Some standard content:
Verification Regulation of DC Digital Ohmmeter
JJG724-1991
Verification Regulation of DC Digital Ohmmeter
Verification Regalation ofWww.bzxZ.net
Tr. C. Tigital Ohanmeher
----+--+-
JJG 724—199]
This calibration standard was approved by the State Technical Supervision Bureau on March 4, 1901, and was implemented from December 1, 1991. Responsible unit: China National Institute of Metrology Drafting unit: China National Institute of Metrology Technical provisions of this standard are interpreted by the drafting unit. Main drafters of this standard:
(Guangdong Institute of Metrology)
Technical requirements
Calibration policy
(1) Stable equipment costs
(2) Calibration environmental conditions
Calibration items
() Frequency detection
() Type detection method
( =) Verification of other items
5. Handling of verification results and validity period
1. Reasons for error
[3] Verification data
Verification record of DC digital ohmmeter
Verification procedure of DC digital ohmmeter
This procedure is used for the verification of newly manufactured, used and repaired DC digital voltmeter (DXM, TM) and semi-automatic multimeter (TM) for measuring direct current ohms. The TXVM is a DC digital ohmmeter. The TXVM first converts the electrical quantity into electrical quantity through a resistance-voltage (n/V) converter and then uses the DC VM is used for digital measurement, and the display is 2, k or M. Therefore, for digital rate meters, the first step is to calibrate the true current and voltage functions, and then calibrate the ampere resistance.
2 Technical requirements
1 Calibration requirements
The DC digital meter under inspection shall meet the various technical requirements specified in this standard. 2 Appearance and power inspection
In order to ensure the safety and operation of the instrument, the appearance and power-on inspection shall be carried out before calibration. 2.1 The appearance is intact, and the panel indication, digital mechanism, manufacturer, model, number, etc. are clearly marked.
The appearance and exposed parts of the instrument shall not be damaged or detached, and the casing, There should be no looseness or looseness at the end. 2.2
2.3 Only movable parts, such as switch, adjustment mechanism, etc., can rotate normally. 2.4
Only the instrument components, connecting cables, power cords, etc., should be in good condition. The power supply voltage, rated power mark, etc. of the instrument should be correct.
3 Principles for selecting calibration points
3.1 The basic range is the key range to measure the performance of an LC-1>VM. Calibration should be carried out in detail: 3.1 If the linear tolerance of the meter under test is considered, the differential test points should be selected evenly. 3.3 For non-basic measurement points, the continuity of the upper and lower ranges and the maximum error point corresponding to the basic range should be considered. Based on the above requirements, 10 fixed points are generally taken within the basic measuring range; 3 to 5 calibration points are taken in the non-basic measuring range. 4.1 The absolute error represented by the sum of two errors can be expressed in one of the following forms: a==(ank,+%Rh)
wherein R is the set value (displayed value) of the measuring range; R.sup.--the filter value of the measuring range
α is the temperature difference coefficient related to the reading transmission; R.sup.--the error coefficient related to the full range value. 4.1.2 The relative error of the ratio of the absolute error 4 to the inspected meter reading K is: 730
4.2 Accuracy level
-±(e1)
The accuracy level of each digital receiving meter is divided into: 0.00, 0.0.02, 0.005, 0.01, 0.02, 0.05, 0.1, 0.2, 0.5, 1.0, etc., a total of 10 levels. Table 1 gives X>1XM1 and XM is a multi-level meter with different accuracy indicators! The level of DC digital meter is related to the measuring range of the meter. It is calculated by the following formula: 2. For the determination of the accuracy of the system or the measurement range of the whole system, the basic error coefficient is determined by the accuracy and stability of the system. The basic error coefficient of the meter is calculated by the following formula: - = (a%R+b,%Rm)
The basic error coefficient of the meter is 22.
.3.2 Requirements for graded IX-IOM should be in standard conditions, after heating, pre-adjustment, but not calibration, and verification of its wide performance. The error should not be less than ten ± (e%R%. The error coefficient of the meter under test is one year. The error index of the meter under test is no-year error, which can be determined by the meter department according to the actual measurement results. 4.3,3 After the stability of the car is determined, calibration is carried out again, and the basic error of TX-TXMT is verified, which is in accordance with the technical indicators specified in the data sheet.
Meet the above requirements for graded DL-LXJM, three verification conditions ||t t||—）Requirements for calibration equipment
5 Requirements for calibration equipment
5.1 The comprehensive error of the calibration equipment shall be less than 1/5-1/10 of the allowable error of the calibration equipment.2 The annual stability of the standard equipment shall be less than 1/5-1/10 of the allowable error of the calibration equipment.5.3 The error of the standard equipment due to the influence of temperature shall be less than 1/5-1/10 of the allowable error of the calibration equipment.5.4 The calibration instruments and measuring equipment used in the calibration shall be qualified after regular metrological calibration.5.5 When the accuracy level of the calibration equipment is not enough, the calibration results shall fall into the pending area: a review shall be conducted. If necessary, the error of the standard setting can be increased or a higher level measurement standard can be used. 5.6 The whole measuring system should have good calendar and ground coordination, and be far away from strong electricity and transmission fields to avoid external factors. (II) Environmental conditions for verification The basic error stability of the standard setting is verified and calibrated with the standard setting. The instrument is divided into A, B, and C groups according to the external conditions. Group A considers instruments and meters used in a good environment. The rated working conditions of LX-LXM are checked, verified and used as shown in Table 3. Standard conditions for DC integral period measurement Uncertain source rate Mixed frequency Atmospheric industry (release characteristics) Safety requirements Computer knowledge Electric plus distortion Current source Comprehensive standard design (comprehensive actual voltage) (I) Check items tt||Only table function%50W, for=1
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-industry 35 maximum peak deviation
overpayment 74
decay 3 applicable to dry straight class efficiency word change explosion decay neck setting work recording impact
Huaijing on the market
period limit liquid
atmosphere medical
(sea technology high voltage)
electric transmission telephone
ampere current electric fire direction
four test items day and test method
calibration T work strip
29%-80%
(no Yanlue)|| tt||\.Non.KPn
(up to 2200m;
network rated voltage +.0%
for the
limit value combination of the bed and the degree of fullness, there may be
the limit value combination may be harmful
naturally change the ticket to determine the correct.
