Some standard content:
Light Industry Industry Standard of the People's Republic of China
Mechanical stopwatch
1 Subject content and scope of application
QB/T1534-1992
This standard specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of mechanical stopwatches. This standard applies to mechanical stopwatches with fork-type picking and lifting mechanisms for measuring time intervals. 2 Reference standards
GB/T2828 Batch inspection counting sampling procedures and sampling tables (applicable to inspection of continuous batches) GB/T2829 Periodic inspection counting sampling procedures and sampling tables (applicable to inspection of production process stability) QB/T1535 Mechanical alarm clock
3 Product classification
3.1 Stopwatch classification
3.1.1 According to the number of time intervals measured simultaneously: single needle and double needle. 3.7.2 According to whether there is a cumulative time interval measurement mechanism: with pause and without pause. 3.2 Basic parameters
3.2.1 The second hand of the stopwatch has a jump value of 0.01, 0.02, 0.1, and 0.2s. 3.2.2 According to the timekeeping accuracy, the quality level of the stopwatch can be divided into three levels: excellent, first-class, and qualified. 4 Technical requirements
The stopwatch should not stop when working at an ambient temperature of -10-~40℃. 4.1
4.2 The stopwatch should not stop when working in any position. 4.3 The quality level of the stopwatch and the average minute time difference, minute time deviation, and maximum second time difference requirements under the following environmental conditions are shown in Table 1. a.
Temperature: 20±5℃;
Relative humidity: 30%~80%;
Atmospheric pressure: 83992.86~106657.60Pa (630~800mmHg). Table 1
Second hand jump value
Average minute time difference 1\, min
Approved by the Ministry of Light Industry of the People's Republic of China on July 6, 1992
Minute time deviation"\, min
Maximum second time difference", s
Implemented on March 1, 1993
Second hand jump value
QB/T 1534-1992
Continued Table 1
Average minute time difference\, min
Minute time deviation\, min
Note: 1) Average minute time difference: the average value of the algebraic sum of the minute time differences measured within the specified time interval. 2) Minute time deviation: the difference between the minute time difference measured at any time within the specified time interval and the average minute time difference. 3) Maximum second running time difference: the maximum value of the second running time difference measured at the test position and within the specified time interval. 4.4 After the stopwatch is fully wound once, its continued running time is shown in Table 2. Table 2
Second hand jump value s
4.5 The winding mechanism of the stopwatch must ensure that it can wind up the spring smoothly and reliably. 3
Maximum second running time difference\, 5
Continued running time, h
4.6 When the spring is completely relaxed, after the winding handle rotates three times, the stopwatch should start automatically immediately when the start button is pressed. 4.7 The start, stop and return to zero actions of the second hand should be completed by pressing the button once each. 4.8 The width of the second hand indicator tip is shown in Table 3. Table 3
Quality Grade
Width of the Second Hand Indicator Tip
4.9 The second hand indicator tip must be bent toward the dial, and the overlap length with the scale line shall not be greater than three-quarters of the length of the short scale line at most, and shall not be equal to zero at least.
4.10 The offset of the second hand from the zero position of the dial after returning to zero shall not exceed a minimum scale value. 4.11 The indication values of the minute hand and the second hand shall be compatible. When the second hand passes through the zero position, the error of the corresponding minute hand indication value shall not exceed one-third of the minimum scale.
4.12 The main and auxiliary second hands of a double-hand stopwatch must have a unified indication, and no indication difference is allowed. 4.13 The minimum scale line width of the dial shall not be greater than 0.10mm. 4.14 There shall be obvious numbers and scales on the dial, and the minimum value shall be consistent with the jump value of the second hand (except for special stopwatches). 4.15 The stopwatch must have an adjustment device for adjusting the vibration period of the balance wheel to reduce the absolute value of the stopwatch's average error. The marks (+) and (-) must be printed on the movement's balance plate. The adjustment range is shown in Table 4. The deviation of the stopwatch's speed hand relative to the middle scale line should not exceed half of its limit value when leaving the factory. 212
Quasi-thermal network
m concept standard value, s
QB/T 1534—1992
In 6 hours ≥45 s
In 12 hours ≥90 s
