Some standard content:
JJG495--1987 Verification Regulation for DC Magnetoretic Galvanometers JJG495--1987 Verification Regulation for DC Magnetoretic Galvanometers JJG495--1987 This verification regulation was approved by the Municipal Bureau of Measurement on March 9, 1973, and came into force on January 9, 1989. Responsible unit: Shanghai Municipal Bureau of Standards and Measurement Developing unit: Shanghai Metrology and Technical Research Institute The technical documents of this regulation shall be edited by the producing unit. This standard is drafted by: Shanghai Metrology Technology Research Institute! Additional drafter: Xia Weining (Shanghai Metrology Technology Research Institute) S2C Technical requirements Calibration (I) Calibration equipment [Ambient conditions Calibration items ... Calibration method V. Calibration result processing and calibration cycle II. Related terms ... 2. Measurement of electrical quantity division value or electrical quantity constant, magnetic flux division value or magnetic constant by electric method 5.2.2 Current This regulation is applicable to the newly manufactured and used square current galvanometers (hereinafter referred to as galvanometers) after neutralization and decompression. This regulation is not applicable to: No movable parts connected during the measurement process, such as photoelectric amplification galvanometers, electronically enlarged galvanometers and optical recorders; Special galvanometers attached to the measuring device: Galvanometers with a charge value greater than 1×110W/mm and a vibration period of less than 0.5a; Technical requirements 1 Appearance and markings The galvanometer should have: Factory name, model, shop number, graduation value or constant. External resistance, internal resistance, zero position invariance level, damping time or self-oscillation period and other indicators should not have defects that may cause measurement errors and damage. 2 Instruments
2.1 For the zero-point line inspection of the bidirectional scale, the zero adjuster should be able to move the indication line from zero to the left and right smoothly, and its value is:
2.1.1 The pointer type galvanometer should not be less than 3% of the total length of the working part of the scale. 2.1,2 The shoe-type light indicator type galvanometer should not be less than 25% of the total length of the working part of the scale. 2.1.3 The sub-assembly type light indicator dew type galvanometer certificate Not less than 50% of the total length of the working part of the scale. 2.2 For the unidirectional scale, the adjustment range of the zero value on the side of the scale should not be less than 3% of the total length of the working part of the scale (pointer type) and 25% of the total length of the working part of the scale (light indicator type). 2.3 For the galvanometer in use, the zero adjuster should be able to ensure that the indicator is adjusted to the zero graduation line. 2.4 When the galvanometer is in the specified tilting time, the zero adjuster should be able to adjust the indicator to the zero graduation line. 3.1 Check the value of the indicator leaving the zero graduation line of the scale when the indicator is tilted by 5 times from the specified working position to the front, back, left and right respectively. 3.2 The galvanometer with a level is not required to be used. 4. For the built-in galvanometer with scale, when the volts of the power supply are turned to the negative terminal of the galvanometer, the indicator should turn right from the zero scale line. 5. Current division value or current constant 5.1 Check the current dividing tube or current value of the galvanometer. If it is in accordance with the nominal value of the galvanometer, the allowable constant error is +10% of the nominal value. For the current meter in fast use, the allowable error is 5 times the nominal value: current division value or electrical system constant (ampere division or A mountain. When the current division value or electrical constant is required, the following formula can be used for calculation: 522
Control and type
Indicator reaches
Maximum=1×10
1×10- to ×10-
Also: Energy mass fraction energy is calculated according to the following formula: n - Ci(Re + Re)r, - K
The best quantity is the quantity of the medical component (matching the seat health with/au.: In: Ca—
internal (：
1 throw 21 external electric day (0):
C——electrical degree theft high monthly pass number (minutes straight tons Am); Tu——white Qi element weekly muscle (s);
F——1 minute medical Europe 1cun
C ChiRe + Re)
Where: y
Indicator road benefit large production price conversion
Scale working. All division length S%
Pregnant seat all working belt division 2% of the total length
Natural standard part length 50%
-voltage division value vertical voltage required number (optimum/division or V/mm). 1)
5.2 The current meter under the limit state estimates the power division or power required number, avoids the flow division value or avoids the adjustment band number, the maximum allowable evaluation deviation is the nominal elimination of the ± 10%. For the rectifier using three, the allowable deviation 5 times the nominal value. Electric quantity constant Cg (drop/division or (/mm); magnetic flux constant C. (dec/division or Wh/mm) 5.3 If the galvanometer is used as a shunt, the division value of the divider at two locations should be marked. The division value (number) when the galvanometer is used should meet the requirements of 5.1 or 5.2. 6 Uniformity
The maximum difference between the actual value of the galvanometer measured on the scale line should not be greater than 10% of its nominal value. || tt||Symmetry
7.1 For speed meters with a speed indicator, when the indicator deflects in the same direction, the two values shall not exceed 5% of the average value of the current.