110%A monitoring limit
and the fixed
smaller than 12%
for the DC-IX>M sent for inspection, the verification items mainly include the verification of basic error, the verification of accuracy, the verification of linear error, the test of display ability, the test of resolution, etc. (II) Calibration method
8 The basic error of the instrument shall be verified according to the following provisions. 8.1: Under standard conditions, turn on the power to preheat, and perform zero adjustment, adjustment and calibration according to the instructions. 8.2 According to the selected calibration points, perform the first calibration of each meter. 8.3 The basic error refers to the 241: model error inherent in the instrument. Within a 24h interval, the instrument is generally required to be powered on continuously; if conditions are limited, it can also be powered on intermittently (after the new power is turned on, the product should be adjusted according to the specified time). After calibration, no operation is performed for a period of time.
month.4 The measurement data of each range of the tested meter within 241 is not less than 3 ohms, and the error of each measured data is taken as the average basic error of the tested meter.
9 The error verification method of DC-LOM can be divided into the following 3 methods; standard resistor method: resistance calibrator method: international standard meter method,
9.1 Standard resistance method
This method is shown in Figure 1. Assume that the DC standard resistance value is R, that is, the actual resistance value; the display reading of the tested meter is R13, then the absolute delay of the tested meter is
△-I-RN
The relative error of the natural control microphone is expressed as Rsx100%
×100%
Figure! The power supply of the device is tested. ...
This determination method is basically the same as the standard resistor method. This method can determine the cohesion of LX-LXM: the multi-disc ten-selection electric box method can be used to calibrate the DC-DOM display capability and the maximum reduction of 9.2 electric car calibration.
3 is to use a resistance calibrator (or a multifunctional standard source with European exhaustion function) to calibrate the range of 1XHX)M. The output standard resistance value of the standard resistance calibrator is R, the display reading value of DCDOM is K, and the range error of the meter is
The relative error of the meter is R--Rxx100%max*x=R×100%
The full-line method is applicable to the calibration of LC-LOM high-voltage limit code: the four-wire socket method is applicable to the calibration of IX-[XM low-voltage limit code, how to use the two-wire connection method and the principle of the line connection method is the same as the standard resistor method. 9.3 Standard digital ohmmeter operation (comparison method) This method is shown in Figure 4, that is, a standard digital ohmmeter or a standard ohmmeter with ohm function (M), a 733
, and a standard resistor with different nominal values (10, 10°Q; a multi-disc 1 resistor screen, etc.) can be used to calibrate the ohmmeter simply and conveniently. The digital ohmmeter is only used for the purpose of standardizing the electrical equipment (limited by the continuous reporting method: (h) can be used in conjunction with the standard digital ohmmeter method in Figure 4 to determine the accuracy of the ohmmeter. This method is to input the same standard value of voltage into the standard digital ohmmeter and the digital ohmmeter to be tested respectively: Assume that the display reading of the standard digital ohmmeter is , the display reading of the digital ohmmeter to be tested is R, the absolute error of the test meter is
, and the relative error of the test meter is expressed as a percentage as RN×100%
RRN×100%
1 Qualitative verification
10.1 Stability verification shall be carried out under the standard conditions listed in Table 2: It shall be carried out within the specified time range. The verification method is the same as the verification method described in 9.1--9.3, and either one may be selected. 10.2 After preheating and pre-adjustment of the DC-TVM, it shall be kept constant without When adjusting the meter again, insert a standard resistor into the meter and observe the resistance displayed at each test point. 10.3 The rated attenuation rate specified by the tester can be measured within the specified time; but the rated DC-LDOM must be subjected to a 24h short-term stability test and a 12-year long-term stability test. The maximum constant error value is found from the recorded value, and the error formula indicator is used to determine whether the test meter is qualified.
