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The National Metrology Verification Regulations of the People's Republic of China JJG 919-1996
pH Meter Verification Instrument
Verifirating Meter for pH Metcrs1996 11- 21 Issued
1997-0501 Implementation
Kitchen Technical Supervision Bureau Issued
Jn:919-1996
pH Meter Verification Instrument Verification Regulations
Verification Meter for pH Meter pHMetersJ.IG919-1996
This regulation was reviewed and approved by the National Technical Commission on November 21, 1996, and was implemented on May 1, 1992.
Responsible unit: National Standard Material Research Center Drafting unit:
National Standard Material Research Center
The drafting unit is also responsible for interpreting the technical provisions of this regulation. The main drafters of this regulation are
Luo Diming
Hou Chuanjia
Participating drafter!
Chen Chaohui
—1996
【National Research Center for Standard Materials】
(National Research Center for Standard Materials)
(National Research Center for Standard Materials)
: Technical requirements
Verification case
Three inspection dates and sample method
(-) Appearance inspection
(-) Insulation test
Three) Verification of the verification results
Fourth verification period
JJG 919--1996
Appendix 125 when pI=pls pen 7 and the optimum value (mV) Appendix 20～100℃ value 7 value
J:0191996
H meter verification and acceptance verification procedures
This regulation is applicable to the new production, which will be used in the verification and verification technology requirements
1 The accuracy of the inspection should be concerned about the acid 1 3. Note the accuracy of the electronic components: 03 and (6H must have two types of non-limited instruments:
2 external measurement and control inspection
each adjustment card should be made normally, each image should be directly moved without any part of the movement: the pointer of the device should be clear, the image should be kept small, and the display should be clear, complete: the energy inspection should be able to move, the energy inspection should be normal, the panel should be 1 piece, the operation should be clear, and the light should be smooth. Single edge H room is not less than 20M1
2 display error
When the width is carried out according to the provisions of Article 15, it is determined to be 1 display false delivery to avoid 1 view:
5 oil degree compensation error
welcome degree compensation error refers to the compensation temperature under any compensation temperature. The error is equal to 3 units. This is actually added PH display wide delivery. When the block is not tested according to Article 16, In any position: external compensation temperature, temperature compensation error shall not exceed the specification of the meter,
Table 1 Calibration items and requirements of calibration instrument
. Accuracy (.H)
Temperature compensation error (EH)
Indication stability selection (H)
Resistor resistance
Detectable level
Detectable H indication error (H
6 Standard stability
= 10 %
.000 6
=0,000 6
When the calibration is carried out in accordance with Article 17, the indication value of the calibration equipment should be greater than that specified in Table 1:? When the calibration is carried out in accordance with Article 8, the value of the high limiter connected to the calibration instrument shall meet the requirements of Table 1! The value of the high resistor M and the calibration environment conditions shall meet the requirements of Table 2
The accuracy of the calibration instrument shall be 12H)
Treasure leakage/t.
15 -25
;19-1996
Test conditions
Table 2 Test records
Relative confusion/《%RIH)
Ten Hang cases
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, in fact, this will be timed, the female digital is under a good environment with the elements required in 2, can be replaced according to the quick effect of the electrician meter to the environment that is, the realistic chapter,
9 The laboratory has a good connection cell sound
10 The accuracy of the digital meter should be excellent for the verification of false small value recognition error 3 sections: 1110 (10.1%) M with open gold trap: 12500 (1) mega-sensor attack,
Test items and test methods
I] External inspection
13 External inspection and safety requirements of Article 2
(ii) General test
14, short circuit test of the power supply phase line and neutral line: the meter can be connected between the power phase line and the ground line of the single-hole power supply, and the power switch is tested at the connection point, but the power plug is not connected to the power grid. After the reverse voltage of 500V is 53, the insulation resistance is measured, and the value should be not less than 2UM9. (iii) Verification of the voltage meter
15EH small value error verification
Connect the circuit according to Figure 1, turn on K (R circuit): set the temperature compensator to 23.0, adjust the input voltage to = (that is, the positive potential of the calibrator, corresponding to the equipotential value of the meter), at this time the zero potential of the digital voltmeter (hereinafter referred to as the positive voltage) is within 10.2mV, and then the indication is cleared. Then adjust the pH value of the tester, record the value indicated on the table, repeat the measurement 3 times, and take the average value as the original value: between H7 and H7-6, check one point every 0.2 1, and then check one point every 1 H until p1=14 and I=(, calculate the pH error ApH of the tester using formula (1): E
ApH = (μH-7)-
rH The nominal H value of the tester:
The potential value of the meter.
The test result should meet the requirements of error 1,
16 Temperature compensation error test
G1-199
Figure 1 Circuit diagram
Connection diagram 1 Connect the circuit and the K circuit (R circuit) to set the temperature compensation of the tester to 25.0, adjust the potential output to H7, and the output value of the meter should meet the requirements of Table 1. Then set the temperature compensation to 25 respectively. According to the energy line, select the nominal temperature value including the two temperature width endpoints, and perform the test at 5°C. Adjust the central part to H-14 at different temperatures, and then record the actual potential value of the meter respectively. Repeat the test 3 times, and take The half mean value F is divided by the temperature compensation error ApH'A of the calibrator in (2) = 7 units. ApH'A
ApHi-7
Then the temperature compensation error of the calibrator in (1) is calculated into the temperature compensation error of the calibrator in (2) = 7 units. The pH value of the calibrator is calculated into the temperature compensation error of the calibrator in (1) = 3 units. The value should meet the requirements of the table.
Apllae
17 The calibration of the calibrator in (1) = 7 units. The temperature compensation is set at 25.t. The zero potential of the calibrator should be at = .2, and then the small value is raised: then adjust the tester, so that the small value is H = 10, and write down the voltage indication E:, calculate the H: signal according to formula (4):
pl.5u.157
Then read once every U,51, the white rate is 3h, the change of the medium voltage indication value or the corresponding H value is printed as the stability of the tester indication value, and the test is in accordance with the provisions of Table 18. The test of the wrong closure of the component
According to Figure 2, the line pin is connected, the switch K is connected (R is short-circuited), the temperature compensation of the tester is set to 25.0, and the middle position is adjusted to PH-14. The indication value when the electric giant meter is disconnected is V, which should meet the provisions of Table 1: H indication setting difference: then disconnect the switch K (connect to R), and read the electric Chen indication value V, at R. -1 (110.1% ）M's situation 3
JJG:919
According to the formula: Introduce high-definition heart feather letter people, China Fu Ying 3, only the value of the language into the table 1 ball R
2 high-definition process calibration line
Calibration result processing and calibration cycle
Movement to determine the instrument of the standard, issue a certificate of conformity, Shandou piece Qing schoolbzxZ.net
Hope to control the conclusion and judge it as the correct standard, the station is allowed to downgrade: when it is downgraded to the first level, it must be punished with the level 20
Special calibration instrument material requirements
Sign the period of determination
Appendix 1
.1G919—1996
25 when △pH display = pH display value ~ 7 corresponding to the millivolt number (1V) 1
Appendix 2
J.IG919-J996
0~100 k value and 7k value
221.(1-13
67,494
490.45
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