7.2 For dual-integral and differential type meters, the indicator shall be connected in turn (other windings disconnected) in each group, and the requirements of 7.1 shall be met.
7.3 The symmetry of the indicator deflection on both sides of the zero graduation line of the scale shall not exceed 5%. 10% of the average deflection:
scale point teaching word small Ding or equal to 10.
7.3.2 galvanometer indicator indication number / Ding release equal to 107.3.3 energy division inverse value or energy disk constant less than 1 × 10-1 watt / division or Ws/mml: 7.3 + 4 internal magnetic grid galvanometer, uneven with the scale galvanometer. 8 consistent
differential change galvanometer two groups of the opposite thing, at the same time through a current (total size when any bypass is expected to switch 523
indicator deflection to the end of the division line of the electric class value! : At this time, the indicated rotation speed should not exceed 1n-m (when the distance between the scale and the needle is |m). If the distance between the scale and the needle exceeds 1m, such as 1.5m, it should not exceed 1.5mm. The indicator does not return to zero. The indicator indicator returns steadily to the graduation line of the end point of the scale, and the zero value of the indicator should not exceed the provisions of Table 2.
It should be located at the maximum allowable position of the variable grade
the maximum allowable position of the back indicator is not level (minutes) seat size difference (mm:
School proposal small variable net single
Note: International human table type logistics: The ground stop standard is equipped with a heavy dryer. The allowable distance is to be more than 1m at night. For the galvanometer in use, the indicator is not allowed to reduce the value by one grade every year.
10 Use time
101 The resistance time of the built-in galvanometer (under the critical state) of the scale should not exceed the provisions of Table 3. 10.2 The hanging wire or the hanging wire and the tip support of the built-in galvanometer should comply with the values specified in the technical conditions.
11 Self-oscillation cycle
Change the type of galvanometer
Use tension wire
galvanometer indicator The maximum value of zero
limit scale (quality) standard medical scale year to (m) 1.nwww.bzxz.net
can be set to cloud position or energy constant
sand/platform quality/nm
fire in 1-[0-1
1×10-14 to 1×10
the true separation period of the continuous type galvanometer, virtually in line with the value specified in its technical conditions. 12 External critical resistance
damping time
12.1 The external critical resistance of the galvanometer shall comply with the nominal value on the galvanometer: the compensation deviation is -20% of the nominal. For the galvanometer in use, the allowable deviation is =5% and% of the nominal value. 12.2 The actual current of the adjustable shunt), when the compensation shunt is not introduced, the external critical resistance box shall comply with the requirements of Clause 12.1. 12.3 The difference between the two currents of the differential detector shall not exceed 17% of the secondary resistance. 13.1: The internal resistance of the current detector shall meet the nominal value of the current detector. The allowable deviation is ±1% of the nominal value. 13.2 The difference of the internal resistance of the differential galvanometer shall not exceed ±5% of its average value. The influence of friction on the zero position of the adjustable magnetic shunt shall not exceed the value listed in Table 4 when the magnetic shunt is changed from one extreme position to another. Table 4
Measurement value or energy measurement
(ratio of pressure to -]
greater than or equal to ten: 13-1
Maximum value
indicates the maximum allowable current of the instrument
scale 1. 5% of the full scale of the standard part
10% of the length of the workpiece part
Measurement value of good position
greater than or equal to 110-110
indicates the allowable rotation of the whole person
standard working length
"Working part length 4
Adjustable fuel branch galvanometer, when the galvanometer is placed in the full inlet position and the resistance of the external circuit is equal to the damage, the maximum range of the indication station is 100%-150% of the rated rotation.
Under the condition of air temperature S7 and relative humidity not more than 8%, the insulation resistance of the galvanometer shall meet the requirements of Table 5.
