Some standard content:
Verification Regulation of DC Comparator Bridge
JIG 506—1987
Verification Regulation of DC Comparator Bridge
Verification in Regulation of D, C. Camparatnr Brldge
JJ50M—1987
This regulation was approved by the State Council in July 1987 and has been implemented since May 1986. Author: National Institute of Metrology
Original Unit: Jiangsu Provincial Metrology and Verification and Testing Institute The drafting unit is responsible for interpreting the technical provisions of this regulation. The main drafter of this regulation:
Yong (Heilongjiang Metrology Verification and Testing Institute)
Participating drafter:
Ji (Shanghai Electric)
Technical requirements
Inspection
Verification date
Verification method
Inspection of appearance and measuring function
Quantity and withstand voltage test
Measurement and display of magnetic level system indicators
Linearity evaluation and calculation.
Measurement of galvanometer system indicators
Verification||t t||Disposal of inspection results and inspection cycle
Appendix 1 Self-inspection of product linearity
Appendix 2 Example of measuring linearity
Appendix 3 Standard of linearity self-inspection calculation formula
Verification procedure of DC comparator bridge
This procedure is applicable to the determination of the resistance ratio of the measuring point, namely, the DC comparator bridge (commercial type light bridge or bridge) under the condition of neutralizing and arranging the DC current comparison bridge with only the primary and secondary potentials balanced and three potentials.
This procedure is not applicable to the verification of self-current comparator bridge. 1. Overview
comparator bridge is a self-flowing current comparator. When the magnetic potential is flat, the secondary section compares only the primary or secondary data, so that the current ratio of the primary measured resistor and the secondary standard resistor reaches the voltage balance of the two resistors, and the self-ratio is not equal to the digital ratio, and the commercial precision current is compared based on this. It is the same as the usual DC positive bridge, both of which are used to measure resistance, but the working principle is different: the former is replaced by the compensation measurement method (the latter is replaced by the disassembly measurement method, which completely overcomes the influence of the potential line and the terminal contact method, so as to compare the same nominal resistances (overcurrent transfer): the former is based on the premise of potential, and replaces the latter's resistance ratio with the matching ratio, so as to obtain a higher accuracy. The original circuit of the comparison bridge is shown in Figure 1. The primary variable winding has a potential balance, and the secondary has a fine-tuned fixed winding. Each winding has a fixed current. They generate a reverse magnetic potential in the core, which changes with the electric field: a charge:
W, a wind number:
! 1, a physical, current ||tt| |t electric heating
its combustion potential difference is detected by the winding, and it is passed to the manual alarm and the differential ring adjustment system to adjust the cycle. The secondary current produced by the driven (servo) circuit Iw
makes the potential balanced, that is, ".W", = (, W, so there is, w
h potential and
adjustment disk or secondary micro-control group (deviation disk), that is, adjust! / I., so that the galvanometer G pointer is equal, then the voltage drop on the scale, F, is equal, IRR,, so www.bzxz.net
is the current R. With the actual value of the ratio of the primary and secondary turns, the actual value of the measured current is equal to the actual value of the standard resistor. For example, the actual value of the primary and secondary turns is multiplied by the actual value of the ratio of the primary and secondary turns. If the set temperature is adjusted to W, which corresponds to the actual value of the standard resistor, the measured current value can be directly read from the disk. . 566
II According to the technical requirements
1 The accuracy level of the comparative bridge can be divided into C.001, 0.0002, 0.005 (i.e. 1, 2.m), and the accuracy level of different ranges can be different. 2 Under standard conditions,
Rent: 20=2%: Humidity: 25%~75%: Power supply voltage: standard voltage=5%: Power supply rate: nominal rate ±11H, after the time specified on the instruction card is heated, when the primary winding is not less than ten turns, the intrinsic error formula of the intermediate bridge is:
Where: Ei
The allowable detection limit of the intrinsic error (S):
The grade of the meter system:
Scale (measurement) indication ():
Base Value (), is the highest integer in each recording process; response number A during speed measurement):
voltage drop on the resistor during measurement (
potential balance error ():
potential balance error (.V):
and are calculated using the following formula:
=V (micropotential drift correction error) + (follow-up error) (magnetic acoustic error > Ay
1 (positive division value) + (shuttle meter drift output voltage + (galvanometer thickness acoustic stop error)
When the level is fixed at 10 coins and 1 turn, the first term in the formula is W20, 120mV, and the tracking is adjusted to a maximum of 1A (such as ≤40mV, the inspection system can only be measured after 1min of action, and the current must be left for a minimum of mir), the above-mentioned commercialization is: R
W2100: 8!
