CN112526432A - Metering calibration method of lightning protection element tester - Google Patents
Metering calibration method of lightning protection element tester Download PDFInfo
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- CN112526432A CN112526432A CN202011525059.4A CN202011525059A CN112526432A CN 112526432 A CN112526432 A CN 112526432A CN 202011525059 A CN202011525059 A CN 202011525059A CN 112526432 A CN112526432 A CN 112526432A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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Abstract
The invention discloses a metering calibration method of a lightning protection element tester, which comprises the following steps: s1: the lightning protection element tester is used for testing components such as a piezoresistor and the like, and during work, the output direct current voltage range is 0-2000V, and the direct current range is 0-1000 muA; s2: the voltage terminal distinguishes high-side and low-side outputs; s3: connecting a direct-current high-resistance voltage divider or a digital high-voltage meter at the high end and the low end in parallel, and measuring voltage parameters; s4: and measuring the current value of the lightning protection original tester by using the high-voltage high-resistance box and the digital multimeter. The invention aims at the characteristic that the calibrated equipment is a voltage source, uses the high-resistance value divider or the digital high-voltage meter to measure the voltage, avoids the influence of the internal resistance of the measuring instrument on the voltage measurement value, uses the high-voltage high-resistance resistor to adjust the current of the measuring loop, can simulate the state of the lightning protection element tester in the actual use process, and can protect the whole measuring loop from generating overcurrent.
Description
Technical Field
The invention relates to the technical field of electromagnetic metering calibration, in particular to a metering calibration method of a lightning protection element tester.
Background
When the lightning protection component normally works, the resistance value is infinite, which is equivalent to the disconnection state of a switch component, when lightning surge or overvoltage comes, the lightning protection component is switched on, which is equivalent to the switching off, and overcurrent is discharged to the ground, thereby protecting electrical equipment from being damaged, the existing lightning protection component needs to be used in the production process of the lightning protection component, the output direct current voltage of the existing lightning protection component is generally about 2000V, the existing lightning protection component can not be directly measured by using a digital multimeter, the impedance in the voltage range of the digital multimeter is generally about 1M omega, and the requirement for measuring a high-voltage source is not met.
Disclosure of Invention
The invention aims to provide a metering calibration method of a lightning protection element tester, which has the advantage of measuring a high-voltage source and solves the problems that the output direct-current voltage of the existing lightning protection element tester is generally about 2000V and can not be directly measured by using a digital multimeter, and the impedance of the digital multimeter within the voltage range is generally about 1M omega and can not meet the requirement of measuring the high-voltage source.
In order to achieve the purpose, the invention provides the following technical scheme: a method of metrological calibration of a lightning protection component tester, the method comprising the steps of:
s1: the lightning protection element tester is used for testing components such as a piezoresistor and the like, and during work, the output direct current voltage range is 0-2000V, and the direct current range is 0-1000 muA;
s2: the voltage terminal distinguishes high-side and low-side outputs;
s3: connecting a direct-current high-resistance voltage divider or a digital high-voltage meter at the high end and the low end in parallel, and measuring voltage parameters;
s4: measuring the current value of the lightning protection original element tester by using a high-voltage high-resistance box and a digital multimeter;
s5: during measurement, the high end of the voltage output is connected to the high-voltage high-resistance box;
s6: then the digital multi-meter is switched in, and then the voltage output low end is switched in.
Preferably, the ambient temperature: (20 +/-15) DEG C; relative humidity: 35% -70%; power supply voltage: (220 ± 11) V, frequency: (50. + -. 0.5) Hz; the periphery has no electromagnetic interference which influences the normal work of the calibration system.
Preferably, the extended uncertainty introduced by the standard, the associated equipment, and environmental conditions (k 2) during calibration should be less than 1/3 of the maximum allowable error of the tester.