Plant type
Needle type
Internal condensation type
Light-emitting device type
External installation
Note: In the calculation formula of insulation resistance, only the value of the product is used, 17 Insulation strength
Specified test parts
Recommended power station and shell
Measurement circuit and external element
Australia Electric and t Lighting Telecom
Lighting terminal and external force
Measurement circuit internal and external
And lighting circuit external
British and Chinese companies
2.5 x lo-3/t.,
2. 5 - LG *Cr
When the ambient temperature is 205 and the relative humidity is not more than %, the insulation strength of the galvanometer shall meet the requirements of Table 6. The test voltage is power frequency positive condensation. Table 6
Gauge type
Installation type
Installation type
(I) Calibration equipment
Specified test position
Lighting circuit
Measurement circuit and power station
Measurement circuit outside
Measurement circuit and light
|Hua Ming Circuit Pay Electric Power 5
Tai Ten 5 to 2.51
Same appearance
Speed Ling Voltage (V)
Two points
In the test set selected, the accuracy level of each standard should meet the requirements of the table. 18
Standard city equipment name
Electrical construction resistor (?
Point value (mA)
There are seven resistance foreheads
Specification (H)
3.01,0.1,1
x, t+1 + + + )
Minimum value is 0.1
Note: The value of each parameter is not less than 0:
No more than 1.0
No less than 0:2 years
II. Verification conditions
19 The scale value or band number of the galvanometer, the symmetry, consistency, the position of the pointer, the external critical voltage and the internal danger should be verified under the conditions specified in the verification. These conditions include: 19.1 The atmosphere of the galvanometer should be the same as the surrounding air. 9.2 The values of each parameter should be as shown in Table 8. 19.3 The indicator of the galvanometer should be adjusted to the scale value. 19.4 Verify that the meter is not affected by mechanical disturbances. 19.5 The galvanometer should eliminate leakage and parasitic potential in the measuring path, and should not have any electrical shadow. Working position Three verification items: More than 80% of the galvanometer has no external field and line characteristics, except for the combustion field. During the periodic verification of the galvanometer, the following inspections or measurements should be made: Appearance and markings: Regulator: C External critical resistance; d Free vibration period (impact galvanometer): e Graduation value or number: f Indicator is not zero position.
21 For newly manufactured or repaired galvanometers, in addition to the above items, the following items shall be added (after repair, the additional items may be determined based on the repair department) Standard measurement: Polarity:
h Effect of branch circuit on the position of the instrument
e Influence of actual inclination:
d Internal resistance:
e Relative time:
【Hook-up
8Relativeness;
Consistency:
iMaximum pulse 22 Measurement of the influence of inclination In the current working position, adjust the indicator of the zero-adjusting galvanometer to the zero graduation line, then tilt the galvanometer by 5° in the four directions of front, back, left and right, respectively record the deviation value of the indicator from the graduation line, and take the deviation value as the change of the indicator from the zero graduation line of the virtual scale. 23 Measurement of external resistance The measurement circuit is shown in Figure 1.
Raise the current to make the indicator deflect to 1/2 of the end dividing line, turn on switch K, observe the movement state of indicator 526
by means of occasional on and off, and read the indication of the indicator after the lack of movement. When the indicator returns to the raised position of the scale without swinging from 1/2 of the natural point dividing line, the indication of the electric box is the external critical resistance of the gauge:
At the same time, in order to determine the external critical resistance of
obtained in the figure: G micro-gauge: 1.5V single voltage range: R,, -phase reading t positioner (resistance value will not exceed .5k (about 72): R-micro resistor (10-10n0:1: state, can be moved R2 (The indicated value increases by 5%, this person has not checked the safety meter, a good dynamic library or other resistor; R, one hundred is the old period of electricity: when the indicator's movement state should be a micro-resistance K-blood channel change T switch, the same electricity with pregnancy * minimum TU.UU2: Ki, K, one is the thermal potential in the Ni state
switch: K-Jinlu people difference
measure the external critical resistance of a double-winding test ammeter or a dynamic structure
ammeter, the other one should be disconnected at the end. 24 The indicator does not return to the full value
according to the measurement circuit in Figure 1. The positive pin R, the indicated value is placed on the external resistance of the test ammeter to measure the value. The current rises to make the indicator turn to the end scale line, keep it for 5 minutes, reduce the current value to make the indicator return to the semi-stable sharing, and then disconnect." - The circuit reads the pointer after 1m and the value does not return to zero. For a bidirectional galvanometer, the value should be measured when the current stops and reverses, and the larger value should be taken as the zero value. For a galvanometer with a scale, the different values of the indicator should be calculated to the value when the distance between the scale and the moving mirror in front of the galvanometer is equal to 1m.