W, = 10: Fu: -±
W, -1 currency; 5-= 40
: Magnetic noise is the half of the current and the design difference. 1.05:
3 The secondary voltage is set to 1 winding and the velvet 10×1 voltage system. The value shall not be greater than 0W+4ww, and the slow signal
4 is based on the standard value of the disk. The linearity of the center, the nonlinear error of the test disk is calculated: 100
10.01Wx, WW is the value, the reference
difference is the non-load error "W~, their changes shall not be cute, for the number of turns, divided The number can be fine-tuned, but the adjustment period of the linear information must be less than the actual year. It is agreed that the relative nonlinear error of 100, 10, and 1 is not greater than the forbidden value. The peak value of the low magnetic potential is 3A·10:
6 potential zero drift is 20gA·104: 30m7m7 The internal current meter is attached: because there is no obvious mechanical vibration, the external resistance is 200, the voltage division value is 5mV/mm, and the collection element value is 0V. The thermoelectric change caused by the switch action of the meter is e10nV2. After the power supply and the primary and secondary circuits are disconnected, the insulation voltage between the primary circuit and the external circuit is removed: .0001. The number must be lower than 2K; 10. The effective voltage between the battery and the secondary winding and the shell can withstand 50Hz, [S0V actual positive combustion voltage history Three verification conditions: 11. The equipment to be verified in the standard conditions specified in Article 2 shall be used for commercial verification. The temperature system shall be 5m above 10 standard level. b. The temperature control temperature shall not be lower than 0.1. One constant temperature pool. d. Insulation resistance test (stand resistance) of 100-250V or high resistance bridge.Article 7 of the full number: one zeroing instrument (when the internal current meter or the internal current meter is not suitable): four calibration items
9 are shown in Table 1, and the calibration process can refer to Figure 2: 055 and 9920 types of simplified electric correction circuits, 13
external and measuring edge energy control
start and end
pressure test S
AT& seat value CA
need to coordinate and check the level 11 industry and secondary 1% of the five missing
meal quantity 103, 10, 1 regular equipment store
for Negative and negative phase
pull the meter to open the alternating potential
standard, the required quantity disk's natural degree:
: "+ standard standard, -" can be used for standard standard,
original period control
"zhi line division this year to seek fast standard, otherwise not with the quantity
Wang inspection method
Figure 2 compares the receiving bridge charging continuous circuit surrounding
total single open, in fact, to complete this line, 1, use the whole model switch and measure the level off room 14 external specifications inspection
out of the bridge panel receiving barrier has the virtual product name, model, Factory number, accuracy level, manufacturer name or trademark, manufacturing date, etc. Each knob and switch should have a mark to ensure proper use. Exposed parts should be completely aligned and can be locked by pressing the bottom of the chain. The rotation and switch should be able to turn to all working positions. Note the positioning. Clear. In addition to the new production of electrical parts, all other defects that do not affect the measurement function should be calibrated. The test of the measuring function will also be marked. The secondary length is 15 standard resistors and 1:1 measurement mirrors are connected to each end of the side pin and the relevant screws are turned up. In the measuring state, the camera indicator is opened after the needle is opened. : The lamp is actually glowing. If the indicator lamp is not attenuated, it should be checked carefully. The machine can be started again only after the correction factor (including wiring error) is eliminated. Under the limit current of 1Lim4, the error indicated by the AT meter should be within 2A. Adjust the indication of I test disk to IC, turn on the current detection disk, and the deviation disk can make the bridge stable. At this time, all the switches should have positive adjustment function. The indication values of the secondary and secondary current meters should be equal. [II] The insulation resistance of the bridge should be tested by the series quantity and the test base J6. After the insulation