4.16 The stopwatch movement must be firmly fixed in the watch case. The movement should not be loose when winding or pressing the button. 4.17 The watch glass should be tightly installed in the front ring and cannot be turned by hand. The glass of the stopwatch must be clean and transparent, and must not have any defects that hinder the observation of the reading and time indication, or any defects that damage the appearance of the stopwatch. 4.18
The coating requirements for the case, back cover, bezel, crown, handle ring, and button are as follows: they should have good corrosion resistance;
they should have good bonding strength:
no discoloration, no rust spots, and no defects that affect the appearance. 5 Test methods
5.1 Stopwatch travel accuracy: tests of average minute travel time difference, minute travel time deviation, and maximum second travel time difference. 5.1.1 The stopwatch should be tested under the environmental conditions specified in Article 4.3. 5.1.2 Test position: dial face up and winding handle up. 5.1.3 See Table 5 for the test instruments and equipment, specifications and accuracy for stopwatch calibration. Table 5
Instruments and equipment
Stopwatch tester
Electric heating blower
Low temperature box
The number of tests and the test time interval are shown in Table 6. Grade
Second hand jump value
Test time interval
Specifications and accuracy
10～300℃
20～0℃
±2℃
Number of tests
Second hand jump value
QB/T 1534—1992
Continued Table 6
Test time interval
Number of tests
After fully winding the spring, the comparison between the second hand and the standard time should be carried out within the time specified in Table 7. If the specified time is exceeded, the spring should be fully wound again. 5.1.5
Running time, h
Comparison starts
20 s after each start
3 min after each start
Note: The comparison of the double-hand stopwatch is carried out when both hands move simultaneously. Specified time
20 min
5.1.6 The automatic start and stop device in the stopwatch calibrator must ensure that the stopwatch can be calibrated normally in the vertical and horizontal positions. The start and stop of the stopwatch are automatically carried out by the stopwatch calibrator through the control signal. 5.1.7 The average running time difference Mmi is calculated according to the test position in 5.1.2 according to formula (1): Mmin
Where: Mmin—the running time difference of the stopwatch in the first test (i-1,2,3**n), sn——the number of tests;
—the algebraic sum of the running time differences of 1 to n times, s. 5.1.8 The minute running time difference is calculated according to formula (2):
E Mmini - Mmin
Where: E——
minute running time deviation, S
minute running time difference of the stopwatch in the ith test, s; average minute running time difference, S
5.1.9 Average minute running time difference, minute running time deviation and maximum second running time difference shall comply with the requirements of Article 4.3. (1)
.......(2)
5.2 The continuous running time of the stopwatch is measured by the time interval from the start of the mechanism to the stop of the mechanism after the spring is fully wound. It shall comply with the requirements of Article 4.4. The test position is with the dial facing up. In a two-hand stopwatch, the secondary second hand is not allowed to stop. 5.3 When testing according to the requirements of Article 4.1, after fully winding up the stopwatch, stop it and put it in an electric heating bellows box at 40±5℃. For stopwatches with second hand jump values of 0.01, 0.02, 0.1, and 0.2s, keep them for 4, 4.6, and 6 hours respectively, then start them and keep them for 0.5, 1.5, 6, and 12 hours. Then take them out of the electric heating bellows box and cool them to room temperature. Rewind the stopwatch and stop it. Then put it in a low temperature box at -10℃±5℃, keep them for 4, 4, 6, and 6 hours respectively, then start them and keep them for 0.5, 1.5, 6, and 12 hours respectively. The stopwatch must not stop. 5.4 For 4.5.4.6, 4.9, 4.12.4.14, 4.16, 4.17, 4.18, 4.19c. Under the illumination of a 40W fluorescent lamp, at a distance of 33cm from the stopwatch, use visual inspection and hand feel to check whether the stopwatch meets the requirements. The back cover should not be opened during the inspection. 5.5 When testing according to the requirements of 4.7, press the winding handle cap or the corresponding button to make the second hand return to zero 50 times, and it should meet the requirements. 5.6 When testing according to the requirements of 4.8 and 4.13, a tool microscope or other instruments with the same accuracy should be used for testing. 5.7 When testing according to the requirements of 4.10, the second hand should be returned to zero five times from any position for inspection. 5.8 When testing according to the requirements of 4.11, start the stopwatch, and when the minute hand passes through four different minute scales, press the winding handle cap to make the second hand stop at zero for comparison.