25 With some quantities
, the measurement should be carried out according to 1 meter. The resistance box R is placed on the outer critical function of the drum test gauge to measure the value, and the current is induced to make the galvanometer indicator deflect to The hourly scale line, when the switch is disconnected, the sand table is automatically turned on, and the indicator is measured from the end scale line to the zero scale line within 1 scale or 1mm. The measurement is repeated 3 times, and the half-mean value is taken as the control time of the ammeter.
26 Autonomous, the cycle quantity
is carried out according to the measurement circuit of Saint 1, the indication value of the voltage R is placed on the external critical resistance value of the galvanometer to be tested, and the current is increased to make the indicator of the galvanometer deflect to the end scale line, and then the switch K is disconnected, and the galvanometer is measured when the indicator is turned on. The time interval between two consecutive times when the indicator passes through the zero scale load in the same direction. Repeat the measurement three times and take the average value as the self-oscillation period of the galvanometer.
2 The measurement of the current scale value or the number of currents
27.1,1 is also carried out according to the circuit of 1. The resistance box is placed on the outer critical resistance of the galvanometer to measure the value. The selection of the standard resistor or the four-terminal inductor with a resistance of 100K should meet the formula R/(R+R) 0.005, R is: the core resistance and the outer critical resistance of the galvanometer respectively. 27.1.2 Raise the current chain indicator to the necessary scale line: record it as 01, and read the current of the milliammeter as 1. Then the current value is changed by switching the switch to change the current direction (the current value remains constant), and then the indicator is read at the center of the scale. The galvanometer with a unidirectional scale measures the deflection value in one direction. If the galvanometer has both a unidirectional scale and a bidirectional scale, the deflection values of the unidirectional scale and the bidirectional scale are measured in pairs. S7
Name.2 Deflection selection
27.2.1 For galvanometers with a scale end point graduation indicating a value of 10 or equal to 4 minutes (or mm), in addition to measuring at the full point, measurements should also be made at 1/4 of the end point. 27.2.2 For galvanometers with a scale end point graduation indicating a value greater than 10 but less than 20 divisions (mm), in addition to measuring at the end point graduation, measurements should also be made at a point not less than 10 divisions (or mm) above the end point. 27.2.3 For galvanometers with a scale end point graduation indicating a value less than 10 or equal to 10 divisions (or mm), only the end point graduation should be measured.
27.3 Calculation formula for current division value or current substitution 27.3.1 Calculation formula for current division value (standard, built-in galvanometer) Cr -
(ette2)
(R + R)
In the formula: -—Current division value (A/division; 1——Seventh standard (A;
R%—Standard resistance four-terminal resistor
RG—Galvanometer internal resistance [Q:
Rc:—Galvanometer external critical voltage (n2):
2 and 22 The deflection value of the zero division line of the internal scale of the indicator in two directions (division).27.3.2 The calculation formula of the current band number (scale division of the galvanometer) Rni.
Wu Zhong: G-
The current constant (A/):
—The vertical distance between the movable mirror of the scale and the galvanometer, and its value is expressed in units of machine: The rotation value of the zero division line of the indicator scale in each direction (u). a and,
The other symbols represent Formula (2).
27.4 Determination of current division or current constant The current constant is the arithmetic mean of the above measured values. 28 Calculation of the current constant (2)
After the current constant C is obtained by measuring the full cycle of the galvanometer and the seven division values, it can be calculated by the following formula: C. 2ToG,-0.3CT.