resistance is stable for 24 hours under standard conditions. For newly opened main power supply, the primary and secondary are connected in reverse, and the insulation resistance of the conductive parts of the product is measured with a 100-250V insulation resistance tester or a high-resistance tester. The difference should not be more than 20% under standard humidity conditions. The primary power supply is short-circuited, and the secondary power supply is disconnected from the circuit! , connect the high-voltage tester to the high-voltage burning group of the transformer, and the potential of the conductive parts outside the group must be connected. Apply the actual 15H sine wave voltage test. The test sequence is: the voltage drop is about WV
, and the commercial voltage tester should meet the relevant requirements of the product No. 44 version. The subsequent operating current is SmAe
: "Fx: No. 1 document: (high and low) the monitoring device has no special regulations or (test risks) of 5%. However, if the product is connected to the effective or receiving signal, if the rate is not up to the standard and the rate is not 30%, the team will use the vehicle size measurement, (three-level green system measurement
8 tunnel potential level new points should be
History bridge from! :1 measurement state into the ready state inspection! The following and the performance calibration starts from this state): according to the electric correction book will be the difference from the secondary to the level of the plate, and the mother plate reverse single connection * editing plan), and L are set to "" "East value at zero, no inspection teaching load deviation plate, thermal circuit current multiplication K: the current end of the material level, the secondary scale, not short-circuited, in order to promote the secondary current meter to open the circuit, flash connection external switch to "calibration", he also press the switch to become the evil on-off switch, and put it to "off", measurement switch to ten measurements if any), will be adjusted to zero adjustment and course tracking adjustment knob. In the 1st calibration state, put the read-out switch of the bridge to the reading position, adjust the range of the graded ammeter (meter: adjust the range to 100, make the special current adjustment button "1", the meter indicates 100tr4, use the special adjustment button (or inspection meter 7 drops); T meter pointer, etc., mark the seventh cloth with one, record the number of deflection grids (read to 0.1, the same below) and direction of the meter, such as 1 degree value ==, and determine that the meter is at this time "+", the inspected group continued to work as follows: Under normal circumstances, a 10A personality, (r2A/1 personality, the road must be adjusted or handled:
19 magnetic fast zero drift you my noise measurement disk
Under the above-mentioned state, obtain a certain time of preheating, the teacher current adjustment frequency stop, =, record the number of deflection grids of the double-case wheel e : Then Ca is the magnetic potential zero excitation shift of 3in. At the same time, observe the number of jitters of A meter, then +C is the peak value of the magnetic variable frequency. (IV) Find the self-test and meter
2 Automatic control of the load performance of the measuring disk
24.1 After the measurement of the potential drift between the measuring disks, turn the measuring disk and the deviation disk (especially the front disk of the fractional city) from beginning to end to the zero position, and change the meter range to 100m. After adjusting I-A, turn the power on and off for one disk, and leave the small value of -1 for the first and second disks in sequence: 2, 4), write down the number of scales or adjust the current (reducing the meter balance) knob to zero, and then turn the power on and off switch to "road", and the deviation scale of the A current and T meter are set. After all the disks are filtered Repeat the adjustment again, the average value of the two deviations corresponds to the sum, then the chain potential W=（）a, 4T meter is first adjusted to zero position, if there is a fractional blood micro-inquiry device, when the transition to the disk, if the change in the T meter indication before and after power-on is >2. It should be rounded. If there are two fractional measurement disks with micro-measurements, then the adjustment should be repeated once each time, and the effect after adjustment is used as the basis for the performance of the disk.
