing, constant-current source control, displaying, printing, communication of the mouse and a serial port.
Description
Technical field
The utility model belongs to the electronic product field, concrete relates to a kind of wide-range high precision direct current resistance device for quick testing.
Background technology
The direct current resistance device for quick testing is widely used in the direct current resistance of perceptual equipment such as transformer, motor, mutual inductor and measures, its principal feature is: adopt advanced Switching Power Supply and Technology of Precision Measurement, built-in non-maintaining rechargeable battery, volume is little, and is in light weight.Can under the situation of test site AC-less power, use; Built-in extinguishing arc loop, the automatic extinguishing arc of shutting down, measuring current reaches stationary value fast, and Measuring Time is shortened greatly, is the ideal product that replaces single, double arm electric bridge.
The test of the direct current resistance of Transformer Winding be transformer, motor, mutual inductor behind handing-over, overhaul and change shunting switch, requisite pilot project.Under normal conditions, direct current resistance with traditional method (bridge method and pressure decline method) measuring transformer winding and high-power inductance equipment is a time-consuming job of taking a lot of work, in addition, present resistance test device or be wide range, be little range, measure little range or all can bring big measuring error with a small amount of journey proving installation measurement wide range with the wide range proving installation.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of wide-range high precision direct current resistance device for quick testing that shortens Measuring Time and alleviate tester's work load at above-mentioned prior art.
The utility model is adopted solution to be by the problem of the above-mentioned proposition of solution: a kind of wide-range high precision direct current resistance device for quick testing, include the accumulator cell charging and discharging module, various DC power supplier and central controller CPU that instrument is used, central controller CPU and printer, display, the operation mouse links to each other with the RS232 communication module, it is characterized in that also including the program controlled constant current source module, analog-to-digital conversion module, program control amplification module, the program controlled constant current source module links to each other with central controller CPU, the program controlled constant current source module links to each other with analog to digital conversion with programmable amplifier by calibrated resistance, analog-to-digital conversion module all links to each other with central controller CPU with program control amplification module, and calibrated resistance links to each other with programmable amplifier with interface module by output control simultaneously.
Press such scheme, described program controlled constant current source module adopts high-power IXFH40N30MOS pipe and PID control circuit, realize big electric current constant current source (1A, 5A, 10A).
Press such scheme, described program controlled constant current source module adopts 2272 amplifiers and MAX6225A, and the realization small current constant-current source (500nA, 5uA, 10uA, 100uA, 1mA, 10mA, 100mA).
Press such scheme, described analog-to-digital conversion module adopts ICL7135 high-precision A module, adopts contrast high-precision calibration resistance to sample.
Power supply of the present utility model is a power module independently, for the required various direct currents of instrument (5V, 15V ,-15V, 48V).Discharge protection circuit provides test and finishes, and in the time of need tearing cable open, bleeds off the electric energy that transformer inductance stores, in order to avoid operating personnel are produced harm.Reference voltage base is to stablize accurate reference voltage for the constant current source that produces precision provides.The design needs constant current source of all sizes, and program controlled constant current source is controlled by CPU, produces steady current of all sizes.Printer and RS232 communication provide the output unit of measurement data.Display uses when providing to tester's operating instrument with the operation mouse.Analog to digital conversion and programmable amplifier design at signal of all sizes.Output control provides constant current and voltage signal to measure with interface.
Direct current resistance device for quick testing of the present utility model, the plain existing direct current supply of electricity consumption.
The utility model utilizes various electric current constant current source (500nA, 5uA, the 10uA of tube design stable precision, 100uA, 1mA, 10mA, 100mA, 1A, 5A, 10A etc.), utilize high-precision A and pin-point accuracy sampling resistor image data, by two groups of data of measurement of comparison, analyze with the Error processing supervisor and realize intelligent high precision direct current resistance measurement.
