JJG 706-1990 Calibration Procedure for Automatic Balance Display Instruments with Position Control JJG706-1990 Standard download decompression password: www.bzxz.net

National Metrology Verification Regulation of the People's Republic of China JJG 706-—1990
Self-IalariceDisplay[nstrarnentswith Step-tontrol
Issued on August 6, 1990
Implementation on February 1, 1991
Promulgated by the State Bureau of Technical Supervision
JJG TOm—199n
Verification Regulation of Sclf-halanceDisplayInstramentswithStep-control
Yerification Regulation of Sclf-halanceDisplayInstramentswithStep-controlJJG 706-
This verification regulation was approved by the State Bureau of Technical Supervision on August 6, 1990, and came into effect on February 1, 1991.
Responsible unit: Shanghai Technical Supervision Bureau
Drafting unit: Shanghai Metrology and Basic Technology Research Institute The drafting unit is responsible for the technical provisions of this regulation. The main drafters of this regulation:
JJG706-1990
Cai Jialiang (Shanghai Metrology and Technology Research Institute) Lu Luanbi (Shanghai Metrology and Technology Research Institute) Technical requirements
Verification conditions
Verification items and verification methods
Specific verification results and control period
Appendix 1 1. The type of meter to be used should be the point current meter box 2. The calibration record format of the instrument with position or control period display (control part) 3. The instrument with public error test, recognition error, correction error and cut-off error (this specification requires a table)
JJt:706-1990
Calibration procedure for automatic balancing display instruments with position control This specification is for the calibration of newly manufactured, in use and statically maintained automatic balancing display instruments with position control (including active position difference meter and automatic balancing correction, hereinafter referred to as instruments). 1. Technical requirements
The control part of the instrument indication part shall meet the requirements of the dynamic half-balance bridge "[3G225-190" calibration regulations, and the dynamic potentiometer shall meet the requirements of the "JJG4-1983 calibration regulations" (Publisher's note: the above regulations are JJG74-14]
The instrument indication part shall meet the following requirements: 1. Setting range
It shall be able to set the instrument within the range of 19%-9% of the instrument's electrical range. 2. Setting point error
2.1 The setting pointer is set according to the indicating scale. 2.1.1 For instruments with a scale length of less than 14mm, the setting point error shall not exceed the allowable indication base error of the instrument:
For instruments with a scale length of less than or equal to 14mm, the setting point error shall not exceed the allowable indication base error of the instrument. 2.1.2
Basic error of the allowable pointer.
2.2 Instruments whose pointer is set according to the change of the recording paper 2.2.1 For instruments with a scale length of more than 14mm, the set point error should not be greater than the allowable recording error of the instrument:
2.2.2 For instruments with a scale length less than or equal to 140mm, the set point error should not be greater than 2 times the allowable recording basic error of the instrument.
2.3 For instruments with an input range of less than 5mV or a rated stroke time not greater than 1, when the accuracy level is better than 1,0, the allowable set point error shall be determined according to the 1.3 level of the instrument.
3.1 For instruments with a scale length greater than 140m, according to the used setting method, the initial error should not be greater than the instrument's minimum allowable range loss. 3.2 For instruments with a scale length less than or equal to 14Umm, depending on the setting method used, the accuracy should not be less than 3 times the instrument indication error or the recording range error. 3.3 For instruments with an output range less than 5rV or a rated operating time less than L5, when the accuracy level is better than 1.0, the instrument with a 1.0 rating shall be used to determine its allowable switching benefit. 4 When the ambient temperature is 15~35 and the relative humidity is 45%-75%, the insulation resistance between the output terminal and the instrument housing, the output terminal and the power supply terminal, and the insulation resistance between the input terminal and the output terminal shall be no less than 5M1
5 Insulation resistance
LFG706—199
Xian The ambient temperature is 1535 and the relative humidity is 45%. ～75%, apply AC 1500V test voltage between the output terminal and the instrument housing, the output terminal and the power terminal, the output terminal and the input terminal, and there should be no breakdown, flying and flashing phenomenon during the test. Note: Use positive voltage V, voltage: 1-10V, the test voltage can reach 000V. 6 Operation test
After the newly manufactured and repaired instruments are operated for 24 hours, all components, parts and mechanical devices in the meter should not have any failure. The setting error and switching error should still meet the requirements of Articles 2 and 3. 2. Verification conditions
7. Verification equipment
7.1 Determination of standard equipment
The allowable error (including the verification system error) is less than or equal to 1/3 of the allowable basic error of the meter being tested.