Record the measurement station results in the attached table [
according to the same difference to achieve the reverse deviation disk as the fractional fine-tuning, change the power and restore to the calibration state:
20.2 integer stop quantity on the disk than the change
this number is automatically placed on the table 1, and the disk comparison is carried out: the first disk and the other children's finger length are transferred to the largest value, and the reference group is from 1 1 indicates and the minimum value is sought when the base winding is reversed in series with the reference winding, that is, the detection value is 1, see Figure 2, in the environment of the minimum value, read the source switch when the center deviation number is "off" (or adjust it to the "4T" position) when the current is 1A. The table is displayed in the order of 1, 2, and the detection is completed. After the detection is completed, the minimum value is detected once. In the process of rotation, the power switch should be set to "off" to balance the magnetic potential when the action is in the north. AT table:
ear, turn the gear number user switch to self-calibration 2 and self-calibration 3, and use the same method to compare the disk with the melon disk
year: the indication value is the principle of the signal, and the drum is related to the inductive potential of the winding (%, AT When the table is adjusted to zero =
, record the test results of each disk in Appendix Table 2: 24, 3 external effect teachers measure the internal comparison of the empty disk
do not share the score of the group of scores measured by the disk alone for internal comparison, the total score is only the internal comparison of the disk with the largest value, because the error of the analysis is small and the result of the internal comparison of the disk, the internal comparison result of this disk is equal,
score disk has no single effect of the whole cable year, use the sum of the next disk indication as the "reference group" determined by the incremental replacement method, but the measured disk "1 indication value" has the same direction, in order to maintain the nominal value of the initial magnetic potential, it is necessary to make the measurement of the whole disk have the same original value as the measurement, under the condition of the bridge ditch calibration standard. , turn the read/calibrate switch to the reading, the fractional pressure disk 3, +1 disk and the secondary disk are equal in periodic step; the indication combination of the deviation disk is stepped out from 1 to 10 according to the rule in Table 3, and the inspection disk is replaced by the "reference winding" to form a "reference winding" potential change connection and stop, the deviation disk is related to the secondary gain and the number of -micro is output, read the T table deviation number of each indication combination under 1A current, which includes the "East end group" and the "Dong end group" and the "Dong end group" and the "Dong end group" respectively, and the "Dong end group" includes ...After the power is close to the power supply, the number is , and then the "reference group" is used. The indication group should be increased to 1, [, and the reading and deviation number 2 are then replaced by the reference filter number 2 by the tested winding 2, and the reference filter number is the warehouse, and so on. When the small value combination is changed, the power supply must be turned off and the current is overcurrent between the disks. The disk 1 value and the sum of the disk indications are compared, so -, 1·, directly give the transition between the disks,
The above-mentioned zero is recorded in Table 3. 2 Measuring disk self-test meter
21.1 Disk: The ratio of the indication value to the sum of the 10 indication values of the quantity K is calculated according to the Appendix Table 2 and Table 3. That is, the plate potential is compared with the reference group first! The potential difference W is calculated for the relative static positive value of the reference group, W is the disk overcurrent, and the measurement
=3: -
Note, =, can be used to verify the calculation and meet the 21.2 plate 0 this letter and other trust enough positive value low calculation, according to the appendix table "self-check just after the micro-seeking format, the first root plate through fatigue when the load needs 10 · show the creation and the right plate! The disk shows the appropriate magnetic potential desert: find out its relative value α [W" as the "enter the currency number, then Q = linear reference point! And 2 have been found, according to -, find, and then find! Find each
21.3 shallow parts static positive value calculation
plate The nonlinearity of the system itself is W+. If 1. The 6W2
of several coils, the linearity of the small coil must be intermediate, this is! The simple linearity of the Wei Ao is definitely not independent. It should be noted that the "performer" is not independent. The nonlinearity of the
ceramic group itself is corrected by the inverse number: AW (-)
The P value of each coil is replaced by the new P with the maximum number of steps: The cumulative force of the coil is:
WW (HQ)| |tt||Here is the algebraic value, part =: When, the above formula is summarized as: The small value itself is a nonlinear format, the number of coins is equal to ten; the value of the plate: the relative positive value of the value of the plate is equal to the sum of the small values of the plate, and the relative positive value of the sum of the small values of the plate is equal to the sum of the correction value of the small values of the plate! The plate is added, and the relative positive value of the sum of the small values of the plate is equal to the sum of the correction value of the small value of the plate, and the relative positive value of the ratio of the small value of the plate to the sum of its 10 values is equal to the sum of the small values of the plate. The sum of the indications is the sum of the three differences, where the sum of the indications is zero. Other formulas that are accurate to the actual situation may be used to calculate the measuring accuracy, but when the calculated data is not accurate, the calculation method specified in this specification shall be used as the reference.