Preferably, the direct current high-resistance voltage divider should meet the rated output voltage range of the calibrated tester; the accuracy grade of the DC high-resistance voltage divider used in calibration is not lower than the maximum allowable error requirement of the standard voltage divider, when the maximum allowable error of the voltage of a tester to be calibrated is +/-0.5, the maximum allowable error of the DC high-resistance voltage divider is +/-0.1, when the maximum allowable error of the voltage of the tester to be calibrated is +/-1.0, the maximum allowable error of the DC high-resistance voltage divider is +/-0.2, when the maximum allowable error of the voltage of the tester to be calibrated is +/-2.0, the maximum allowable error of the DC high-resistance voltage divider is +/-0.5, the input impedance of a DC digital voltmeter used in calibration is not lower than 10/alpha% times of the output resistance of the output end of the distributed standard voltage divider (d is the accuracy grade value of the distributed standard voltage divider), the maximum allowable error of the DC digital voltmeter is not lower than the maximum allowable error requirement of the DC digital voltmeter, when the maximum allowable error of the voltage of the tester to be calibrated is +/-0.5, the maximum allowable error of the direct current digital voltmeter is +/-0.05, when the maximum allowable error of the voltage of the tester to be calibrated is +/-1.0, the maximum allowable error of the direct current digital voltmeter is +/-0.1, and when the maximum allowable error of the voltage of the tester to be calibrated is +/-2.0, the maximum allowable error of the direct current digital voltmeter is +/-0.2.
Preferably, the DC high-voltage meter should meet the rated output voltage range of the tester to be calibrated, and should ensure that the maximum allowable error of the DC high-voltage meter at each calibration point to be tested is not greater than 1/5 of the maximum allowable error of the tester to be calibrated.
Preferably, the direct current digital ammeter should satisfy the rated output current range of the tester to be calibrated, and the preferred choice of the function of maintaining the extreme current value should ensure that the maximum allowable error of the digital ammeter at each calibration point to be tested is not greater than 1/5 of the maximum allowable error of the tester to be calibrated.
Preferably, the adjustable resistor is used as a load when calibrating the output current to be measured, and the output of the adjustable resistor is required to satisfy a resistance value of formula (1), and the power of the adjustable resistor is not less than the output power to be measured, that is, not less than a required value of formula (2), where formula (1) is R ═ U/I, formula (2) is P ═ UI, and where R is the resistance value of the adjustable resistor and is denoted by Ω, P is the power of the adjustable resistor and is denoted by W, U is the nominal voltage value of the tester to be measured, V is denoted by V, I is the nominal current value of the tester to be measured, and mA is denoted by mA.
Compared with the prior art, the invention has the following beneficial effects:
the invention aims at the characteristic that the calibrated equipment is a voltage source, uses the high-resistance value divider or the digital high-voltage meter to measure the voltage, avoids the influence of the internal resistance of the measuring instrument on the voltage measurement value, uses the high-voltage high-resistance resistor to adjust the current of the measuring loop, can simulate the state of the lightning protection element tester in the actual use process, and can protect the whole measuring loop from generating overcurrent.
Drawings
FIG. 1 is a circuit diagram of DC voltage parameter calibration according to the present invention;
FIG. 2 is a circuit diagram of DC parameter calibration according to the present invention.
Detailed Description
Referring to fig. 1-2, a method for calibrating measurement of a lightning protection device tester includes the following steps:
s1: the lightning protection element tester is used for testing components such as a piezoresistor and the like, and during work, the output direct current voltage range is 0-2000V, and the direct current range is 0-1000 muA;
s2: the voltage terminal distinguishes high-side and low-side outputs;
s3: connecting a direct-current high-resistance voltage divider or a digital high-voltage meter at the high end and the low end in parallel, and measuring voltage parameters;
s4: measuring the current value of the lightning protection original element tester by using a high-voltage high-resistance box and a digital multimeter;
s5: during measurement, the high end of the voltage output is connected to the high-voltage high-resistance box;
s6: then the digital multi-meter is switched in, and then the voltage output low end is switched in.