Where: -
The base of the natural logarithm, the approximate value is 2.718: (-electrical division value or electrical band number (cubic meters/division or C/mrn). 29 Calculation of the magnetic flux distribution
After measuring the critical current K and internal KG, it can be calculated by the following formula: +TeC(R + ke) = 0.433C, - To(RG / Re)Cα =
wherein: - magnetic field value or constant (Weber/nm or wh/nm) For other symbols, see formula (4):
30 symmetrical calculation
G juice calculation, where C is the maximum difference between the values obtained when the
current meter is at the same time
The current constant H is the maximum value between the values in the two directions of rotation according to the indicator, and α is the average value of the deflection in the two directions. 32 The measurement of internal resistance is shown in Figure 2. For the measurement, the current value that is raised makes the deflection of the indicator of the measured object not exceed the end scale line. The internal resistance of the bridge is: -
The maximum value of the measurement is carried out according to the circuit of Figure 1. First, the current detector is composed of: R, R, and R. The magnetic separator of the DC current meter is placed in the position of all small inputs, and the voltage is used to obtain the signal of the product 1
. When the indication value is zero, the entire current meter is raised by one. The indicator is turned to the position of the end scale line. Disconnect the switch K, and the indicator can be turned to the zero point. Close the switch K again, and the indicator will show the deflection of the first time. : The maximum resistance (percentage) of the test meter is calculated according to the following formula:
41×100%
Re-measure 3 times, and take the average value as the maximum resistance of the current bucket. 34 Measurement of insulation resistance
34.1 When measuring, use a high resistance meter with a standard voltage of more than 100V. 34.2 Measurement and connection According to Table 9, the measurement circuit system and the fiber optic circuit system shall be connected in accordance with the measurement method. All measuring terminals shall be connected with a meter. The capacity of the short circuit tester shall not be less than 0.25VA. The breakdown voltage is generally limited to SmA. Wiring shall be carried out in accordance with the method described above. The test voltage shall be increased at a rate of 100V/s. After reaching the rated voltage value, it shall be maintained for 1r. If no breakdown occurs, it is considered to be a continuous strength test. Then, under the condition of ensuring the accuracy of the verification, other verification methods other than those in this procedure are also allowed to be used. In case of data disputes, the method specified in this procedure shall prevail. V. Verification result processing and verification period
37 The verification data shall be recorded in the original verification record: 529
38. The verification variables shall be rounded up to 2500 effective numbers according to the rule of four or five. The verification specifications and standards shall be deduced based on the rounded data.
39 After control, the enterprise shall issue a verification certificate for the daily average compliance of the items. If there is any failure in the test month, the verification result notification shall be issued, and the reasons for the failure shall be clearly stated. Generally, no data shall be given in the verification certificate or verification result notification. 4. After the galvanometer is calibrated, it must be differentially sealed. 4.1. The calibration cycle of the galvanometer used in the test shall not be shorter than 2 years. As the galvanometer used by the instrument, the calibration period shall be determined according to the actual situation, and the longest shall not exceed 5 years. Appendix 1. Relevant terms
1. Current division value
scale built-in galvanometer, the current value represented by each unit division (ampere division): 2.
electric quantity value
scale built-in galvanometer, the electric quantity value represented by each unit division (volts/division). 3. Magnetic flux division value
scale built-in galvanometer, the magnetic flux value represented by each unit division (meters/division). 4. The current value represented by each mm when the distance between the scale and the movable mirror is less than 1m2 (A/mn)
5. The current value represented by each mm when the distance between the scale and the movable mirror is equal to I (c/mn)
6. The current value represented by each mm when the distance between the scale and the movable mirror is less than 1m2 (wb)
7. The deflection of the impact galvanometer after passing through the electric disk, Appendix 2. The electric quantity constant and magnetic flux constant of the electric disk measured by the electric method The circuit of the galvanometer is shown in the figure. 1.1 The value indicated by the galvanometer and the DC resistance of the secondary winding of the standard circuit are equal to the value of the critical voltage of the galvanometer under test. The value obtained by the comparison is: the critical voltage (I) is obtained by the comparison of the two circuits shown in Figure 1. 1.2 After the current is raised, turn on the switch K, and at the same time: observe the value indicated by the galvanometer, and then turn off the switch K to make the indicator return to the zero scale line. The adjusted voltage can make the indicator's gradient value exceed the 12 end scale line. 1.3 Turn on the switch Ks, read the value of the indicator group on one side of the scale and record it as a", and the voltage value is recorded as4 Determination of current division or current constant The current constant is the arithmetic mean of the above measured values. 28 Calculation of the current constant (2)
After the current constant C is obtained from the full cycle of the galvanometer, the following formula can be used for calculation: C. 2ToG,-0.3CT.
Where: -
The base of the natural logarithm, the approximate value is 2.718: (- the current division value or the number of current bands (C/division or C/mrn). 29 Calculation of the magnetic flux distribution
After the critical current K and internal KG are obtained, the following formula can be used for calculation: +TeC(R + ke) = 0.433C, - To(RG / Re)Cα =
Where: - magnetic field value or constant (Weber/minute or wh/nm) For other symbols, see formula (4):
30 Calculation of
G, where C is the maximum difference between the values obtained when the
current meter is at the same time
, and the maximum value between the values of the current constant H is obtained when the indicator is turned in the two directions. α is the average value of the deflection in the two directions. 32 Measurement of internal resistance
Measurement port drop Figure 2 Indicator,
measurement, the current value raised makes the deflection of the indicator under test not exceed the end scale line, the blue bridge level, internal resistance: ratio. -
maximum pick-up measurement is carried out according to the circuit of Figure 1. First, the current detector?