11 Verification of linear error
Linear error is an important technical characteristic to measure the quality of the test meter. This indicator is generally within the basic range: combined with the verification of the basic error, the error detection of TX-TX.JMI is The determination method is also suitable for the calibration of load-bearing errors. The linear error can be calculated using the following formula:
2×100%
Where: 2 The maximum energy error at each test point in the same range: 1 is the corresponding theoretical range value; 2 is the linear error,
(III) Calibration of other items
Determination of display capability
For L-LOM (or LMM that only performs functional calibration) the display capability can be determined by powering on the transformer. The value output by the electric device is as follows: Take the current 2-call sequence as an example, and the explanation is as follows:
0.300 0 0.0J0 0.000 1 ±0.4H 2.0.000 8 0.300 90, 40. 0.0 90,M2 (0.008 90.9 00.599 9 1,000 0 1.000 0 1.999 9 If the measured points are not reduced and the above changes are made, the display capacity is in line with the requirements. When called, the display of the readings is continuous, there are repeated characters, and the display is effective. The decimal point, unit symbol and over-range display capacity should also be checked. 13 Determination of decimal point
is generally only used for small range to measure the meter's energy quotient group knife (single degree), and a measuring device with high resolution is used for measurement, so that each device gives an electric mother plus the meter being tested. When the meter shows a certain value, the test panel will output the standard value of the device at the same time, and then fine-tune the current value to make the meter read the standard indication R, and the sum of the two standard indications R=RR is the resolution of the meter. The above only gives the verification items and test methods under normal conditions. In some special cases, the user's requirements or instructions are required, such as adding some other low-level measurements or tests, such as resistance test, time-to-discharge test, power supply voltage change test, etc., which are no longer specified in the technical regulations. 5. Processing of control results and calibration cycle
(1. Treatment of standard equipment
) The calibration of 141X-XM should have complete original records, and the original data should be accurately calculated and necessary mathematically processed (standard equipment plus standard value, etc.). The calibration records are generally kept for one year. The effective value of the calibration data given by 1S is generally one more than the actual value of the blank table. The relevant numbers in the calibration record should be rounded off after calculation. The error caused by rounding should not exceed 1/1 of the error of the meter reading. 1:1
17 When judging whether the test object is qualified, the estimated number after rounding should be used as the basis. Determine whether the test report is qualified: 18. The calibration certificate shall give the annual stability of the error period of 24F. Under the requirements of the test unit, the calibration results of other time intervals can also be checked. 10. The DC.[XM] required for grading: The metrology department shall calibrate according to the grading standards of this regulation, determine the accuracy level, and give it in the calibration certificate. 20. The grading must have accurate certificate evidence, and the first delivery result cannot be delayed. 21. In addition to the error data, the test results of other technical indicators must also be on the calibration certificate! 1.22 The qualified meter is issued with a calibration certificate 23. For instruments that cannot be calibrated according to the current process or do not require grading or fail the calibration, a test result notice or a certificate of conformity shall be issued, giving the actual error or failure date of the calibration result, and the official seal shall be affixed. (II) Calibration reason book
34 "X,[XOV. After the damage is repaired, it shall be calibrated subsequently. 25
New or purchased DM shall be modified and no one shall use it again. 26. As a replacement measuring instrument, [C-TXM must be periodically controlled. The calibration cycle is stipulated to be 1 year. In special circumstances, it can be shortened or extended appropriately.
Testing unit
Manufacturer
Risk determination
(I) Basic error
DC digital ohm attenuation test record format
Test period
Test gain
Machine value (a)
【-】Quality
(II) Linear error
IV) Display
(V) Divided into
(VI) From other performance tests
(:1 Test conclusion.
Device abbreviation
Sensitive control variable display value【
Fan correct error is!1. Verification conclusion.
device abbreviation
sensitive control variable display value【
Fan right or wrong!1. Verification conclusion.
device abbreviation
sensitive control variable display value【
Fan right or wrong!1. Verification conclusion.
device abbreviation
sensitive control variable display value【
Fan right or wrong!1. Verification conclusion.
device abbreviation
sensitive control variable display value【
Fan right or wrong!1 Standard resistance solution method
This method is shown in Figure 1. Assume that the DC standard resistance value is R, that is, the actual resistance value; the water display reading of the meter under test is R13, then the absolute delay of the meter under test is
△-I-RN
The relative error of the natural control microphone is expressed by hundreds of lasers: Rsx100%
×100%
Figure! The power supply of the device is tested. ...
This determination method is basically the same as the standard resistor method. This method can determine the cohesion of LX-LXM: the multi-disc ten-selection electric box method can be used to calibrate the DC-DOM display capability and the maximum reduction of 9.2 electric car calibration.
3 is to use a resistance calibrator (or a multifunctional standard source with European exhaustion function) to calibrate the range of 1XHX)M. The output standard resistance value of the standard resistance calibrator is R, the display reading value of DCDOM is K, and the range error of the meter is
The relative error of the meter is R--Rxx100%max*x=R×100%
The full-line method is applicable to the calibration of LC-LOM high-voltage limit code: the four-wire socket method is applicable to the calibration of IX-[XM low-voltage limit code, how to use the two-wire connection method and the principle of the line connection method is the same as the standard resistor method. 9.3 Standard digital ohmmeter operation (comparison method) This method is shown in Figure 4, that is, a standard digital ohmmeter or a standard ohmmeter with ohm function (M), a 733
, and a standard resistor with different nominal values (10, 10°Q; a multi-disc 1 resistor screen, etc.) can be used to calibrate the ohmmeter simply and conveniently. The digital ohmmeter is only used for the purpose of standardizing the electrical equipment (limited by the continuous reporting method: (h) can be used in conjunction with the standard digital ohmmeter method in Figure 4 to determine the accuracy of the ohmmeter. This method is to input the same standard value of voltage into the standard digital ohmmeter and the digital ohmmeter to be tested respectively: Assume that the display reading of the standard digital ohmmeter is , the display reading of the digital ohmmeter to be tested is R, the absolute error of the test meter is
, and the relative error of the test meter is expressed as a percentage as RN×100%
RRN×100%
1 Qualitative verification
10.1 Stability verification shall be carried out under the standard conditions listed in Table 2: It shall be carried out within the specified time range. The verification method is the same as the verification method described in 9.1--9.3, and either one may be selected. 10.2 After preheating and pre-adjustment of the DC-TVM, it shall be kept constant without When adjusting the meter again, insert a standard resistor into the meter and observe the resistance displayed at each test point. 10.3 The rated attenuation rate specified by the tester can be measured within the specified time; but the rated DC-LDOM must be subjected to a 24h short-term stability test and a 12-year long-term stability test. The maximum constant error value is found from the recorded value, and the error formula indicator is used to determine whether the test meter is qualified.
