CN202631720U - Small signal calibrator - Google Patents
Small signal calibrator Download PDFInfo
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- CN202631720U CN202631720U CN 201120574763 CN201120574763U CN202631720U CN 202631720 U CN202631720 U CN 202631720U CN 201120574763 CN201120574763 CN 201120574763 CN 201120574763 U CN201120574763 U CN 201120574763U CN 202631720 U CN202631720 U CN 202631720U
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- voltage divider
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- resistance value
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Abstract
Disclosed is a precise small signal calibrator, belonging to the measurement and calibration technology. The small signal calibrator comprises a constant flow source, a voltage divider, and a display instrument, wherein the display instrument is connected with the voltage divider; the constant flow source is connected with the voltage divider; the voltage divider is formed by four mutually and serially connected precise resistors and a heating wire used for temperature control; the precise resistors are made of same material with equal temperature coefficients; the resistance value of the fourth resistor is one thousandth of the sum of the resistance value of the four resistors; the sum of the resistance value of the third and fourth resistors is one hundredth of the sum of the resistance value of the four resistors; and the sum of the resistance value of the second, third, and fourth resistors is one tenth of the sum of the resistance value of the four resistors. The small signal calibrator of the utility model can reach Grade 0.05 of the technical qualification via the design of the voltage divider and the configuration of the heating wire. The small signal calibrator features convenient usage, small error, high accuracy, excellent functional expansibility, and great practical application value.
Description
Technical field
The utility model belongs to the measurement collimation technique, relates to a kind of small-signal prover with degree of precision.
Background technology
Temperature test is widely used in the every field of modern industry, is related to indexs such as material behavior, properties of product because of it, just seems particularly important so it is accurately tested.In temperature (especially high temperature) test, the instrument of joining thermopair is its main means of testing.
Measurement to direct current small voltage (below the 20mV) numerical table mainly contains standard source method and DC potentiometer method.The low electric heating potential difference meter of direct current because of must with supporting uses such as standard cell, galvanometer, use comparatively loaded down with trivial details, inefficiency, higher because of standard cell simultaneously to the conditional request of transporting, be not easy to work on the spot.When doing standard calibrating and join the instrument of thermopair, should carefully calculate the requirement whether its limits of error satisfies the standard of doing with the standard direct voltage source.And the prior standard source, no matter homemade or import all can't reach the accuracy more than 0.005% at the following range of 10mV, also can't carry out the calibration of lower range (below the 20mV) voltage digital table.
Summary of the invention
The purpose of the utility model is: a kind of easy to use, error is little, accuracy is high small-signal prover is provided.
The technical scheme of the utility model is: a kind of small-signal prover; It comprises constant current source, voltage divider and Displaying Meter; Wherein, said Displaying Meter links to each other with voltage divider, and said constant current source is to link to each other with voltage divider; Said voltage divider comprises four resistance of connecting each other and is used for the heater strip of temperature control that said resistance is made up of the resistance wire of same material.Wherein, The resistance of the 4th resistance be four resistances and per mille; Three, the resistance sum of the 4th resistance be four resistances and one of percentage, second, third, the resistance sum of the 4th resistance be four resistances and 1/10th.
The resistance of first resistance, second resistance, the 3rd resistance, the 4th resistance is respectively 90 Europe, 9 Europe, 0.9 Europe and 0.1 Europe.
The connected mode of four resistance in the said voltage divider is taked four-wire system.
The electric current of said constant current source output is between 0-30mA.
Said voltage divider both sides are connected with the short circuit sheet that is used for expanding function.
The beneficial effect of the utility model is: the utility model small-signal prover is through the design of voltage divider; The accurate measurement of small voltage is converted into the accurate measurement of electric current; And the configuration through heater strip, resistance is under certain temperature all the time, reach the effect of constant temperature; Guarantee resistance precision, can reach 0.05 grade technical indicator.Being equipped with the pin-point accuracy dc digital voltmeter again can examine and determine 5 half above dc digital voltmeters of 0.02 grade of 20mV range, can realize the accurate measurement calibration to DC low-voltage table (below the 20mV).And can expand application function through the short circuit sheet, can realize that the calibrating and the calibration of 4～20mA DC ammeter, 0.1 Ω～1000 Ω ohmmeters are had bigger actual application value.
Description of drawings
Fig. 1 is the one-piece construction schematic diagram of the utility model small-signal prover;
Fig. 2 is the structure principle chart of voltage divider,
Wherein, 1-voltage divider, 2-heater strip, 3-Displaying Meter, 4-short circuit sheet, 6-constant current source, 7-first resistance, 8-second resistance, 9-the 3rd resistance, 10-the 4th resistance.
Embodiment
Through specific embodiment the utility model is further specified below:
See also Fig. 1, it is the one-piece construction schematic diagram of the utility model small-signal prover.Said small-signal prover comprises the Displaying Meter of high-precision constant current source, voltage divider and pin-point accuracy grade.Wherein, said Displaying Meter links to each other with voltage divider, the voltage that is used to show.Said constant current source output 0-30mA electric current links to each other with voltage divider.