consists of: R, R, and R. The magnetic separator of the DC current meter is placed in the position of all small inputs, and the electrical signal is obtained by using 1
. When the indication value is zero, the whole current meter
is raised by one.
makes the indicator turn to the position of the end scale line. Disconnect the switch K, and the indicator can change to zero. Close the switch K for the second time, and the indicator will indicate the deflection of the first current. : The maximum value (percentage) of the test meter is calculated according to the following formula: 41×100% 3 times the measurement, and the average value is taken as the maximum current carrying capacity of the insulation. 34 Measurement of insulation resistance 34.1 When measuring, use a high resistance meter with a standard voltage of more than 100V. 34.2 Measure the connection according to Table 9. Measure the current and fiber optic circuit system. High-voltage test. All measurements are short-circuited. The indicator is replaced by a short-circuit tester. All measuring terminals are connected to the meter and the tester is used. The capacity is not less than 0.25VA and the breakdown voltage is generally limited to SmA. Wiring is done according to the method. The test voltage is increased by 100V/s and maintained for 1r after reaching the rated voltage value. If there is no breakdown, it is considered to be a continuous strength test. Under the condition of ensuring the accuracy of the verification, other verification methods outside this procedure are also allowed. In case of dispute over the data, the method specified in this procedure shall prevail. 5. Processing of test results and verification period
37 The test data should be recorded in the original test record: 529
38. The test variables should be rounded up to 2000 effective numbers according to the rule of 450. The test specifications and standards should be deduced based on the rounded data.
39 After the test, the enterprise shall issue the test report if the daily average of the test items is in compliance. If there is any failure, the test result notification shall be issued every month, and the reasons for failure shall be clearly stated. Generally, no data will be given in the verification certificate or the test result notification. 4. After the galvanometer is calibrated, it must be differentially sealed. 4.1. The calibration cycle of the galvanometer used in the test shall not be shorter than 2 years. As the galvanometer used by the instrument, the calibration period shall be determined according to the actual situation, and the longest shall not exceed 5 years. Appendix 1. Relevant terms
1. Current division value
scale built-in galvanometer, the current value represented by each unit division (ampere division): 2.
electric quantity value
scale built-in galvanometer, the electric quantity value represented by each unit division (volts/division). 3. Magnetic flux division value
scale built-in galvanometer, the magnetic flux value represented by each unit division (meters/division). 4. The current value represented by each mm when the distance between the scale and the movable mirror is less than 1m2 (A/mn)
5. The current value represented by each mm when the distance between the scale and the movable mirror is equal to I (c/mn)
6. The current value represented by each mm when the distance between the scale and the movable mirror is less than 1m2 (wb)
7. The deflection of the impact galvanometer after passing through the electric disk, Appendix 2. The electric quantity constant and magnetic flux constant of the electric disk measured by the electric method The circuit of the galvanometer is shown in the figure. 1.1 The value indicated by the galvanometer and the DC resistance of the secondary winding of the standard circuit are equal to the value of the critical voltage of the galvanometer under test. The value obtained by the comparison is: the critical voltage (I) is obtained by the comparison of the two circuits shown in Figure 1. 1.2 After the current is raised, turn on the switch K, and at the same time: observe the value indicated by the galvanometer, and then turn off the switch K to make the indicator return to the zero scale line. The adjusted voltage can make the indicator's gradient value exceed the 12 end scale line. 1.3 Turn on the switch Ks, read the value of the indicator group on one side of the scale and record it as a", and the voltage value is recorded as4 Determination of current division or current constant The current constant is the arithmetic mean of the above measured values. 28 Calculation of the current constant (2)
After the current constant C is obtained from the full cycle of the galvanometer, the following formula can be used for calculation: C. 2ToG,-0.3CT.
Where: -
The base of the natural logarithm, the approximate value is 2.718: (- the current division value or the number of current bands (C/division or C/mrn). 29 Calculation of the magnetic flux distribution
After the critical current K and internal KG are obtained, the following formula can be used for calculation: +TeC(R + ke) = 0.433C, - To(RG / Re)Cα =
Where: - magnetic field value or constant (Weber/minute or wh/nm) For other symbols, see formula (4):
30 Calculation of
G, where C is the maximum difference between the values obtained when the
current meter is at the same time
, and the maximum value between the values of the current constant H is obtained when the indicator is turned in the two directions. α is the average value of the deflection in the two directions. 32 Measurement of internal resistance
Measurement port drop Figure 2 Indicator,
measurement, the current value raised makes the deflection of the indicator under test not exceed the end scale line, the blue bridge level, internal resistance: ratio. -
maximum pick-up measurement is carried out according to the circuit of Figure 1. First, the current detector?
