CN202110218U - Device for measuring input impedance of active voltage measurement circuit or instrument - Google Patents
Device for measuring input impedance of active voltage measurement circuit or instrument Download PDFInfo
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- CN202110218U CN202110218U CN201120234466XU CN201120234466U CN202110218U CN 202110218 U CN202110218 U CN 202110218U CN 201120234466X U CN201120234466X U CN 201120234466XU CN 201120234466 U CN201120234466 U CN 201120234466U CN 202110218 U CN202110218 U CN 202110218U
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- active voltage
- input impedance
- oscilloscope
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Abstract
The utility model discloses a device for measuring the input impedance of an active voltage measurement circuit or instrument. The device is characterized by including an oscilloscope calibrating device, wherein a signal passage of the oscilloscope calibrating device is connected with a terminal of a piece to be measured. In the prior art, the oscilloscope calibrating device is usually adopted to calibrate technical indexes of the oscilloscope, while in the utility model, the oscilloscope calibrating device is used in the device for measuring the input impedance of the active voltage measurement circuit or the active voltage measurement instrument, so that only the universal oscilloscope calibrating device can be used for measuring the input impedance of the active voltage measurement circuit or the active voltage measurement instrument, and a circuit built by elements is not needed, as a result, the circuit is simple, the operation calculation is simple and convenient, the measuring cost is low, the measurement result is stable and reliable, the accuracy is high, and the measurement efficiency and the measurement accuracy of input impedance of the active voltage measurement circuit or instrument can be remarkably improved.
Description
Technical field
The utility model relates to the input impedance measurement mechanism of a kind of active voltage metering circuit or instrument, belongs to instrument and meter, measurement and control technology field.
Background technology
Active voltage metering circuit or instrument comprise D.C. voltmeter, A.C. voltmeter, measurement voltage divider, oscillograph, measuring amplifier, radio communication comprehensive test instrument, Frequency Response Analysis appearance, modulation meter, measuring receiver, distortion meter, various voltage secondary instrument, voltage amplifier integrated circuit or voltage A/D converter integrated circuit etc.The input impedance of active voltage metering circuit or instrument is active voltage metering circuit or the important meter characteristic of instrument, is the material impact amount that influences active voltage metering circuit or instrument accuracy grade.
The resistance in series indirect method of measurement is adopted in measurement to the input resistance of active dc voltage measurement circuit or instrument in the prior art usually; As shown in Figure 1; Need be with element from taking metering circuit, measuring circuit is complicated, and operational computations is complicated; Circuit leaks serious interference, and the input resistance indeterminacy really even survey not come out.
The bridge circuit method is adopted in the measurement of active AC voltage metering circuit/instrument input impedance usually, and is as shown in Figure 2, equally need be with element from taking metering circuit; Measuring circuit is complicated; Operational computations is complicated, and circuit leaks serious interference, and the input impedance indeterminacy really even survey not come out.
The utility model content
The utility model technical matters to be solved is to overcome defective of the prior art; The input impedance measurement mechanism of a kind of active voltage metering circuit or active voltage surveying instrument is provided; Do not need to measure the input impedance of input resistance, active AC voltage metering circuit or the surveying instrument of active dc voltage measurement circuit or surveying instrument simply and easily from taking metering circuit.
For solving the problems of the technologies described above, the utility model provides the input impedance measurement mechanism of a kind of active voltage metering circuit or instrument, it is characterized in that, comprises an oscilloscope calibrator, and the signalling channel of said oscilloscope calibrator is connected with the terminals of measured piece.
Input end in the terminals of the probe of the signal output channels of said oscilloscope calibrator through oscilloscope calibrator and said measured piece is connected.
Said measured piece is active voltage metering circuit or active voltage surveying instrument.
Said oscilloscope calibrator is made as pull-up resistor and load capacitance function shelves.
Said measured piece is made as the DC coupling input mode.
The beneficial effect that the utility model reached:
Usually adopt each item technical indicator of oscilloscope calibrator calibrated oscilloscope in the prior art; The utility model is used for the input impedance measurement mechanism of active voltage metering circuit or active voltage surveying instrument with oscilloscope calibrator, when measuring the input impedance of active voltage metering circuit or active voltage surveying instrument, only uses all purpose instrument oscilloscope calibrator; Need not with element from taking circuit; Circuit is simple, and operational computations is simple and efficient, and it is low to measure cost; Measurement result is reliable and stable, accuracy is high, significantly improves the efficiency of measurement and the accuracy of measurement of active voltage metering circuit/instrument input impedance.