5.9 Open the back cover and check the stopwatch by visual inspection to see whether it meets the requirements of 4.15. 5.10 When the corrosion resistance test is carried out according to the requirements of Article 4.19a, it shall be carried out according to Article 5.8.3 of QB/T1535. 5.11 When the bonding strength test is carried out according to the requirements of Article 4.19h, it shall be carried out according to Article 5.8.5 of QB/T1535. 6 Inspection rules
6.1 Factory inspection
6.1.1 Factory inspection shall be carried out according to GB/T2828. 6.1.2 Batch range 151~280.281~500, 501~1200.1201~3200. 6.1.3 Inspection items, sampling plan, inspection level and qualified quality level are shown in Table 8. Table 8
Unqualified categories "Serial number
Inspection items
Average minute time difference
Timekeeping accuracy
Minute time deviation
Maximum second time difference
Timekeeping duration
Winding is not flexible, cannot start automatically
Start, stop, return to zero action cannot be completed by pressing the button once. The offset of the second hand exceeds a minimum scale value. The second and minute hand indication values are not consistent
The watch glass is loose in the front ringbzxZ.net
Appearance quality
Sampling plan
Normal inspection
Sub-hot sample plan
Inspection level
Qualified quality level
General inspection level
Corresponding clauses
4.18,4.19c
6. 1.4 After the batch of factory inspection has passed various tests, if any one item fails, the batch of products will be judged as unqualified. The batch that fails the factory inspection should be returned to the manufacturer, and when it is submitted for inspection again, a stricter inspection must be carried out. 6.2 Type inspection
6.2.1 Type inspection shall be carried out in accordance with GB/T2829. Its inspection items, sampling plan, discrimination level and unqualified quality level are shown in Table 9.215
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Inspection Items
Average running time difference
Running time accuracy Running time deviation
Maximum running time difference in seconds
Running time duration
Stop at any position
Winding is not flexible and cannot start automatically
QB/T 15341992
Start, stop and return to zero actions cannot be completed by pressing the button once
The deviation of the second hand exceeds a minimum scale value when the ambient temperature is -10 to 40℃
The deviation of the speed hand relative to the middle scale line exceeds 1/2 of the limit value
The movement of the watch is not stable in the case
The indication values of the second and minute hands are not consistent
The watch glass is loose in the previous figure
Appearance quality
Sampling
Unqualified
Quality level
Number of judgments
Unqualified
Number of judgments
Corresponding clauses
4.12.4.13,
4.14.4.18,
6 .2.2 After the type inspection, if all items are qualified, the product is judged to have passed the type inspection. If there is one item in category B or category C that is unqualified, it shall be judged to be unqualified.
When the type inspection is unqualified, the product shall be stopped from being delivered, and it can only be delivered after rectification until the new type inspection is qualified. 6.2.3 Samples that have passed the type inspection cannot be shipped as qualified products. 6.2.4 The cycle of type inspection is generally once a year. 7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 The dial of the stopwatch must be marked with the manufacturer's name and trademark. 7.1.2 Each stopwatch movement must be printed with: manufacturer's trademark;
manufacturing year code;
product code.
7.1.3 Export stopwatches are allowed to print marks or codes according to the contract of the foreign trade ordering department. 7.2 Packaging
7.2.1 Each stopwatch must be packed in a separate box, and the box should also contain the instruction manual and certificate. The certificate should be marked with the product name, model, standard name, standard number, accuracy level, year and month of production, stamp of the inspector and the inspector code. 7.2.2 For boxes containing single stopwatches, put every ten into a cardboard box and wrap them with moisture-proof paper. 216
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QB/T 1534-- 1992
The packaged stopwatches should be packed in a box with anti-bearing materials to reduce vibration during transportation. The following content (corresponding symbols can also be used) should be printed on each packaging box: consignor and consignee;
precision instrument;
handle with care;
d. Afraid of moisture;
Measuring instrument production license code.
7.3 Transportation and storage
7.3.1 During transportation, the stopwatch should be handled with care, and should not be squeezed, collided or strongly vibrated, and should not be exposed to moisture. 7.3.2
Stopwatches should not be placed together with corrosive gases and magnetic materials during transportation and storage. 7.3.3 Stopwatches should be stored in a warehouse with a temperature of 0~30℃ and a relative air humidity of no more than 80%. Additional notes:
This standard was proposed by the Quality Standards Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Clock and Watch Standardization Center. This standard was drafted by the Shanghai Stopwatch Factory. The main drafters of this standard are Wang Baofang and Li Wanping. This standard refers to the Soviet national standard rOCT5072--1979 "Mechanical Stopwatch". Standardization and elimination network
Classification cabinet industry information free downloadcom name standard industry data width. Free download unqualified
Inspection items
Average time difference
Time accuracy minute time deviation
Maximum time difference in seconds
Time duration
Stop at any position
Winding is not flexible, cannot start automatically
QB/T 15341992
Start, stop, return to zero action cannot be completed by pressing the button once
The offset of the second hand exceeds a minimum scale value. Stop at an ambient temperature of -10 to 40℃
The offset of the fast and slow hands relative to the middle scale line exceeds 1/3 of the limit value 2
The movement of the watch is not stable in the watch case
The indication values of the second and minute hands are not consistent
The watch glass is loose in the previous figure
Appearance quality
Sampling
Unqualified
Quality level
Determination number
Unqualified
Determination number
Corresponding clauses
4.12.4.13,
4.14.4.18,
6.2.2After the type inspection, if all items are qualified, the product is judged to have passed the type inspection. If there is one item unqualified in category B or category C, it should be judged to be unqualified.