consists of: R, R, and R. The magnetic separator of the DC current meter is placed in the position of all small inputs, and the electrical signal is obtained by using 1
. When the indication value is zero, the whole current meter
is raised by one.
makes the indicator turn to the position of the end scale line. Disconnect the switch K, and the indicator can change to zero. Close the switch K for the second time, and the indicator will indicate the deflection of the first current. : The maximum value (percentage) of the test meter is calculated according to the following formula: 41×100% 3 times the measurement, and the average value is taken as the maximum current carrying capacity of the insulation. 34 Measurement of insulation resistance 34.1 When measuring, use a high resistance meter with a standard voltage of more than 100V. 34.2 Measure the connection according to Table 9. Measure the current and fiber optic circuit system. High-voltage test. All measurements are short-circuited. The indicator is replaced by a short-circuit tester. All measuring terminals are connected to the meter and the tester is used. The capacity is not less than 0.25VA and the breakdown voltage is generally limited to SmA. Wiring is done according to the method. The test voltage is increased by 100V/s and maintained for 1r after reaching the rated voltage value. If there is no breakdown, it is considered to be a continuous strength test. Under the condition of ensuring the accuracy of the verification, other verification methods outside this procedure are also allowed. In case of dispute over the data, the method specified in this procedure shall prevail. 5. Processing of test results and verification period
37 The test data should be recorded in the original test record: 529
38. The test variables should be rounded up to 2000 effective numbers according to the rule of 450. The test specifications and standards should be deduced based on the rounded data.
39 After the test, the enterprise shall issue the test report if the daily average of the test items is in compliance. If there is any failure, the test result notification shall be issued every month, and the reasons for failure shall be clearly stated. Generally, no data will be given in the verification certificate or the test result notification. 4. After the galvanometer is calibrated, it must be differentially sealed. 4.1. The calibration cycle of the galvanometer used in the test shall not be shorter than 2 years. As the galvanometer used by the instrument, the calibration period shall be determined according to the actual situation, and the longest shall not exceed 5 years. Appendix 1. Relevant terms
1. Current division value
scale built-in galvanometer, the current value represented by each unit division (ampere division): 2.
electric quantity value
scale built-in galvanometer, the electric quantity value represented by each unit division (volts/division). 3. Magnetic flux division value
scale built-in galvanometer, the magnetic flux value represented by each unit division (meters/division). 4. The current value represented by each mm when the distance between the scale and the movable mirror is less than 1m2 (A/mn)
5. The current value represented by each mm when the distance between the scale and the movable mirror is equal to I (c/mn)
6. The current value represented by each mm when the distance between the scale and the movable mirror is less than 1m2 (wb)
7. The deflection of the impact galvanometer after passing through the electric disk, Appendix 2. The electric quantity constant and magnetic flux constant of the electric disk measured by the electric method The circuit of the galvanometer is shown in the figure. 1.1 The value indicated by the galvanometer and the DC resistance of the secondary winding of the standard circuit are equal to the value of the critical voltage of the galvanometer under test. The value obtained by the comparison is: the critical voltage (I) is obtained by the comparison of the two circuits shown in Figure 1. 1.2 After the current is raised, turn on the switch K, and at the same time: observe the value indicated by the galvanometer, and then turn off the switch K to make the indicator return to the zero scale line. The adjusted voltage can make the indicator's gradient value exceed the 12 end scale line. 1.3 Turn on the switch Ks, read the value of the indicator group on one side of the scale and record it as a", and the voltage value is recorded as25VA and high-altitude tester, the breakdown voltage is generally limited to SmA. Wiring is carried out according to the previous method. The test voltage is increased by 100V/s, and maintained for 1rir after reaching the rated voltage value. If there is no breakdown, it is considered to be a continuous strength test standard. Then, under the condition that the verification is confirmed, other verification methods other than this procedure are also allowed. In case of data disputes, the method specified in this procedure shall prevail. V. Verification result processing and verification period
37 The verification data shall be recorded in the original verification record: 529
38. The verification variables shall be rounded up to 2 figures according to the four-five rule. The verification standards and percentages shall be deduced based on the rounded data.