Ambient temperature: (20 +/-15) DEG C; relative humidity: 35% -70%; power supply voltage: (220 ± 11) V, frequency: (50. + -. 0.5) Hz; the periphery has no electromagnetic interference which influences the normal work of the calibration system.
During calibration, the extended uncertainty introduced by the etalon, associated equipment, environmental conditions, etc. (k 2) should be less than 1/3, the maximum allowable error of the tester.
The DC high resistance value voltage divider should meet the rated output voltage range of the calibrated tester; the accuracy grade of the DC high-resistance voltage divider used in calibration is not lower than the maximum allowable error requirement of the standard voltage divider, when the maximum allowable error of the voltage of a tester to be calibrated is +/-0.5, the maximum allowable error of the DC high-resistance voltage divider is +/-0.1, when the maximum allowable error of the voltage of the tester to be calibrated is +/-1.0, the maximum allowable error of the DC high-resistance voltage divider is +/-0.2, when the maximum allowable error of the voltage of the tester to be calibrated is +/-2.0, the maximum allowable error of the DC high-resistance voltage divider is +/-0.5, the input impedance of a DC digital voltmeter used in calibration is not lower than 10/a% times of the output resistance of the output end of the distributed standard voltage divider (alpha is the accuracy grade value of the distributed standard voltage divider), the maximum allowable error of the DC digital voltmeter is not lower than the maximum allowable error requirement of the DC digital voltmeter, when the maximum allowable error of the voltage of the tester to be calibrated is +/-0.5, the maximum allowable error of the direct current digital voltmeter is +/-0.05, when the maximum allowable error of the voltage of the tester to be calibrated is +/-1.0, the maximum allowable error of the direct current digital voltmeter is +/-0.1, and when the maximum allowable error of the voltage of the tester to be calibrated is +/-2.0, the maximum allowable error of the direct current digital voltmeter is +/-0.2.
The DC high-voltage meter should meet the rated output voltage range of the tester to be calibrated, and should ensure that the maximum allowable error of the DC high-voltage meter at each calibration point to be tested is not more than 1/5 of the maximum allowable error of the tester to be calibrated.
The direct current digital ammeter should satisfy the rated output current range of the tester to be calibrated, and the preference with the current extreme value holding function should ensure that the maximum allowable error of the digital ammeter at each calibration point to be tested is not greater than 1/5 of the maximum allowable error of the tester to be calibrated.
The adjustable resistor is used as a load when the output current to be measured is calibrated, the output of the adjustable resistor is required to satisfy a resistance value of formula (1), and the power of the adjustable resistor is required to be not less than the output power to be measured, that is, not less than a required value of formula (2), wherein formula (1) is R ═ U/I, formula (2) is P ═ UI, and wherein R is the resistance value of the adjustable resistor, and the symbol is Ω, P is the power of the adjustable resistor, the symbol is W, U is the nominal voltage value of the tester to be calibrated, the symbol is V, I is the nominal current value of the tester to be calibrated, and the symbol is mA.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A metering calibration method of a lightning protection element tester is characterized by comprising the following steps:
s1: the lightning protection element tester is used for testing components such as a piezoresistor and the like, and during work, the output direct current voltage range is 0-2000V, and the direct current range is 0-1000 muA;
s2: the voltage terminal distinguishes high-side and low-side outputs;
s3: connecting a direct-current high-resistance voltage divider or a digital high-voltage meter at the high end and the low end in parallel, and measuring voltage parameters;
s4: measuring the current value of the lightning protection original element tester by using a high-voltage high-resistance box and a digital multimeter;
s5: during measurement, the high end of the voltage output is connected to the high-voltage high-resistance box;
s6: then the digital multi-meter is switched in, and then the voltage output low end is switched in.
2. The metering calibration method of the lightning protection component tester as recited in claim 1, wherein: the ambient temperature is: (20 +/-15) DEG C; relative humidity: 35% -70%; power supply voltage: (220 ± 11) V, frequency: (50. + -. 0.5) Hz; the periphery has no electromagnetic interference which influences the normal work of the calibration system.
