Some standard content:
VEC625.12.057:528.528
National Standard of the People's Republic of China
GB;T 12931-- 91
Sextant
Marine sextant
Published on May 22, 1991
Implemented on January 20, 1992
State Administration of Technical Supervision
National Standard of the People's Republic of ChinabzxZ.net
Navigational Sextant
Marlne sextant
Subject Content and Applicable Areas
GB/T12131-91
This standard specifies product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage, etc. This standard applies to the sextant (hereinafter referred to as sextant) used for measuring altitude and horizontal angles on the deck of a ship. 2 Reference standards
(191 Graphic symbols for transport
G1755 Fonts and symbols for optical instruments
Electron microscope and chemical process inspection
C·Quotation mark Electron microscope and chemical process inspection
C11765 Technical conditions for coating photography
C1088 Technical conditions for transport packaging of marine guided instruments 3 Product classification
9.1 Product model
Accuracy, !"
Angle measurement range,
Optical energy measurement position 3.2 The model, specifications and parameters of the product shall comply with the provisions of Table 1. The National Technical Bureau 199T05-22 approved the implementation of the 199202-01 test standard, the small wind value, the value of the performance, the institute was the main, the training value ratio. The technical requirements of GB/r1293191-3 ~ - 1sr should be able to work normally under the following environmental conditions: 4.1 The ambient temperature is -~-3-. - 130
b. Humidity environment is 2=2°C, relative humidity is 2%-10%. .26 minutes after the following environmental simulation test, it should be able to work normally: a. The test rate is 1.0H:, the probe is 1.4mm, and the test time is 2b; h. The real test rate is 1~2Hz, the acceleration value is 8, and the test time is 10min. The running value of the adjacent error should meet the requirements of Table 2. Table 2
GT.J13n-6i
4.4 The instrument is within the range of angle measurement. Its empty return error should meet the following requirements: GI.H130-60 type empty recognition error is not more than 20*; GLH13040 type indoor return error is not more than 10\, 2
GTHiau 21
GLHI3!n
GB/T12931-91
1.H130·2U The error of opening and closing the hole is not more than 5". 4.5 The error of magnification and field of view of the telescope is guaranteed. The upper limit of error is 5%. The lower deviation is 15%. 1.6 The error of pupil and distance of the telescope is guaranteed. The upper limit of error is 10%. 7 When using the color filter to observe the sun: the edge of the sun should be cut off, not too close to the eye, and no double shadow should be produced. 4. Sextant season The surface of the parts shall not have obvious damage, rust and fading. 4. The surface coating and chemical coating of metal parts of the sextant shall comply with the provisions of the general use regulations in HB7:5. The coating shall comply with the provisions of CB marine use.
.10 Screws, screws and other fasteners shall be loose, smooth and free of scratches. There shall be no obvious damage to the screwdriver and wrench holes.
4.11 The type and symbols of the sextant shall comply with the specifications of (B1785). The letters, lines and materials shall be clear, uniform and solid. 1.12 The surface of optical parts shall not have obvious scratches, pitting, cracks and other defects. 1.13 The front telescope shall not be viewed from the objective and ear direction. Cotton fibers, rust and shedding that may hinder observation are not allowed on the optical parts. 4.1 The moving parts of the sextant should be smooth, without looseness, jerkiness and jamming. The moving parts of the mechanical transmission should stay freely at any position of the stroke.
5 Test method
5.1 Product test
Test temperature 50±2℃, hold time 2h, temperature increase rate not more than 1:/, in the last 15min of the test, check according to 4.8, 10-4.14. After the test, place the sextant at room temperature for more than 3h, and the product performance should still meet the requirements of 3.2, 4.3, and 4.4. 5.2 Low temperature test
Test temperature 4h±2℃, hold time 2h, temperature increase rate not more than 1C/mlm. In the last 1%i1 of the test, check according to 4.8, 4.10~4.14. After the test, place the sextant under room temperature for more than 3 hours. The product performance should meet the requirements of 3.2, 4.3, and 4.1. 5.3 Heat test
The test temperature is 20=2, the test humidity is 925:-96%, and the test is carried out for 2 consecutive periods, each test cycle is 2:11. After the test, place the sextant under room temperature for more than 3 hours. The product performance should meet the requirements of 3, 4.3, and 4.4. 6.4 Vibration test
Put the sextant into the instrument box, fix the instrument on the vibration table 1., and carry out vibration test for 2 hours under the conditions of vibration frequency 1CHz and amplitude 1.4mm.