22 Verification of the accuracy of the deviation disc
When the deviation disc is in the same condition as the nominal value, the disc shall be verified. In the state of fast filtering, the deviation and its nominal value shall be combined, and the same indication shall be obtained. Under the same indication, The method of separation takes the power supply in the "off" and "on" states and the current as the sum of the deviation scales (or zero position) of the TAAT meter, then the potential difference is
(-)(, so the first nonlinear correction effect of the deviation plate is: Za-Sw-o-docA
23 Measurement plate and difference plate indication variation section verification 23,1 In the standard preparation state, the measurement plate will show 10 indications or the plate has a large deviation. If a large deviation is found, put the corresponding indication of the difference plate. The nominal magnetic potential is 23.2A. Record the deviation number under 1A current. Turn on the current gradually. Do not stop. Turn the measuring disk back to the initial value after a period of time. Record the deviation number under 1A current again. This time, the maximum deviation is exceeded, and the measuring disk indication changes to W. Turn on the current gradually. Do not stop. Turn the measuring disk back to the initial value after a period of time. Record the deviation number under 1A current again. If the deviation is greater than 23.2A, the deviation indication changes to W. A24 primary 10×100 winding calibration
according to the expression of the marked voltage: Baoying takes the secondary winding as the standard for calibration. In the calibration preparation state, set the test bridge to change the level 1 turn reverse rotation effect to the marked level plate to keep the primary circuit closed, and the first "measurement back plate" shows a 10 value. Adjust the bridge (or galvanometer) to make the meter point to zero (closed). The meter is linear and its indication does not block the full value). 1A ( AT meter is nonlinear or its indication exceeds the required degree), record the fan reference number of AT meter eN, then the cutting number × 1OD, the correction number W for secondary D01 = MA, the relative difference is 25. The fixed measuring disk system group's reverse connection method is used for calibration. When preparing for calibration, find the relevant diagram of the seven-bridge system and connect the fixed 1, 10, 1 porcelain group with the measuring disk, and output 1 value respectively. The customer can purchase a fixed winding cable with a 1 value indication to achieve the average value. When the power switch is off, the AT meter indicates the current is 1A. When the power is turned off, the current at the lower end is 1A. The average scale is 0, 41, [100), 10, and the linear effective formula is W. W and W are respectively: ZW.o =emCA-A+AWI
AWU = awCArIIA+AW!,
AW,- Gar?AI AWll
Where: ,, are [,,,1] respectively, and are the nonlinear integers of the red value itself, Naw\, and so on.