3. The metering calibration method of the lightning protection component tester as recited in claim 1, wherein: the extended uncertainty introduced by the etalon, associated equipment, environmental conditions, etc. (k 2) during calibration should be less than 1/3 of the maximum allowable error of the tester.
4. The metering calibration method of the lightning protection component tester as recited in claim 1, wherein: the DC high-resistance voltage divider should meet the rated output voltage range of the calibrated tester; the accuracy grade of the DC high-resistance voltage divider used in calibration is not lower than the maximum allowable error requirement of the standard voltage divider, when the maximum allowable error of the voltage of a tester to be calibrated is +/-0.5, the maximum allowable error of the DC high-resistance voltage divider is +/-0.1, when the maximum allowable error of the voltage of the tester to be calibrated is +/-1.0, the maximum allowable error of the DC high-resistance voltage divider is +/-0.2, when the maximum allowable error of the voltage of the tester to be calibrated is +/-2.0, the maximum allowable error of the DC high-resistance voltage divider is +/-0.5, the input impedance of a DC digital voltmeter used in calibration is not lower than 10/alpha% times of the output resistance of the output end of the distributed standard voltage divider (alpha is the accuracy grade value of the distributed standard voltage divider), the maximum allowable error of the DC digital voltmeter is not lower than the maximum allowable error requirement of the DC digital voltmeter, when the maximum allowable error of the voltage of the tester to be calibrated is +/-0.5, the maximum allowable error of the direct current digital voltmeter is +/-0.05, when the maximum allowable error of the voltage of the tester to be calibrated is +/-1.0, the maximum allowable error of the direct current digital voltmeter is +/-0.1, and when the maximum allowable error of the voltage of the tester to be calibrated is +/-2.0, the maximum allowable error of the direct current digital voltmeter is +/-0.2.
5. The metering calibration method of the lightning protection component tester as recited in claim 1, wherein: the DC high-voltage meter should meet the rated output voltage range of the tester to be calibrated, and should ensure that the maximum allowable error of the DC high-voltage meter at each calibration point to be tested is not more than 1/5 of the maximum allowable error of the tester to be calibrated.
6. The metering calibration method of the lightning protection component tester as recited in claim 1, wherein: the direct current digital ammeter should meet the rated output current range of the tester to be calibrated, the preferential selection of the current extreme value maintaining function is carried out, and the maximum allowable error of the digital ammeter at each calibration point to be tested is not larger than 1/5 of the maximum allowable error of the tester to be calibrated.
7. The metering calibration method of the lightning protection component tester as recited in claim 1, wherein: the adjustable resistor is used as a load when the output current to be tested is calibrated, the adjustable resistor is required to output a resistance value meeting the formula (1), and the power of the adjustable resistor is not less than the output power to be tested, namely not less than the required value of the formula (2), wherein the formula (1) is R ═ U/I, the formula (2) is P ═ UI, and in the formula, R is the resistance value of the adjustable resistor, the symbol is omega, P is the power of the adjustable resistor, the symbol is W, U is the nominal voltage value of the tester to be calibrated, the symbol is V, I is the nominal current value of the tester to be calibrated, and the symbol is mA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011525059.4A CN112526432A (en) | 2020-12-22 | 2020-12-22 | Metering calibration method of lightning protection element tester |
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| CN202011525059.4A CN112526432A (en) | 2020-12-22 | 2020-12-22 | Metering calibration method of lightning protection element tester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113848523A (en) * | 2021-10-21 | 2021-12-28 | 山东省计量科学研究院 | Calibration method and calibration device for pulse type lightning protection element tester |
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2020
- 2020-12-22 CN CN202011525059.4A patent/CN112526432A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113848523A (en) * | 2021-10-21 | 2021-12-28 | 山东省计量科学研究院 | Calibration method and calibration device for pulse type lightning protection element tester |
| CN113848523B (en) * | 2021-10-21 | 2023-07-07 | 山东省计量科学研究院 | Calibration method and calibration device of pulse type lightning protection element tester |
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