11 Verification of linear error
Linear error is an important technical characteristic to measure the quality of the test meter. This indicator is generally within the basic range: combined with the verification of the basic error, the error detection of TX-TX.JMI is The determination method is also suitable for the calibration of load-bearing errors. The linear error can be calculated using the following formula:
2×100%
Where: 2 The maximum energy error at each test point in the same range: 1 is the corresponding theoretical range value; 2 is the linear error,
(III) Calibration of other items
Determination of display capability
For L-LOM (or LMM that only performs functional calibration) the display capability can be determined by powering on the transformer. The value output by the electric device is as follows: Take the current 2-call sequence as an example, and the explanation is as follows:
0.300 0 0.0J0 0.000 1 ±0.4H 2.0.000 8 0.300 90, 40. 0.0 90,M2 (0.008 90.9 00.599 9 1,000 0 1.000 0 1.999 9 If the measured points are not reduced and the above changes are made, the display capacity is in line with the requirements. When called, the display of the readings is continuous, there are repeated characters, and the display is effective. The decimal point, unit symbol and over-range display capacity should also be checked. 13 Determination of decimal point
is generally only used for small range to measure the meter's energy quotient group knife (single degree), and a measuring device with high resolution is used for measurement, so that each device gives an electric mother plus the meter being tested. When the meter shows a certain value, the test panel will output the standard value of the device at the same time, and then fine-tune the current value to make the meter read the standard indication R, and the sum of the two standard indications R=RR is the resolution of the meter. The above only gives the verification items and test methods under normal conditions. In some special cases, the user's requirements or instructions are required, such as adding some other low-level measurements or tests, such as resistance test, time-to-discharge test, power supply voltage change test, etc., which are no longer specified in the technical regulations. 5. Processing of control results and calibration cycle
(1. Treatment of standard equipment
) The calibration of 141X-XM should have complete original records, and the original data should be accurately calculated and necessary mathematically processed (standard equipment plus standard value, etc.). The calibration records are generally kept for one year. The effective value of the calibration data given by 1S is generally one more than the actual value of the blank table. The relevant numbers in the calibration record should be rounded off after calculation. The error caused by rounding should not exceed 1/1 of the error of the meter reading. 1:1
17 When judging whether the test object is qualified, the estimated number after rounding should be used as the basis. Determine whether the test report is qualified: 18. The calibration certificate shall give the annual stability of the error period of 24F. Under the requirements of the test unit, the calibration results of other time intervals can also be checked. 10. The DC.[XM] required for grading: The metrology department shall calibrate according to the grading standards of this regulation, determine the accuracy level, and give it in the calibration certificate. 20. The grading must have accurate certificate evidence, and the first delivery result cannot be delayed. 21. In addition to the error data, the test results of other technical indicators must also be on the calibration certificate! 1.22 The qualified meter is issued with a calibration certificate 23. For instruments that cannot be calibrated according to the current process or do not require grading or fail the calibration, a test result notice or a certificate of conformity shall be issued, giving the actual error or failure date of the calibration result, and the official seal shall be affixed. (II) Calibration reason book
34 "X,[XOV. After the damage is repaired, it shall be calibrated subsequently. 25
New or purchased DM shall be modified and no one shall use it again. 26. As a replacement measuring instrument, [C-TXM must be periodically controlled. The calibration cycle is stipulated to be 1 year. In special circumstances, it can be shortened or extended appropriately.
Testing unit
Manufacturer
Risk determination
(I) Basic error
DC digital ohm attenuation test record format
Test period
Test gain
Machine value (a)
【-】Quality
(II) Linear error
IV) Display
(V) Divided into
(VI) From other performance tests
(:1 Test conclusion.
Device abbreviation
Sensitive control variable display value【
Fan correct error is!1 Standard resistance solution method
This method is shown in Figure 1. Assume that the DC standard resistance value is R, that is, the actual resistance value; the water display reading of the meter under test is R13, then the absolute delay of the meter under test is
△-I-RN
The relative error of the natural control microphone is expressed by hundreds of lasers: Rsx100%
×100%
Figure! The power supply of the device is tested. ...
This determination method is basically the same as the standard resistor method. This method can determine the cohesion of LX-LXM: the multi-disc ten-selection electric box method can be used to calibrate the DC-DOM display capability and the maximum reduction of 9.2 electric car calibration.