If the type inspection fails, the product should be stopped from being delivered, and it can only be delivered after rectification until the new type inspection passes. 6.2.3 Samples that have passed type inspection cannot be shipped as qualified products. 6.2.4 The cycle of type inspection is generally once a year. 7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 The dial of the stopwatch must be marked with the manufacturer's name and trademark. 7.1.2 The movement of each stopwatch must be printed with: manufacturer's trademark;
manufacturing year code;
product code.
7.1.3 Export stopwatches are allowed to print marks or codes according to the contract of the foreign trade ordering department. 7.2 Packaging
7.2.1 Each stopwatch must be packed in a separate box, and the box should also contain the instruction manual and certificate. The certificate should be marked with the product name, model, standard name, standard number, accuracy level, year and month of manufacture, seal of the inspector and the inspector's code. 7.2.2 For boxes containing single stopwatches, put every ten into a cardboard box and wrap them with moisture-proof paper. 7.2.3 QB/T 1534-- 1992 The packaged stopwatches should be placed in a box with anti-bearing pads to reduce vibration during transportation. The following information should be printed on each package box (corresponding symbols can also be used): consignor and consignee; precision instrument; handle with care; d. afraid of moisture; code of the production license of measuring instruments. 7.3 Transportation and storage 7.3.1 During transportation, stopwatches should be handled with care, and should not be squeezed, collided or strongly vibrated, and moisture should be avoided. 7.3.2
Stopwatches must not be placed together with corrosive gases and magnetic materials during transportation and storage. 7.3.3 Stopwatches should be stored in warehouses with a temperature of 0~30℃ and a relative humidity of no more than 80%. Additional notes:
This standard is proposed by the Quality Standards Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Clock and Watch Standardization Center. This standard was drafted by the Shanghai Stopwatch Factory. The main drafters of this standard are Wang Baofang and Li Wanping. This standard refers to the Soviet national standard rOCT5072--1979 "Mechanical Stopwatch". Standardization and elimination network
Classification cabinet industry information free downloadcom name standard industry data width. Free download unqualified
Inspection items
Average time difference
Time accuracy minute time deviation
Maximum time difference in seconds
Time duration
Stop at any position
Winding is not flexible, cannot start automatically
QB/T 15341992
Start, stop, return to zero action cannot be completed by pressing the button once
The offset of the second hand exceeds a minimum scale value. Stop at an ambient temperature of -10 to 40℃
The offset of the fast and slow hands relative to the middle scale line exceeds 1/3 of the limit value 2
The movement of the watch is not stable in the watch case
The indication values of the second and minute hands are not consistent
The watch glass is loose in the previous figure
Appearance quality
Sampling
Unqualified
Quality level
Determination number
Unqualified
Determination number
Corresponding clauses
4.12.4.13,
4.14.4.18,
6.2.2After the type inspection, if all items are qualified, the product is judged to have passed the type inspection. If there is one item unqualified in category B or category C, it should be judged to be unqualified.
If the type inspection fails, the product should be stopped from being delivered, and it can only be delivered after rectification until the new type inspection passes. 6.2.3 Samples that have passed type inspection cannot be shipped as qualified products. 6.2.4 The cycle of type inspection is generally once a year. 7 Marking, packaging, transportation and storage
7.1 Marking
7.1.1 The dial of the stopwatch must be marked with the manufacturer's name and trademark. 7.1.2 The movement of each stopwatch must be printed with: manufacturer's trademark;
manufacturing year code;
product code.
7.1.3 Export stopwatches are allowed to print marks or codes according to the contract of the foreign trade ordering department. 7.2 Packaging
7.2.1 Each stopwatch must be packed in a separate box, and the box should also contain the instruction manual and certificate. The certificate should be marked with the product name, model, standard name, standard number, accuracy level, year and month of manufacture, seal of the inspector and the inspector's code. 7.2.2 For boxes containing single stopwatches, put every ten into a cardboard box and wrap them with moisture-proof paper. 7.2.3 QB/T 1534-- 1992 The packaged stopwatches should be placed in a box with anti-bearing pads to reduce vibration during transportation. The following information should be printed on each package box (corresponding symbols can also be used): consignor and consignee; precision instrument; handle with care; d. afraid of moisture; code of the production license of measuring instruments. 7.3 Transportation and storage 7.3.1 During transportation, stopwatches should be handled with care, and should not be squeezed, collided or strongly vibrated, and moisture should be avoided. 7.3.2
Stopwatches must not be placed together with corrosive gases and magnetic materials during transportation and storage. 7.3.3 Stopwatches should be stored in warehouses with a temperature of 0~30℃ and a relative humidity of no more than 80%. Additional notes:
This standard is proposed by the Quality Standards Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Clock and Watch Standardization Center. This standard was drafted by the Shanghai Stopwatch Factory. The main drafters of this standard are Wang Baofang and Li Wanping. This standard refers to the Soviet national standard rOCT5072--1979 "Mechanical Stopwatch". Standardization and elimination network
Classification cabinet industry information free download
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