CN1900733A - Current meter correcting system - Google Patents
Current meter correcting system Download PDFInfo
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- CN1900733A CN1900733A CN 200510036145 CN200510036145A CN1900733A CN 1900733 A CN1900733 A CN 1900733A CN 200510036145 CN200510036145 CN 200510036145 CN 200510036145 A CN200510036145 A CN 200510036145A CN 1900733 A CN1900733 A CN 1900733A
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- power supply
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Abstract
The calibration system includes a power supply, a standard amperemeter, and a current meter to be calibrated. The system also includes a fixture for current measurement. The said fixture, power supply, the standard amperemeter, and current meter to be calibrated are connected in series. The invention can reduces variation range of current provided by the power supply so as to raise precision of calibrating current meter.
Description
[technical field]
The present invention relates to a kind of current meter correcting system, refer to a kind of system that improves calibration accuracy by the fluctuation range that reduces electric current that power supply provides especially.
[technical background]
In testing engineering, often relate to precision calibration problem to measurement instrument, the utilization reometer is measured before the electric current, just need utilize current meter correcting system that its precision is calibrated, be about to a standard electric flowmeter and institute's calibration current table series connection back connecting system, then both readings and judging within the scope whether measuring accuracy of reometer in the industry cycle allow relatively.
In the reometer calibration process, additional power source is normally obtained by rectifying and wave-filtering by alternating current, therefore, the voltage that described additional power source provided itself has certain fluctuation (provides 50A with interior electric current, its voltage noise is about 10～20mV usually, generally raise and increase progressively) with voltage, at this moment, electric current in the described current meter correcting system then presents certain fluctuation thereupon, people can only estimate by reometer and read a value with fluctuation range, get its average then, but can't obtain the exact current value, so the big or small degree of electric current that power supply the provides electric current of reometer (promptly by) fluctuation range certainly will become the immediate cause that influences the reometer calibration accuracy.
In above-mentioned reometer calibration process, because the input internal resistance of standard electric flowmeter is less, generally the internal resistance at 0～200A, 0～20A, 0～5A gear is respectively 0.001 Ω, 0.01 Ω, 0.1 Ω, and the all-in resistance of the internal resistance of reometer, lead and the internal resistance of source is usually about 0.02 Ω.Its current measurement fluction analysis is as shown in table 1:
Table 1 current measurement fluction analysis
| Electric current that power supply provides | The line electricity resistance | Line scan pickup coil side voltage | The noise scope | The fluctuating range scope |
| I＝5A | 0.12Ω | 0.6V | 9.5mV～10.5mV | 0.080A～0.087A |
| I＝10A | 0.03Ω | 0.3V | 13.0mV～14.0mV | 0.433A～0.467A |
| I＝25A | 0.02Ω | 0.5V | 16.5mV～17.5mV | 0.825A～0.875A |
| I＝50A | 0.02Ω | 1.0V | 19.5mV～20.5mV | 0.975A～1.025A |
As known from Table 1, in this current meter correcting system the current value fluctuation range of surveying bigger, and increase gradually with the increase of survey electric current.Therefore, the fluctuation range that reduces electric current that power supply provides in the described current meter correcting system then becomes a kind of effective method that improves the reometer calibration accuracy.
[summary of the invention]
In view of above technology contents, be necessary to provide a kind of current meter correcting system that can reduce the fluctuation range of electric current that power supply provides, to improve the reometer calibration accuracy.
A kind of current meter correcting system, comprise a power supply, a standard electric flowmeter and a reometer to be calibrated, wherein, described current meter correcting system also comprises a current measurement tool in order to the fluctuation range that reduces electric current that power supply provides, and described current measurement tool is connected mutually with described power supply, described standard electric flowmeter, described reometer to be measured.
Described current measurement tool comprises some high-power divider resistances and some low tension switches, described high-power divider resistance is in parallel mutually, described low tension switch inserts between the described high-power divider resistance parallel with one another, described low tension switch is selected suitable resistance in order to the electric current that provides according to power supply, reaches the purpose of the fluctuation range that reduces electric current that power supply provides.
Beneficial effect of the present invention has been to improve the measurement environment of current meter correcting system, can reduce the fluctuation range of electric current that power supply provides, and has improved the reometer calibration accuracy.
[description of drawings]
Fig. 1 is the current meter correcting system block diagram of preferred embodiment of the present invention;
Fig. 2 is the circuit connection diagram of current measurement tool among Fig. 1.
[embodiment]
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Consult Fig. 1, a kind of current meter correcting system comprises power supply 1, standard electric flowmeter 2, current measurement tool 3 and reometer to be calibrated 4, described power supply 1, standard electric flowmeter 2, current measurement tool 3 and reometer to be calibrated 5 are connected in series mutually, and described current measurement tool 3 is in order to reduce the fluctuation range of electric current that power supply provides.