can be accumulated as the end value symbol area, for example, AW, -26 shallow white grid results and the principle of judging the measurement of the holy disk: according to w to carry out the integration, when it is less than ten "micro" when the integration to! Micro craftsman. Use the scattered data after integration of 100
to shrink the linear correction value table, the fixed winding deviation disk part of the integration of the micro currency. Take the integrated number as the standard, their respective linear correction tolerance formula to judge whether it is the transmission grid. (V.) Measurement of galvanometer system indicators
27 Measurement of internal galvanometer indicators
The two green standard circuits in the structure of the numerical calibration preparation with a temperature change of 0. are divided into the initial correction and test levels, and the bridge is adjusted to enter the 1:1 measurement state under the 1-fold r current balance voltage complaint, when the power is on, the power is quickly turned on and the three coupons are not, 1V, the independent galvanometer is in the direct connection position of the load at the relevant place 1, change 1×1 gate of the transformer indication. , and generate an unbalanced voltage of .1 in the galvanometer circuit, adjust the photoelectric amplifier to reverse, and generate a 2m cursor rotation, then the voltage value Cw=5r.Vrrm: disconnect the current section and the limit adjustment position: disconnect the two standard resistors to separate the bridge potential system from the magnetic potential system, close the seven-side cover, record the source shift effect and the maximum jitter number of the galvanometer 10miu, and the product of them and (is the drift voltage and the current. 573
28 After the test, the bridge is in the state of separation of the two systems, adjust the open point of the galvanometer to zero or a certain scale line, stop the galvanometer from opening and closing, and record the above test value: then put the test switch in the off position, adjust the galvanometer to the original point. Zero point division line (when the open circuit point changes), then directly press the ammeter and record the deviation of the ammeter, repeat five times, find the maximum difference of the deviation of the ammeter, then e-Aa'v
Six) According to the precise test
29 electric exchange method overall verification
electric disassembly in the test electric value state, under the condition of electric gradient 4m, follow the case error 2, measure the two resistors in reverse position Ratio: First, measure the maximum ratio on the measuring plate (the deviation plate is zero), then replace the two positive connections, that is, R, and L, and replace them, keep the position of the electric fan in the oil mold unchanged, and then measure the resistance ratio of the corresponding position, and measure the ratio of the resistance on the measuring plate 1 (k + K) -13c as the test medium.
Take the ratio R:
can choose to use other force methods with a deviation greater than 0.3c% for the whole verification.3 0 Handling of the verification results
When the sub-item verification of each indicator of the bridge meets the technical requirements of this specification, the overall error of the bridge is not greater than the individual error, and the bridge is qualified.
When the sub-item verification results are inconsistent with the overall verification results, the verification conclusion: When the sub-item verification bridge is qualified but the overall verification is not qualified, the reason must be found out, and the verification results of some items must be repeated and the whole test must be repeated until the two are in agreement: When the sub-item verification bridge is unqualified but the overall verification is qualified, it is still unqualified, because the overall verification may not reflect all the error factors,
6. Handling of the verification results and the verification cycle
31 From the date of the inspection, it will be determined within one year, that is, during the warranty period, the inspection results of each item will meet the technical requirements of this regulation, and the bridge will be qualified within one month: If there is one unqualified item, the bridge will be unqualified, and the verification will be continued! The inspection of the axle is based on the technical calibration of the vehicle body to determine whether it is qualified.
3 Treatment of the inspection results outside the warranty period
32.1 The indicators of the items meet the requirements of this program, and the electric identification is qualified:.2. After 100 turns of continuity test, winding linearity test, if one or more of the parameters are unqualified, the bridge is not qualified, and the other parameters are unqualified or reduced by less than one-half of the specified parameters (insulated resistance is not less than half of the specified value). The bridge is still considered qualified, but the production certificate must indicate the number of cycles and the number of parameters. 32.3 If more than one index fails to meet the standard, if the continuous current of one or two indexes is less than half of the specified value (one times the specified value), the bridge is unqualified. The unqualified bridge can be downgraded and must meet the relevant requirements of the confirmed grade.
33 Bridge qualification certificate: The inspection station will issue a notice of unqualified results and indicate the reasons for unqualified. The data of the remaining items of inspection shall be given on the certificate or notice. The linearity shall be maintained at a fixed period of not more than 3 years, but the linearity can be fully inspected every two years, and the remaining two indicators can only be inspected for I and II sub-disks and fixed disks. 10 Linearity: The remaining linearity values can use the data in the original book or circular within the validity period of two years. For this reason, the certificate of the last inspection or the notification of the results must be brought with you when submitting for inspection.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.