Description of drawings
Fig. 1 is the input resistance metering circuit synoptic diagram of active dc voltage measurement circuit or instrument in the prior art;
Fig. 2 is active AC voltage metering circuit or an instrument input impedance metering circuit synoptic diagram in the prior art;
Fig. 3 is the active voltage metering circuit of the utility model or the input impedance metering circuit synoptic diagram of instrument.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.Following examples only are used for technical scheme of the present invention more clearly is described, and can not limit protection scope of the present invention with this.
Measure the input impedance (both input resistance and input capacitance) of active voltage metering circuit or instrument with oscilloscope calibrator; Measuring circuit is as shown in Figure 3; Measured piece is started shooting; Oscilloscope calibrator is put pull-up resistor and load capacitance measurement function shelves; On oscilloscope calibrator, measured piece is made as the DC coupling input mode, the signal output channels of the oscilloscope calibrator probe through oscilloscope calibrator is connected with the measured piece input end, oscilloscope calibrator pull-up resistor displayed value is the input resistance of measured piece
R i, the load capacitance displayed value of oscilloscope calibrator is the input capacitance of measured piece
C iWhen making in this way, the output current of oscilloscope calibrator be should check, the output current of oscilloscope calibrator and the input resistance of measured piece guaranteed
R iProduct be no more than the voltage range ultimate value of measured piece, avoid producing overload.When measuring input capacitance, requiring the input resistance of active voltage metering circuit or instrument is high state of value, is generally M Ω magnitude.
With 9500 type oscilloscope calibrators is example, and the input resistance and the input capacitance of 34401A type dc digital voltmeter are measured.Measurement data is following:
34401A type dc digital voltmeter range is made as 1000V; 9500 type oscilloscope calibrator resistance displayed values are 34401A type dc digital voltmeter input resistance value 10.039M Ω, and 9500 type oscilloscope calibrator electric capacity displayed values are 34401A type dc digital voltmeter input capacitance value 40.7pF; 34401A type dc digital voltmeter range is made as 100V; 9500 type oscilloscope calibrator resistance displayed values are 34401A type dc digital voltmeter input resistance value 10.039M Ω, and 9500 type oscilloscope calibrator electric capacity displayed values are 34401A type dc digital voltmeter input capacitance value 40.67pF; 34401A type dc digital voltmeter range is made as 10V; 9500 type oscilloscope calibrator resistance displayed values are 34401A type dc digital voltmeter input resistance value 10.33M Ω, and 9500 type oscilloscope calibrator electric capacity displayed values are 34401A type dc digital voltmeter input capacitance value 39.9pF.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model know-why; Can also make some improvement and distortion, these improvement and distortion also should be regarded as the protection domain of the utility model.
Claims (5)
1. the input impedance measurement mechanism of active voltage metering circuit or instrument is characterized in that comprise an oscilloscope calibrator, the signalling channel of said oscilloscope calibrator is connected with the terminals of measured piece.
2. the input impedance measurement mechanism of active voltage metering circuit according to claim 1 or instrument is characterized in that, the input end in the terminals of the probe of the signal output channels of said oscilloscope calibrator through oscilloscope calibrator and said measured piece is connected.
3. the input impedance measurement mechanism of active voltage metering circuit according to claim 1 or instrument is characterized in that, said measured piece is active voltage metering circuit or active voltage surveying instrument.
4. the input impedance measurement mechanism of active voltage metering circuit according to claim 1 or instrument is characterized in that, said oscilloscope calibrator is made as pull-up resistor and load capacitance function shelves.
5. the input impedance measurement mechanism of active voltage metering circuit according to claim 1 or instrument is characterized in that said measured piece is made as the DC coupling input mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120234466XU CN202110218U (en) | 2011-07-05 | 2011-07-05 | Device for measuring input impedance of active voltage measurement circuit or instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120234466XU CN202110218U (en) | 2011-07-05 | 2011-07-05 | Device for measuring input impedance of active voltage measurement circuit or instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202110218U true CN202110218U (en) | 2012-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120234466XU Expired - Lifetime CN202110218U (en) | 2011-07-05 | 2011-07-05 | Device for measuring input impedance of active voltage measurement circuit or instrument |
Country Status (1)
| Country | Link |
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| CN (1) | CN202110218U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698611A (en) * | 2014-01-10 | 2014-04-02 | 秦辉 | Active network internal resistance measuring instrument |
| CN113325237A (en) * | 2021-05-21 | 2021-08-31 | 中国电子技术标准化研究院 | Radio frequency impedance measuring method |
-
2011
- 2011-07-05 CN CN201120234466XU patent/CN202110218U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698611A (en) * | 2014-01-10 | 2014-04-02 | 秦辉 | Active network internal resistance measuring instrument |
| CN113325237A (en) * | 2021-05-21 | 2021-08-31 | 中国电子技术标准化研究院 | Radio frequency impedance measuring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120111 |