For the white dynamic potentiometer, a low potential potential difference meter with an accuracy level not less than 0.5 or a DC voltage source with equal accuracy should be selected: For the white balance bridge, a DC voltage source with an accuracy level of 1000×10F should be selected (the accuracy level of the input plate is 1~0000×10F, and the minimum value is 0000). The various specifications of the small resistance box should be selected. See the attached 2.2 Compensation wires that match the two graduation numbers and have a correction value at the end of the thermostat. 7.3 Special reverse wires
The resistance of the general wires connected to the bridge should meet the requirements of the manufacturer! The difference between the two connecting wires should not exceed 1/10 of the basic error allowed by the instrument. 7.4 Megaohmmeter
Output [V DC
7.5 Voltage test bench
Output AC voltage is greater than 15V, the frequency is Hz, and the power is not less than 0.25Hz. 7.6 Ultra-low frequency generator
7. High-frequency signal generator
7.8 Electrical connection signal indicator
7.9 AC stabilizer, 220V, 1kW, stability is 1%. 8 Calibration environmental conditions
8.1 Ambient temperature is 20-5, relative humidity is 45%-75%. S.2 In addition to the geomagnetic field, the surrounding environment should not affect the external magnetic field of the instrument. 9 AC power supply: 220 V, allowable deviation 1% rated frequency, rated deviation +1 harmonic current, ... Part of the silver to be connected is shown in the figure (taking a single-bit control as an example).
Electric lifting point signal indicator tank
Instrument front output terminal tapping wire surrounding
Inspected meter
12.2 Marking record meter calibration, reduce the record state to make: Marking meter should be in the record state and stop state.
12.3 The calibration is carried out at the scale length 10%, 50%, 50% of the scale line 1, Note: The inspection point can be increased according to the equipment requirements. 12.4 After setting the fixed point, carry out the calibration of the upward and downward stroke. When there is any doubt, carry out the calibration of the second stroke and the downward stroke, and calculate the average number of times: 3
JIG:7061990
123. Move the pointer to the center of the accumulative sensitive scale line. For the internal fixed mechanism, move the pointer to the inspection point, and then adjust the internal setting of the electric contact to make the electric contact in a just-on or just-off state. After the set point is set, give a signal to the indicator, starting from the lower limit value, the remote indicator is close to the set point. When the sequencer and the output status change, the measured input signal is the same! Switch value 41 to continue to increase the training signal, you can not count the twist back to thank the determination: m people: walking gradually into a trot signal, the finger meter received the set point, when the device also love the original medicine, the auxiliary state changes, the measured number is the next pan change false A
17 according to the upper, one stroke change value 1 fluorescent pollution change value A., 4 -:+A
or: 1.! - On, according to the value: when picking up the time. A,, A, is the average value of the set point identification rate = Europe: 12.8 Chinese formula to calculate the fixed point difference (nV or):
--the nominal value of the set point to be inspected is V or
13 The verification of the shore
is carried out between the exchange difference and the section point difference, and then the following formula is calculated. A4. - A1- A:
rated voltage difference (mV or n):
where: AAd
14 Insulation resistance
test instrument card is not according to the instrument card, a special "power switch", the circuit of the mother of the circuit, with a non-deception meter according to the provisions of the specification between the two terminals, .5 Insulation strength
test is not only not according to the power supply, the medium is false loss of other power level, the circuit of the end of the point to drop to the test, and the test on the 5th standard of the terminal to measure: the test level rises steadily to the specified value, the three-stage guarantee. There should be no flashover, flashover phenomenon, and then steadily drop to zero, cut off the test power supply,
16 Detailed test
This test can be carried out together with the indication and recording part of the operation test. Set the instrument set point at another place in the electrical column (or the actual scale value): and connect the input end to the ultra-low frequency signal transmitter to cause multi-point signal transmission, measure the amplitude of the section, and make the instrument pointer run within the required range of the scale length. After running, verify the set point recognition error and test thermal error at the set point, which shall meet the requirements of Articles 2 and 3. 706
IV. Processing of verification results and verification cycle
17 Any instrument that meets the technical requirements of this specification and [J:225-[950 Automatic Balancing Electrode Testing Regulations or 74-1983 Automatic Potential Testing Regulations] shall be required to obtain a verification certificate. If it fails, a verification result notice shall be issued.