3 is to use a resistance calibrator (or a multifunctional standard source with European exhaustion function) to calibrate the range of 1XHX)M. The output standard resistance value of the standard resistance calibrator is R, the display reading value of DCDOM is K, and the range error of the meter is
The relative error of the meter is R--Rxx100%max*x=R×100%
The full-line method is applicable to the calibration of LC-LOM high-voltage limit code: the four-wire socket method is applicable to the calibration of IX-[XM low-voltage limit code, how to use the two-wire connection method and the principle of the line connection method is the same as the standard resistor method. 9.3 Standard digital ohmmeter operation (comparison method) This method is shown in Figure 4, that is, a standard digital ohmmeter or a standard ohmmeter with ohm function (M), a 733
, and a standard resistor with different nominal values (10, 10°Q; a multi-disc 1 resistor screen, etc.) can be used to calibrate the ohmmeter simply and conveniently. The digital ohmmeter is only used for the purpose of standardizing the electrical equipment (limited by the continuous reporting method: (h) can be used in conjunction with the standard digital ohmmeter method in Figure 4 to determine the accuracy of the ohmmeter. This method is to input the same standard value of voltage into the standard digital ohmmeter and the digital ohmmeter to be tested respectively: Assume that the display reading of the standard digital ohmmeter is , the display reading of the digital ohmmeter to be tested is R, the absolute error of the test meter is
, and the relative error of the test meter is expressed as a percentage as RN×100%
RRN×100%
1 Qualitative verification
10.1 Stability verification shall be carried out under the standard conditions listed in Table 2: It shall be carried out within the specified time range. The verification method is the same as the verification method described in 9.1--9.3, and either one may be selected. 10.2 After preheating and pre-adjustment of the DC-TVM, it shall be kept constant without When adjusting the meter again, insert a standard resistor into the meter and observe the resistance displayed at each test point. 10.3 The rated attenuation rate specified by the tester can be measured within the specified time; but the rated DC-LDOM must be subjected to a 24h short-term stability test and a 12-year long-term stability test. The maximum constant error value is found from the recorded value, and the error formula indicator is used to determine whether the test meter is qualified.
11 Verification of linear error
Linear error is an important technical characteristic to measure the quality of the test meter. This indicator is generally within the basic range: combined with the verification of the basic error, the error detection of TX-TX.JMI is The determination method is also suitable for the calibration of load-bearing errors. The linear error can be calculated using the following formula:
2×100%
Where: 2 The maximum energy error at each test point in the same range: 1 is the corresponding theoretical range value; 2 is the linear error,
(III) Calibration of other items
Determination of display capability
For L-LOM (or LMM that only performs functional calibration) the display capability can be determined by powering on the transformer. The value output by the electric device is as follows: Take the current 2-call sequence as an example, and the explanation is as follows:
0.300 0 0.0J0 0.000 1 ±0.4H 2.0.000 8 0.300 90, 40. 0.0 90,M2 (0.008 90.9 00.599 9 1,000 0 1.000 0 1.999 9 If the measured points are not reduced and the above changes are made, the display capacity is in line with the requirements. When called, the display of the readings is continuous, there are repeated characters, and the display is effective. The decimal point, unit symbol and over-range display capacity should also be checked. 13 Determination of decimal point
is generally only used for small range to measure the meter's energy quotient group knife (single degree), and a measuring device with high resolution is used for measurement, so that each device gives an electric mother plus the meter being tested. When the meter shows a certain value, the test panel will output the standard value of the device at the same time, and then fine-tune the current value to make the meter read the standard indication R, and the sum of the two standard indications R=RR is the resolution of the meter. The above only gives the verification items and test methods under normal conditions. In some special cases, the user's requirements or instructions are required, such as adding some other low-level measurements or tests, such as resistance test, time-to-discharge test, power supply voltage change test, etc., which are no longer specified in the technical regulations. 5. Processing of control results and calibration cycle
(1. Treatment of standard equipment
) The calibration of 141X-XM should have complete original records, and the original data should be accurately calculated and necessary mathematically processed (standard equipment plus standard value, etc.). The calibration records are generally kept for one year. The effective value of the calibration data given by 1S is generally one more than the actual value of the blank table. The relevant numbers in the calibration record should be rounded off after calculation. The error caused by rounding should not exceed 1/1 of the error of the meter reading. 1:1
17 When judging whether the test object is qualified, the estimated number after rounding should be used as the basis. Determine whether the test report is qualified: 18. The calibration certificate shall give the annual stability of the error period of 24F. Under the requirements of the test unit, the calibration results of other time intervals can also be checked. 10. The DC.[XM] required for grading: The metrology department shall calibrate according to the grading standards of this regulation, determine the accuracy level, and give it in the calibration certificate. 20. The grading must have accurate certificate evidence, and the first delivery result cannot be delayed. 21. In addition to the error data, the test results of other technical indicators must also be on the calibration certificate! 1.22 The qualified meter is issued with a calibration certificate 23. For instruments that cannot be calibrated according to the current process or do not require grading or fail the calibration, a test result notice or a certificate of conformity shall be issued, giving the actual error or failure date of the calibration result, and the official seal shall be affixed. (II) Calibration reason book
34 "X,[XOV. After the damage is repaired, it shall be calibrated subsequently. 25
New or purchased DM shall be modified and no one shall use it again. 26. As a replacement measuring instrument, [C-TXM must be periodically controlled. The calibration cycle is stipulated to be 1 year. In special circumstances, it can be shortened or extended appropriately.
Testing unit
Manufacturer
Risk determination
(I) Basic error
DC digital ohm attenuation test record format
Test period
Test gain
Machine value (a)
【-】Quality
(II) Linear error
IV) Display
(V) Divided into
(VI) From other performance tests
(:1 Test conclusion.