After the test, the product performance meets the requirements of 3.2, 4.3, and 4.4. 5.5 The sextant is placed in the instrument, the instrument box is fixed on the subject and closed, and the frequency shock test is carried out at a frequency of 1.2Hz and a speed of 7.1 seconds. After the test, the product performance should still meet the requirements of 3.2, 4.3, and 4-4. 5.6 The indication accuracy, relative error and empty error of the sextant must be guaranteed to be within 20+6 when the room temperature is measured, and the change of the error should not exceed 1°C/h. The sextant and the special calibrator under the room temperature should be kept at least 3 hours. The test work is carried out within the entire test range, and the test is carried out once every two stops. The difference in the same direction is used to form a recognition curve, and the difference between the quotient of the error curve and the lowest point is the indication accuracy. The value should meet the requirements of Table 1, the adjacent error should meet the requirements of Table 2, and the empty return error should meet the requirements of 4.4. 5.7 External inspection
Article 1.B, 4.10, 4.11, 4.12, 4.14, use visual inspection and feel inspection. 5.8 Quality of coating
The surface bond layer and chemical coating of metal parts shall be inspected according to CB·741: the coating shall be controlled according to the intermediate standard of C:F765, and shall meet the requirements of 4.9.
GBT12931--91
5. Article 4.7, use the sun as the sun mark: use visual inspection. 5.10 Article 4.13, use W incandescent bulb to illuminate, from the object of the telescope, in two directions of the eyepiece, visual inspection. 5.11 Inspection of optical performance of single-lens telescope
5.11.1 Visual magnification and error of actual magnification The visual diameter of the telescope is measured by a magnometer. The ratio of the effective aperture of the objective lens to the aperture diameter is the nominal magnification. The difference between the measured value of the visual magnification and the nominal value is the visual magnification error. 6.11.2 Field of view and nominal field error
The nominal field is measured by a wide-angle collimator with an angle value. The difference between the measured value of the nominal field and the nominal value is the nominal field error. 5.11.3 Error of aperture diameter and aperture point The aperture diameter of the telescope is measured by a collimator. The difference between the measured value of the pupil diameter and the nominal value is the aperture diameter error. .11.4 Exit distance and obstacle distance error
Use a magnification meter to measure the distance between the eyepiece and the pupil. This distance is the obstacle distance. The difference between the measured value and the nominal value is the exit pupil distance error.
8 Inspection rules
6.1 Factory inspection
6.1.1 Each sextant should be inspected for items 4.3, 4.1, 1.7-4.11 and indication accuracy, single telescope resolution, etc. 8.1.2 Any sextant from each batch of products should be inspected for items 4.5, 4.6. If there are any unqualified ones, re-inspect them. If there are any unqualified ones, report them for 100% inspection.
.2 Type Inspection
6.2.1 Type inspection should generally be carried out in any of the following situations: New products or old products are transferred to the factory for trial production and identification. After formal production, if the structure, materials, and process are greatly changed, it may affect the product performance. When the product is discontinued for a long time and production is resumed:
When the factory inspection results are significantly different from the previous type inspection: It should be carried out once a year.
8.2.2. Type inspection: 5 products of each batch of sextant of various types produced in a year shall be sampled, but not less than 5 sets. The inspection and test shall be carried out according to all technical requirements and test methods of this standard. If one of the sampled products does not meet the requirements, it shall be sampled twice for re-inspection. If there is any failure, the type inspection shall be considered unqualified. The samples that do not meet the requirements may still be sampled again after being re-tested.
Marking, packaging, transportation and storage
7.1 Marking
Each sextant shall have a nameplate. The contents on the nameplate include: b. Model and name of sextant;
F. Factory number;
D. Manufacturer's name.
7.2 Packaging and transportation
7.2.1 The exposed metal surface of the sextant should be cleaned with neutral grease, and then packed. The packaging and transportation should comply with the provisions of GB11035.
7.2.2 When transporting large sextants in batches, in addition to the general transportation requirements, the provisions of GB191 should also be followed. The packaging box should be printed with the signs of "safety, moisture-proof, and handle with care".
7.2.3 Accompanying documents
The accompanying documents should include the following documents:
a Factory Qualification Certificate or Specification Form
Instructions for Use.
2. Set
The sextant supplied as a set includes:
9, a sextant with a single mirror only:
Special tools and various parts.
GB/T12931-91
7.3.1 The rate room with a hole should comply with the provisions of C. 1932.7.2 When the six-pointer is stored in the rate room for a long time, it should be inspected and dry-treated every year. The surface of the inspection piece that has not been coated with gold should be treated with neutral grease
Additional remarks:
This standard is proposed by China Shipbuilding Industry Corporation. This standard was drafted by Changzhou Shooting Equipment Factory. The drafters of the standard are Sai Danying, Gu Kangfa, Zhang Muhua. From the date of implementation of this standard, the former China Shipbuilding Industry Corporation standard C1mm9-82 construction of general technical conditions for sea level gauges is used as the standard.
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