39 After control, the enterprise shall issue the verification report for the daily average compliance of the items. If there is a failure to complete the test within a month, a notice of the results will be issued, and the reasons for the failure will be clearly stated. In the verification certificate or the verification result notice, data is generally not given. 4. After the galvanometer is calibrated, a differential seal must be added. 4. The galvanometer used in the test: its calibration cycle shall generally not be shorter than 2 years. As a galvanometer used in the state, the calibration period shall be determined according to the actual situation, and the longest shall not exceed 5 years. Appendix 1 Related terms
1 Current division value
scale built-in galvanometer, the current value represented by each unit division (ampere division): 2
Electric quantity value
scale built-in galvanometer, the electric quantity value represented by each unit division (volts/division). 3 Magnetic flux division value
scale built-in galvanometer, the magnetic flux value represented by each unit division (meters/division). 4. The current value represented by each mm when the distance between the scale and the movable mirror is less than 1m2 (A/mn)
5. The current value represented by each mm when the distance between the scale and the movable mirror is equal to I (c/mn)
6. The current value represented by each mm when the distance between the scale and the movable mirror is less than 1m2 (wb)
7. The deflection of the impact galvanometer after passing through the electric disk, Appendix 2. The electric quantity constant and magnetic flux constant of the electric disk measured by the electric method The circuit of the galvanometer is shown in the figure. 1.1 The value indicated by the galvanometer and the DC resistance of the secondary winding of the standard circuit are equal to the value of the critical voltage of the galvanometer under test. The value obtained by the comparison is: the critical voltage (I) is obtained by the comparison of the two circuits shown in Figure 1. 1.2 After the current is raised, turn on the switch K, and at the same time: observe the value indicated by the galvanometer, and then turn off the switch K to make the indicator return to the zero scale line. The adjusted voltage can make the indicator's gradient value exceed the 12 end scale line. 1.3 Turn on the switch Ks, read the value of the indicator group on one side of the scale and record it as a", and the voltage value is recorded as25VA and high-altitude tester, the breakdown voltage is generally limited to SmA. Wiring is carried out according to the previous method. The test voltage is increased by 100V/s, and maintained for 1rir after reaching the rated voltage value. If there is no breakdown, it is considered to be a continuous strength test standard. Then, under the condition that the verification is confirmed, other verification methods other than this procedure are also allowed. In case of data disputes, the method specified in this procedure shall prevail. V. Verification result processing and verification period
37 The verification data shall be recorded in the original verification record: 529
38. The verification variables shall be rounded up to 2 figures according to the four-five rule. The verification standards and percentages shall be deduced based on the rounded data.
39 After control, the enterprise shall issue the verification report for the daily average compliance of the items. If there is a failure to complete the test within a month, a notice of the results will be issued, and the reasons for the failure will be clearly stated. In the verification certificate or the verification result notice, data is generally not given. 4. After the galvanometer is calibrated, a differential seal must be added. 4. The galvanometer used in the test: its calibration cycle shall generally not be shorter than 2 years. As a galvanometer used in the state, the calibration period shall be determined according to the actual situation, and the longest shall not exceed 5 years. Appendix 1 Related terms
1 Current division value
scale built-in galvanometer, the current value represented by each unit division (ampere division): 2
Electric quantity value
scale built-in galvanometer, the electric quantity value represented by each unit division (volts/division). 3 Magnetic flux division value
scale built-in galvanometer, the magnetic flux value represented by each unit division (meters/division). 4. The current value represented by each mm when the distance between the scale and the movable mirror is less than 1m2 (A/mn)
5. The current value represented by each mm when the distance between the scale and the movable mirror is equal to I (c/mn)
6. The current value represented by each mm when the distance between the scale and the movable mirror is less than 1m2 (wb)
7. The deflection of the impact galvanometer after passing through the electric disk, Appendix 2. The electric quantity constant and magnetic flux constant of the electric disk measured by the electric method The circuit of the galvanometer is shown in the figure. 1.1 The value indicated by the galvanometer and the DC resistance of the secondary winding of the standard circuit are equal to the value of the critical voltage of the galvanometer under test. The value obtained by the comparison is: the critical voltage (I) is obtained by the comparison of the two circuits shown in Figure 1. 1.2 After the current is raised, turn on the switch K, and at the same time: observe the value indicated by the galvanometer, and then turn off the switch K to make the indicator return to the zero scale line. The adjusted voltage can make the indicator's gradient value exceed the 12 end scale line. 1.3 Turn on the switch Ks, read the value of the indicator group on one side of the scale and record it as a", and the voltage value is recorded as
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