The utility model integrates big or small range, adopts typical four-wire system mensuration, the Stability Design of constant current source, and high-precision A and contrast sampling guarantee signal stabilization, realize wide-range, have improved the uncertainty of measurement standard electric current; The power supply of employing level realizes direct current measurement; Controller is finished data acquisition, signal Processing, constant current source control, demonstration, printing, mouse and serial communication, the utlity model has stable performance, measurement rapidly, volume is small and exquisite, portable, range is big, the measuring accuracy height, characteristics such as data good reproducibility are the ideal devices of equipment direct current resistances such as measuring transformer winding and high-power inductance.
Description of drawings
Fig. 1 is the building block principle figure of direct current resistance device for quick testing.
Embodiment
In order to understand the utility model better, further illustrate content of the present utility model below in conjunction with embodiment, but content of the present utility model not only is confined to following enforcement.
A kind of wide-range high precision of the utility model direct current resistance device for quick testing, mainly include the accumulator cell charging and discharging module, various DC power supplier and central controller CPU that instrument is used, central controller CPU and printer, display, the operation mouse links to each other with the RS232 communication module, also include the program controlled constant current source module, analog-to-digital conversion module, program control amplification module, the program controlled constant current source module links to each other with central controller CPU, the program controlled constant current source module links to each other with analog to digital conversion with programmable amplifier by calibrated resistance, analog-to-digital conversion module all links to each other with central controller CPU with program control amplification module, described analog-to-digital conversion module adopts ICL7135 high-precision A module, adopt contrast high-precision calibration resistance to sample, calibrated resistance links to each other with programmable amplifier with interface module by output control simultaneously.When each modular design making finishes, can carry out assembly and adjustment, its building block principle figure is as shown in Figure 1.
Described program controlled constant current source module adopts high-power IXFH40N30MOS pipe and PID control circuit, realize big electric current constant current source (1A, 5A, 10A).
Described program controlled constant current source module also can adopt 2272 amplifiers and MAX6225A realize small current constant-current source (500nA, 5uA, 10uA, 100uA, 1mA, 10mA, 100mA).
The principle of work of the present utility model and measurement: wide-range direct current resistance high speed tester adopts typical four-wire system mensuration; Stablize the constant current source design of big electric current, guarantee signal stabilization, improve the uncertainty of measurement standard electric current, in the hope of improving the accuracy of measuring resistance (especially low-resistance); Program controlled constant current source, programmable amplifier, analog to digital converter have constituted the main body of metering circuit; Central control unit applies constant a, current with high accuracy for outside load to be measured by the control constant current source, then, the data that obtained (comprising test voltage, current measuring current etc.) are handled in real time by the contrast sampling, obtain the actual resistance value of high precision, pass through liquid crystal display displays.
The concrete measurement range of device of the present utility model is as follows:
The measuring resistance scope of 10A electric current is: 1m Ω-2 Ω, 0.2 class precision;
The scope of the measuring resistance of 5A electric current is: 1m Ω-4 Ω, 0.2 class precision;
The scope of the measuring resistance of 1A electric current is: 10m Ω-20 Ω, 0.2 class precision;
The scope of the measuring resistance of 100mA electric current is: below 10 Ω;
The scope of the measuring resistance of 10mA electric current is: below 100 Ω;
The scope of the measuring resistance of 1mA electric current is: below the 1K Ω;
The scope of the measuring resistance of 100uA electric current is: below the 10K Ω;
The scope of the measuring resistance of 10uA electric current is: below the 100K Ω;
The scope of the measuring resistance of 5uA electric current is: below the 1M Ω;
The scope of the measuring resistance of 500nA electric current is: below the 10M Ω;
The scope of the measuring resistance of 500nA current parallel 10M Ω is: below the 100M Ω.
The above, it only is preferred embodiment of the present utility model, be not that utility model is done any pro forma restriction, every foundation technical spirit of the present utility model all still belongs in the scope of the present utility model any simple modification, equivalent variations and modification that above embodiment did.