Device abbreviation
Sensitive control variable display value【
Fan correct error is!1. Verification conclusion.
device abbreviation
sensitive control variable display value【
Fan right or wrong!1. Verification conclusion.
device abbreviation
sensitive control variable display value【
Fan right or wrong!1. Verification conclusion.
device abbreviation
sensitive control variable display value【
Fan right or wrong!1. Verification conclusion.
device abbreviation
sensitive control variable display value【
Fan right or wrong!3 Standard digital ohmmeter operation (comparison method) This method is shown in Figure 4, that is, a standard digital ohmmeter or a standard M with ohm function, a 733
, and a standard resistor with different nominal values (10, 10°Q; multiple disks 1 into the resistance screen, etc.) can be used to simply and conveniently calibrate the ohmmeter. The internal accuracy of the digital ohmmeter is limited to the digital ohmmeter (, the continuous reporting method: (h) can be continued by using the standard digital ohmmeter method in Figure 4. The method is to input the same standard value of the voltage into the standard digital ohmmeter and the digital ohmmeter to be tested respectively: Assume that the display reading of the standard digital ohmmeter is , the display reading of the digital ohmmeter to be tested is R, the absolute error of the test meter is
, and the relative error of the test meter is expressed in percentage as RN×100%
RRN×100%
1 Qualitative verification
10.1 Stability verification should be carried out under the standard conditions listed in Table 2: It should be carried out within the specified time range. The verification method is the same as the verification method described in 9.1--9.3, and either one can be selected. 10.2 After the DC-TVM is preheated and pre-adjusted, it will no longer When adjusting the meter, insert a standard resistor into the meter and observe the resistance displayed at each test point. 10.3 The attenuation rate specified by the specification can be measured to determine the stability of the meter within the specified time; but the rated DC-LDOM must be subjected to a 24h short-term stability test and a 12-year long-term stability test. The maximum constant error value is found from the recorded value, and the error formula indicator is used to determine whether the meter is qualified.
11 Verification of linear error
Linear error is an important technical characteristic to measure the quality of the meter. This indicator is generally within the basic range: combined with the verification of the basic error, the error verification of TX-TX.JMI is carried out. The method is also suitable for the calibration of load-bearing errors. The load-bearing error can be calculated using the following formula:
2×100%
Where: 2 The maximum energy error of each test point in the same range: 1 is the corresponding theoretical range value; 2 is the linear error,
(III) Calibration of other items
Determination of display capability
For L-LOM (or LMM that only performs functional calibration) the display capability can be measured together with the power-on test. The value output by the electric device is 9×100%, and the current car 2 call sequence is taken as an example, as follows:
0.300 0 0.0J0 0.000 1 ±0.4H 2.0.000 8 0.300 90, 40. 0.0 90,M2 (0.008 90.9 00.599 9 1,000 0 1.000 0 1.999 9 If the measured points are not reduced and the above changes are made, the display capacity is in line with the requirements. When called, the display of the readings is continuous, there are repeated characters, and the display is effective. The decimal point, unit symbol and over-range display capacity should also be checked. 13 Determination of decimal point
is generally only used for small range to measure the meter's energy quotient group knife (single degree), and a measuring device with high resolution is used for measurement, so that each device gives an electric mother plus the meter being tested. When the meter shows a certain value, the test panel will output the standard value of the device at the same time, and then fine-tune the current value to make the meter read the standard indication R, and the sum of the two standard indications R=RR is the resolution of the meter. The above only gives the verification items and test methods under normal conditions. In some special cases, the user's requirements or instructions are required, such as adding some other low-level measurements or tests, such as resistance test, time-to-discharge test, power supply voltage change test, etc., which are no longer specified in the technical regulations. 5. Processing of control results and calibration cycle
(1. Treatment of standard equipment
) The calibration of 141X-XM should have complete original records, and the original data should be accurately calculated and necessary mathematically processed (standard equipment plus standard value, etc.). The calibration records are generally kept for one year. The effective value of the calibration data given by 1S is generally one more than the actual value of the blank table. The relevant numbers in the calibration record should be rounded off after calculation. The error caused by rounding should not exceed 1/1 of the error of the meter reading. 1:1
17 When judging whether the test object is qualified, the estimated number after rounding should be used as the basis. Determine whether the test report is qualified: 18. The calibration certificate shall give the annual stability of the error period of 24F. Under the requirements of the test unit, the calibration results of other time intervals can also be checked. 10. The DC.[XM] required for grading: The metrology department shall calibrate according to the grading standards of this regulation, determine the accuracy level, and give it in the calibration certificate. 20. The grading must have accurate certificate evidence, and the first delivery result cannot be delayed. 21. In addition to the error data, the test results of other technical indicators must also be on the calibration certificate! 1.22 The qualified meter is issued with a calibration certificate 23. For instruments that cannot be calibrated according to the current process or do not require grading or fail the calibration, a test result notice or a certificate of conformity shall be issued, giving the actual error or failure date of the calibration result, and the official seal shall be affixed. (II) Calibration reason book
34 "X,[XOV. After the damage is repaired, it shall be calibrated subsequently. 25
New or purchased DM shall be modified and no one shall use it again. 26. As a replacement measuring instrument, [C-TXM must be periodically controlled. The calibration cycle is stipulated to be 1 year. In special circumstances, it can be shortened or extended appropriately.
Testing unit
Manufacturer
Risk determination
(I) Basic error
DC digital ohm attenuation test record format
Test period
Test gain
Machine value (a)
【-】Quality
(II) Linear error
IV) Display
(V) Divided into
(VI) From other performance tests
(:1 Test conclusion.