Consult Fig. 2, described current measurement tool 3 comprises some high-power divider resistance R1, R2, R3 ... R9, R10 and some key operated switch K1, K2, K3, described high-power divider resistance R1, R2, R3 ... R9, R10 all is that resistance is 1.25 Ω, rated power is the large power winding japanning resistance of 30W, described key operated switch K1, K2, K3 is that rated current is the low tension switch of 200A, described high-power divider resistance R1, R2, R3 ... R9, R10 inserts in the described current meter correcting system back parallel with one another, described key operated switch K1, K2, K3 inserts between the described high-power resistance parallel with one another, in order in system, to select to insert the quantity of resistance in the described current meter correcting system according to electric current that power supply provides, to reduce the fluctuation range of electric current that power supply is provided, the selection of resistance value is as shown in table 2 in the embodiment of the invention:
The selection of resistance value in table 2 system
| Electric current that power supply provides | Selected resistance value | Each resistance institute wasted work rate | The state of switch |
| 0～5A | 1.250Ω | 0～31.20W | K1, K2, K3 all disconnect |
| 5A～10A | 0.625Ω | 7.80W～31.25W | K1 closure, K2, K3 all disconnect |
| 10A～25A | 0.250Ω | 5.00W～31.24W | K1, K2 closure, K3 disconnects |
| 25A～50A | 0.125Ω | 7.81W～31.25W | K1, K2, K3 are all closed |
Select the resistance value of connecting system according to table 2, the fluctuation range of electric current that power supply provides is then corresponding to be reduced, power taking electric current that the source provides is 5A, 10A, 25A, 50A respectively, in the then described current meter correcting system, and the fluctuating range scope such as the table 3 of electric current that power supply provides:
The selection of table 3 resistance value and corresponding fluction analysis
| Electric current that power supply provides | The line electricity resistance | Line scan pickup coil side voltage | The noise scope | The fluctuating range scope |
| I＝5A | 1.250+0.12＝1.370Ω | 6.40V | 9.5mV～10.5mV | 0.007A～0.008A |
| I＝10A | 0.625+0.03＝0.655Ω | 6.55V | 13.0mV～14.0mV | 0.020A～0.021A |
| I＝25A | 0.250+0.02＝0.270Ω | 6.75V | 16.5mV～17.5mV | 0.060A～0.065A |
| I＝50A | 0.125+0.02＝0.145Ω | 6.25V | 19.5mV～20.5mV | 0.135A～0.141A |
Claims (9)
1. current meter correcting system, comprise a power supply, a standard electric flowmeter and a reometer to be calibrated, it is characterized in that: described current meter correcting system also comprises a current measurement tool in order to the fluctuation range that reduces electric current that power supply provides, and described current measurement tool is connected mutually with described power supply, described standard electric flowmeter, described reometer to be measured.
2. current meter correcting system according to claim 1, it is characterized in that: described current measurement tool comprises some high-power divider resistances and some low tension switches.
3. as current meter correcting system as described in the claim 2, it is characterized in that: described high-power divider resistance is parallel with one another, described low tension switch inserts between the described high-power divider resistance parallel with one another, and described low tension switch is in order to select to insert the number of resistance in the described current meter correcting system according to electric current that power supply provides.
4. current meter correcting system as claimed in claim 2 is characterized in that: described divider resistance all is that specification is the coiling japanning resistance of 1.25 Ω, 30W.
5. current meter correcting system as claimed in claim 2 is characterized in that: the rated current of described low tension switch is 200A.
6. current meter correcting system as claimed in claim 2 is characterized in that: when electric current that power supply provides is 0～5A, be 1.25 Ω by controlling the resistance that each described low tension switch makes the described high-power divider resistance of connecting system.
7. current meter correcting system as claimed in claim 2 is characterized in that: when electric current that power supply provides is 5A～10A, be 0.625 Ω by controlling the resistance that each described low tension switch makes the described high-power divider resistance of connecting system.
8. current meter correcting system as claimed in claim 2 is characterized in that: when electric current that power supply provides is 10～25A, be 0.25 Ω by controlling the resistance that each described low tension switch makes the described high-power divider resistance of connecting system.
9. current meter correcting system as claimed in claim 2 is characterized in that: when electric current that power supply provides is 25～50A, be 0.125 Ω by controlling the resistance that each described low tension switch makes the described high-power divider resistance of connecting system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510036145 CN1900733A (en) | 2005-07-22 | 2005-07-22 | Current meter correcting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510036145 CN1900733A (en) | 2005-07-22 | 2005-07-22 | Current meter correcting system |
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|---|---|
| CN1900733A true CN1900733A (en) | 2007-01-24 |
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| CN 200510036145 Pending CN1900733A (en) | 2005-07-22 | 2005-07-22 | Current meter correcting system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279377A (en) * | 2011-07-05 | 2011-12-14 | 江苏东方航天校准检测有限公司 | Measuring device and method for input characteristics of active direct current voltage measuring circuit or instrument |
| CN103901382A (en) * | 2014-03-26 | 2014-07-02 | 孙家林 | Calibration detection device for time ampere meter |
| US20220413588A1 (en) * | 2020-03-19 | 2022-12-29 | Shanghai Ncatest Technologies Co., Ltd. | Current calibaration device and cureent calibaration method for power supply channel in test system thereof |
-
2005
- 2005-07-22 CN CN 200510036145 patent/CN1900733A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279377A (en) * | 2011-07-05 | 2011-12-14 | 江苏东方航天校准检测有限公司 | Measuring device and method for input characteristics of active direct current voltage measuring circuit or instrument |
| CN103901382A (en) * | 2014-03-26 | 2014-07-02 | 孙家林 | Calibration detection device for time ampere meter |
| CN103901382B (en) * | 2014-03-26 | 2016-07-06 | 孙家林 | A kind of calibration detection apparatus of time current table |
| US20220413588A1 (en) * | 2020-03-19 | 2022-12-29 | Shanghai Ncatest Technologies Co., Ltd. | Current calibaration device and cureent calibaration method for power supply channel in test system thereof |
| US11971770B2 (en) * | 2020-03-19 | 2024-04-30 | Shanghai Ncatest Technologies Co., Ltd. | Current calibration device and cureent calibration method for power supply channel in test system thereof |
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