Claims (4)
1. wide-range high precision direct current resistance device for quick testing, include the accumulator cell charging and discharging module, various DC power supplier and central controller CPU that instrument is used, central controller CPU and printer, display, the operation mouse links to each other with the RS232 communication module, it is characterized in that also including the program controlled constant current source module, analog-to-digital conversion module, program control amplification module, the program controlled constant current source module links to each other with central controller CPU, the program controlled constant current source module links to each other with analog to digital conversion with programmable amplifier by calibrated resistance, analog-to-digital conversion module all links to each other with central controller CPU with program control amplification module, and calibrated resistance links to each other with programmable amplifier with interface module by output control simultaneously.
2. by the described wide-range high precision of claim 1 direct current resistance device for quick testing, it is characterized in that described program controlled constant current source module adopts high-power IXFH40N30MOS pipe and PID control circuit, realizes big electric current constant current source.
3. by the described wide-range high precision of claim 1 direct current resistance device for quick testing, it is characterized in that described program controlled constant current source module adopts 2272 amplifiers and MAX6225A, realize small current constant-current source.
4. by claim 2 or 3 described wide-range high precision direct current resistance device for quick testing, it is characterized in that described analog-to-digital conversion module adopts ICL7135 high-precision A module, adopt contrast high-precision calibration resistance to sample.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200900914U CN202057728U (en) | 2011-03-31 | 2011-03-31 | Wide-range high-precision quick test device for direct-current resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200900914U CN202057728U (en) | 2011-03-31 | 2011-03-31 | Wide-range high-precision quick test device for direct-current resistance |
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| Publication Number | Publication Date |
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| CN202057728U true CN202057728U (en) | 2011-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011200900914U Expired - Fee Related CN202057728U (en) | 2011-03-31 | 2011-03-31 | Wide-range high-precision quick test device for direct-current resistance |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472307A (en) * | 2013-09-10 | 2013-12-25 | 中国工程物理研究院化工材料研究所 | Computer micro-resistor high-precision testing device based on CPCI |
| CN105403772A (en) * | 2015-10-30 | 2016-03-16 | 芜湖市振华戎科智能科技有限公司 | Transformer DC resistance testing device |
| CN106771632A (en) * | 2016-12-30 | 2017-05-31 | 易瓦特科技股份公司 | Multi-channel DC resistance meter |
| CN106771633A (en) * | 2016-12-30 | 2017-05-31 | 易瓦特科技股份公司 | Hand-held instrument for measuring DC resistance |
| CN108899945A (en) * | 2018-06-20 | 2018-11-27 | 国网江苏省电力有限公司泰州供电分公司 | A kind of intelligent recharge and discharge instrument |
| CN112415253A (en) * | 2020-11-16 | 2021-02-26 | 北京深思数盾科技股份有限公司 | Circuit and system for testing working current of circuit board |
-
2011
- 2011-03-31 CN CN2011200900914U patent/CN202057728U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472307A (en) * | 2013-09-10 | 2013-12-25 | 中国工程物理研究院化工材料研究所 | Computer micro-resistor high-precision testing device based on CPCI |
| CN105403772A (en) * | 2015-10-30 | 2016-03-16 | 芜湖市振华戎科智能科技有限公司 | Transformer DC resistance testing device |
| CN106771632A (en) * | 2016-12-30 | 2017-05-31 | 易瓦特科技股份公司 | Multi-channel DC resistance meter |
| CN106771633A (en) * | 2016-12-30 | 2017-05-31 | 易瓦特科技股份公司 | Hand-held instrument for measuring DC resistance |
| CN108899945A (en) * | 2018-06-20 | 2018-11-27 | 国网江苏省电力有限公司泰州供电分公司 | A kind of intelligent recharge and discharge instrument |
| CN112415253A (en) * | 2020-11-16 | 2021-02-26 | 北京深思数盾科技股份有限公司 | Circuit and system for testing working current of circuit board |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111130 Termination date: 20150331 |
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| EXPY | Termination of patent right or utility model |