Device abbreviation
Sensitive control variable display value【
Fan correct error is!3 Standard digital ohmmeter operation (comparison method) This method is shown in Figure 4, that is, a standard digital ohmmeter or a standard M with ohm function, a 733
, and a standard resistor with different nominal values (10, 10°Q; multiple disks 1 into the resistance screen, etc.) can be used to simply and conveniently calibrate the ohmmeter. The internal accuracy of the digital ohmmeter is limited to the digital ohmmeter (, the continuous reporting method: (h) can be continued by using the standard digital ohmmeter method in Figure 4. The method is to input the same standard value of the voltage into the standard digital ohmmeter and the digital ohmmeter to be tested respectively: Assume that the display reading of the standard digital ohmmeter is , the display reading of the digital ohmmeter to be tested is R, the absolute error of the test meter is
, and the relative error of the test meter is expressed in percentage as RN×100%
RRN×100%
1 Qualitative verification
10.1 Stability verification should be carried out under the standard conditions listed in Table 2: It should be carried out within the specified time range. The verification method is the same as the verification method described in 9.1--9.3, and one of them can be selected. 10.2 After the DC-TVM is preheated and pre-adjusted, it will no longer When adjusting the meter, insert a standard resistor into the meter and observe the resistance displayed at each test point. 10.3 The attenuation rate specified by the specification can be measured to determine the stability of the meter within the specified time; but the rated DC-LDOM must be subjected to a 24h short-term stability test and a year-long stability test. The maximum constant error value is found from the recorded value, and the error formula indicator is used to determine whether the meter is qualified.
11 Verification of linear error
Linear error is an important technical characteristic to measure the quality of the meter. This indicator is generally within the basic range: combined with the verification of the basic error, the error verification of TX-TX.JMI is carried out. The method is also suitable for the calibration of load-bearing errors. The load-bearing error can be calculated using the following formula:
2×100%
Where: 2 The maximum energy error of each test point in the same range: 1 is the corresponding theoretical range value; 2 is the linear error,
(III) Calibration of other items
Determination of display capability
For L-LOM (or LMM that only performs functional calibration) the display capability can be measured together with the power-on test. The value output by the electric device is 9×100%, and the current car 2 call sequence is taken as an example, as follows:
0.300 0 0.0J0 0.000 1 ±0.4H 2.0.000 8 0.300 90, 40. 0.0 90,M2 (0.008 90.9 00.599 9 1,000 0 1.000 0 1.999 9 If the measured points are not reduced and the above changes are made, the display capacity is in line with the requirements. When called, the display of the readings is continuous, there are repeated characters, and the display is effective. The decimal point, unit symbol and over-range display capacity should also be checked. 13 Determination of decimal point
is generally only used for small range to measure the meter's energy quotient group knife (single degree), and a measuring device with high resolution is used for measurement, so that each device gives an electric mother plus the meter being tested. When the meter shows a certain value, the test panel will output the standard value of the device at the same time, and then fine-tune the current value to make the meter read the standard indication R, and the sum of the two standard indications R=RR is the resolution of the meter. The above only gives the verification items and test methods under normal conditions. In some special cases, the user's requirements or instructions are required, such as adding some other low-level measurements or tests, such as resistance test, time-to-discharge test, power supply voltage change test, etc., which are no longer specified in the technical regulations. 5. Processing of control results and calibration cycle
(1. Treatment of standard equipment
) The calibration of 141X-XM should have complete original records, and the original data should be accurately calculated and necessary mathematically processed (standard equipment plus standard value, etc.). The calibration records are generally kept for one year. The effective value of the calibration data given by 1S is generally one more than the actual value of the blank table. The relevant numbers in the calibration record should be rounded off after calculation. The error caused by rounding should not exceed 1/1 of the error of the meter reading. 1:1
17 When judging whether the test object is qualified, the estimated number after rounding should be used as the basis. Determine whether the test report is qualified: 18. The calibration certificate shall give the annual stability of the error period of 24F. Under the requirements of the test unit, the calibration results of other time intervals can also be checked. 10. The DC.[XM] required for grading: The metrology department shall calibrate according to the grading standards of this regulation, determine the accuracy level, and give it in the calibration certificate. 20. The grading must have accurate certificate evidence, and the first delivery result cannot be delayed. 21. In addition to the error data, the test results of other technical indicators must also be on the calibration certificate! 1.22 The qualified meter is issued with a calibration certificate 23. For instruments that cannot be calibrated according to the current process or do not require grading or fail the calibration, a test result notice or a certificate of conformity shall be issued, giving the actual error or failure date of the calibration result, and the official seal shall be affixed. (II) Calibration reason book
34 "X,[XOV. After the damage is repaired, it shall be calibrated subsequently. 25
New or purchased DM shall be modified and no one shall use it again. 26. As a replacement measuring instrument, [C-TXM must be periodically controlled. The calibration cycle is stipulated to be 1 year. In special circumstances, it can be shortened or extended appropriately.
Testing unit
Manufacturer
Risk determination
(I) Basic error
DC digital ohm attenuation test record format
Test period
Test gain
Machine value (a)
【-】Quality
(II) Linear error
IV) Display
(V) Divided into
(VI) From other performance tests
(:1 Test conclusion.