18 The verification cycle of the instrument in use may be determined by the actual use situation of the product, and shall not exceed half a year at most.5
Appendix 1
The current resistor box that should be selected for various types of instruments
C-· 50
- 54- + 50
- S0 -:+ 1
56 1 50
0-·15J
- 50 -
50 - 1 50
-- - 100
-J... + 5
200-·400
-7(1. + 5
200·5H
- : 511 -- 150
0：500
Box Note Seat
Super Grid Instrument is Level
h,4)12
.i -,2- t*Effect& 2 - n.uf---.s --As x)
Effect Letter Table Service 10 Line
.sg un! c
,12 d 2, Heart Note 5 * Double 2:1.02—.05—1, ,5-.2—1—5, Is Small or Position 0.01 2n zx Appendix 2 Inspection form Accuracy grade Inspection scale JJG 706-[990 Verification record format of automatic balance display instrument with position control (control part) Verification record of automatic balance display instrument with position control (control part) Setting scale length Model specification Setting temperature Switching value (mV or) A (mV or) Setting result: Setting item Setting range Curve
Set point error
Switching difference
Output-external
Relay resistance
Isolation blood deficiency
Popular test
Output-source
Output-input
Output-housing
Output power
Output-input
Set point error
Switching difference
Verification certificate or notice number
A: +A?
Calibrator
Set point error
(mV or 3)
Relative value
Switching error
(mV or )
Actual maximum value
Appendix 3
JJG706—1990
Technical requirements for basic error, return error, set point error and switching error of instruments List of technical requirements for basic error, return error, set point error and switching error of instruments
Smoke level
No national program
Error (%)
Set according to the indicating scale
Set point
Error adjustment (%)
>[4emn. :14mo.
Note: The optical error is expressed as a percentage of the electrical range. 8
Allowable switching difference
Set according to the record scale
Allowable setting point
Error (%)
:140mm/> 140m:140
Xu Niu switching
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Long chart
(EW.FnEWFC)
-2.0 1 2.0
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EW.EEW.FO
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Appendix 2
Test form
Accuracy level
Test scale line
JJG 706—[990
Verification record format of automatic balance display meter with position control (control part)
Verification record of automatic balance display meter with position control (control part)
Set scale length
Model specification
Set temperature
Switch value (mV or)
A (mV or)
Set result:
Set item
Set range Curve
Set point error
Switching difference
Output-external
Relay resistance
Isolation blood deficiency
Popular test
Output-source
Output-input
Output-housing
Output power
Output-input
Set point error
Switching difference
Verification certificate or notice number
A: +A?
Tester
Set point error
(mV or 3)
Gan to leg
Tree switching difference
(mV or )
Actual extended value
Appendix 3
JJG706—1990
Instrument basic error,
Return course error, set point error, switching difference technical requirements list indicates
Smoke levelwwW.bzxz.Net
No national program
Error (%)
Set according to the indicated scale
Filling set point
Error (%)
>[4emn. :14mo.
Note: The optical error is expressed as a percentage of the electrical range. 8
Allowable switching difference
Set according to the record scale
Allowable setting point
Error (%)
:140mm/> 140m:140
Xu Niu switching
>ja0am
Long graph
(EW.FnEWFC)
-2.0 1 2.0
l0.51.00.751.5
EW.EEW.FO
±3.03.03.64.54.501 2n zx a
Appendix 2
Test form
Accuracy level
Test scale line
JJG 706—[990
Verification record format of automatic balance display meter with position control (control part)
Verification record of automatic balance display meter with position control (control part)
Set scale length
Model specification
Set temperature
Switch value (mV or)
A (mV or)
Set result:
Set item
Set range Curve
Set point error
Switching difference
Output-external
Relay resistance
Isolation blood deficiency
Popular test
Output-source
Output-input
Output-housing
Output power
Output-input
Set point error
Switching difference
Verification certificate or notice number
A: +A?
Tester
Set point error
(mV or 3)
Gan to leg
Tree switching difference
(mV or )
Actual extended value
Appendix 3
JJG706—1990
Instrument basic error,
Return course error, set point error, switching difference technical requirements list indicates
Smoke level
No national program
Error (%)
Set according to the indicated scale
Filling set point
Error (%)
>[4emn. :14mo.
Note: The optical error is expressed as a percentage of the electrical range. 8
Allowable switching difference
Set according to the record scale
Allowable setting point
Error (%)
:140mm/> 140m:140
Xu Niu switching
>ja0am
Long graph
(EW.FnEWFC)
-2.0 1 2.0
l0.51.00.751.5
EW.EEW.FO
±3.03.03.64.54.5
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