Please consult Fig. 2 simultaneously, it is the structural representation of voltage divider.Said voltage divider adopts four-wire system (with four terminals definition precision resistance.Have four and can supply with the terminal of measuring connection usefulness: C1, C2 and P1, P2.The former supplies to claim current terminal contact through electric current, and the latter supplies to take out between node voltage and measures and claim the current potential terminal.Take out internodal resistance measurement value R and equal P1, the voltage U between P2 with through C1, the ratio of the electric current I of C2.), comprise 4 each other series connection resistance and be used for the heater strip of temperature control.Wherein, The resistance of the 4th resistance be four resistances and per mille; Three, the resistance sum of the 4th resistance be four resistances and one of percentage, second, third, the resistance sum of the 4th resistance be four resistances and 1/10th.In this embodiment, first resistance, 7 resistances are that 90 Ω, second resistance, 8 resistances are that 9 Ω, the 3rd resistance 9 resistances are that 0.9 Ω, the 4th resistance 10 resistances are 0.1 Ω.Above-mentioned resistance rated power: 0.01W, maximum power value: 0.1W, and the above-mentioned resistance error of indication be not more than ± 0.01%; Resistance year stability be not more than ± 0.005%; During 20 ℃ ± 10 ℃ of environment temperatures, indicating value change be not more than ± 0.001%.In addition,, can eliminate the error that lead-in wire brings, improve accuracy of measurement owing to take four-wire system.Said heater strip is symmetrical set with respect to each resistance, as far as possible around the resistance symmetric offset spread, a stable thermal source is provided, and resistance is under certain temperature all the time, has eliminated the influence that environment temperature is brought resistance.In this embodiment, the technical indicator of this constant current source be stability be not more than ± 0.001%/3 minute.
Said Displaying Meter adopts digital multimeter, its accuracy of measurement: ± (0.005%RD+0.0015%FS) (2V range); ± (0.006%RD+0.002%FS) (20V range); Input impedance: 1000M Ω (2V range), 10M Ω (20V range).
During the actual measurement calibration; The multi-functional small-signal prover of the utility model utilizes the measuring resistance of the DC current of the high constant current source output 0-30mA of short-term stability through series connection; According to voltage divider principle; Rely on the accuracy guarantee of resistance, the accurate measurement of small voltage is converted into the accurate measurement of big voltage.According to Ohm law, resistance ratio is a voltage ratio, and resistance ratio is known, as long as with the bigger ohmically voltage readings of numerical table monitoring resistance, just can know the voltage actual value on the small resistor by inference.
In addition,, then can connect other measurement instruments through the short circuit sheet through connect the short circuit sheet on the voltage divider both sides, thus the expansion of measuring calibration function, the range of application of raising device.
The utility model small-signal prover is through the configuration of voltage divider internal resistance and the setting of heater strip in sum; Can reach 0.05 grade technical indicator, being equipped with the pin-point accuracy dc digital voltmeter can examine and determine 5 half above dc digital voltmeters of 0.02 grade of 20mV range.And, make its functional diversities through design to control panel, can realize that the calibrating and the calibration of DC low-voltage table (below the 20mV), 4～20mA DC ammeter, 0.1 Ω～1000 Ω ohmmeters are had bigger actual application value.
Claims (5)
1. a small-signal prover is characterized in that: comprise constant current source, voltage divider and Displaying Meter, wherein; Said Displaying Meter links to each other with voltage divider, and said constant current source is to link to each other with voltage divider, and said voltage divider comprises four precision resistances of connecting each other and is used for the heater strip of temperature control; Each precision resistance material is identical; Temperature coefficient is identical, wherein, the resistance of the 4th resistance be four resistances and per mille; Three, the resistance sum of the 4th resistance be four resistances and one of percentage, second, third, the resistance sum of the 4th resistance be four resistances and 1/10th.
2. small-signal prover according to claim 1 is characterized in that: the resistance of first resistance, second resistance, the 3rd resistance, the 4th resistance is respectively 90 Europe, 9 Europe, 0.9 Europe and 0.1 Europe.
3. small-signal prover according to claim 2 is characterized in that: the connected mode of four resistance in the said voltage divider is taked four-wire system.
4. small-signal prover according to claim 3 is characterized in that: the electric current of said constant current source output is between 0-30mA.
5. according to each described small-signal prover of claim 1 to 4, it is characterized in that: said voltage divider both sides are connected with the short circuit sheet that is used for expanding function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120574763 CN202631720U (en) | 2011-12-27 | 2011-12-27 | Small signal calibrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120574763 CN202631720U (en) | 2011-12-27 | 2011-12-27 | Small signal calibrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202631720U true CN202631720U (en) | 2012-12-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120574763 Expired - Lifetime CN202631720U (en) | 2011-12-27 | 2011-12-27 | Small signal calibrator |
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| CN (1) | CN202631720U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108427090A (en) * | 2018-04-26 | 2018-08-21 | 武汉磐电科技股份有限公司 | ± 1100kV extra-high voltages double shield automatic constant-temperature direct current standard voltage divider and its application method |
| CN109596154A (en) * | 2018-11-07 | 2019-04-09 | 中国航空工业集团公司西安飞机设计研究所 | The calibration method of 28V/ ON signal for output |
-
2011
- 2011-12-27 CN CN 201120574763 patent/CN202631720U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108427090A (en) * | 2018-04-26 | 2018-08-21 | 武汉磐电科技股份有限公司 | ± 1100kV extra-high voltages double shield automatic constant-temperature direct current standard voltage divider and its application method |
| CN109596154A (en) * | 2018-11-07 | 2019-04-09 | 中国航空工业集团公司西安飞机设计研究所 | The calibration method of 28V/ ON signal for output |
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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 |
Granted publication date: 20121226 |
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| CX01 | Expiry of patent term |