Device abbreviation
Sensitive control variable display value【
Fan correct error is!999 9 If the measured points do not change as mentioned above, the display capability meets the requirements. When the display is called, the reading is continuous, there are repeated characters, and the display is effective. The decimal point, unit symbol and over-range display capability should also be checked. The determination of the decimal point is generally only done on the small range to the meter's ability to divide (unit), and a measuring device with high resolution is used for measurement, so that each device gives a red meter under test. When the meter shows a certain value, the standard value of the measuring device is also displayed at the same time, and then the system value is fine-tuned to make the meter under test read the standard indication R at the end of the meter. The sum of the two standard indications is R=RR, which is the resolution of the meter. The above only gives the verification items and test methods under general conditions. In certain special cases, the user's requirements or the card only need to be specified, some low-level measurements or additions are required, such as resistance test, release test, power supply voltage change test, etc., and the technical regulations are no longer required. 5. Processing of control results and calibration cycle
(Specification of the calibration result)
The calibration of 141X-XM should have complete original records, and the original data should be accurately calculated and necessary mathematically processed (standard device plus standard value, etc.). The calibration records are generally kept for one year. The valid number of the calibration data given by 1S is generally one more than the actual value of the calibration data. The calibration record should be fully rounded, and the error caused by the rounding should not exceed 1/1 of the reading error of the calibration data. 1:1
17 When judging whether the calibration data is qualified, the estimated number after rounding should be used as the basis. Determine whether the test report is qualified: 18. The calibration certificate shall give the annual stability of the error period of 24F. Under the requirements of the test unit, the calibration results of other time intervals can also be checked. 10. The DC.[XM] required for grading: The metrology department shall calibrate according to the grading standards of this regulation, determine the accuracy level, and give it in the calibration certificate. 20. The grading must have accurate certificate evidence, and the first delivery result cannot be delayed. 21. In addition to the error data, the test results of other technical indicators must also be on the calibration certificate! 1.22. The qualified meter shall be issued with a calibration certificate. 23. For instruments that cannot be calibrated according to the current process or do not require grading or fail the calibration, a test result notice or a certificate of conformity shall be issued, giving the actual error or failure date of the calibration result, and the official seal shall be affixed. (II) Calibration reason book
34 "X,[XOV. After the damage is repaired, it shall be calibrated subsequently. 25
New or purchased DM shall be modified and no one shall use it again. 26. As a replacement measuring instrument, [C-TXM must be periodically controlled. The calibration cycle is stipulated to be 1 year. In special circumstances, it can be shortened or extended appropriately.
Testing unit
Manufacturer
Risk determination
(I) Basic error
DC digital ohm attenuation test record format
Test period
Test gain
Machine value (a)
【-】Quality
(II) Linear error
IV) Display
(V) Divided into
(VI) From other performance tests
(:1 Test conclusion.
Device abbreviation
Sensitive control variable display value【
Fan correct error is!999 9 If the measured points do not change as mentioned above, the display capability meets the requirements. When the display is called, the reading is continuous, there are repeated characters, and the display is effective. The decimal point, unit symbol and over-range display capability should also be checked. The determination of decimal force is generally only performed on the small range to the meter's ability to divide (unit), and a measuring device with high resolution is used for measurement, so that each device gives a red meter under test. When the meter shows a certain value, the standard value of the measuring device is also displayed at the same time, and then the system value is fine-tuned to make the meter under test read the standard indication R at the end of the meter. The sum of the two standard indications is R=RR, which is the resolution of the meter. The above only gives the verification items and test methods under general conditions. In certain special cases, the user's requirements or only the error description card need to be specified, some other low-level measurements or tests are added, such as resistance to batch related tests, room temperature tests, power supply voltage change tests, etc., and the technical regulations are no longer required. 5. Processing of control results and calibration cycle
(Specification of the calibration result)
The calibration of 141X-XM should have complete original records, and the original data should be accurately calculated and necessary mathematically processed (standard device plus standard value, etc.). The calibration records are generally kept for one year. The valid number of the calibration data given by 1S is generally one more than the actual value of the calibration data. The calibration record should be fully rounded, and the error caused by the rounding should not exceed 1/1 of the reading error of the calibration data. 1:1
17 When judging whether the calibration data is qualified, the estimated number after rounding should be used as the basis. Determine whether the test report is qualified: 18. The calibration certificate shall give the annual stability of the error period of 24F. Under the requirements of the test unit, the calibration results of other time intervals can also be checked. 10. The DC.[XM] required for grading: The metrology department shall calibrate according to the grading standards of this regulation, determine the accuracy level, and give it in the calibration certificate. 20. The grading must have accurate certificate evidence, and the first delivery result cannot be delayed. 21. In addition to the error data, the test results of other technical indicators must also be on the calibration certificate! 1.22 The qualified meter is issued with a calibration certificate 23. For instruments that cannot be calibrated according to the current process or do not require grading or fail the calibration, a test result notice or a certificate of conformity shall be issued, giving the actual error or failure date of the calibration result, and the official seal shall be affixed. (II) Calibration reason book
34 "X,[XOV. After the damage is repaired, it shall be calibrated subsequently. 25
New or purchased DM shall be modified and no one shall use it again. 26. As a replacement measuring instrument, [C-TXM must be periodically controlled. The calibration cycle is stipulated to be 1 year. In special circumstances, it can be shortened or extended appropriately.
Testing unit
Manufacturer
Risk determination
(I) Basic error
DC digital ohm attenuation test record format
Test period
Test gain
Machine value (a)
【-】Quality
(II) Linear error
IV) Display
(V) Divided into
(VI) From other performance tests
(:1 Test conclusion.
Device abbreviation
Sensitive control variable display value【
Fan correct error is!
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