GB/T 14108-1993 General technical requirements for Class A marine magnetic compasses
Some standard content:
t:pc. 629. 12. 053. 1
National Standard of the People's Republic of China
GB/T1410893
General specifications for marineA class magnetic compass
Published on January 21, 1993
Implemented on August 1, 1993
Published by the State Administration of Technical Supervision
W.National Standard of the People's Republic of China
General specifications far marineA class magnelic compass
1 Subject content and scope of application
GB/T14108-93
Generation G133896-83
H3897.-83
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation, storage, etc. of Class A liquid magnetic compass for marine use.
This standard does not apply to type 10 magnetic compasses.
2 Reference standards
GB2423.16 Basic environmental test procedures for electrical and electronic products Test J: Long-term test method GB2423.17 Basic environmental test procedures for electrical and electronic products Test Ka: Salt spray test method (133898 Terminology of magnetic compass
GB12267 Remote control navigation equipment requirements and test methods CB765 Technical conditions for coating coatings
CB 1038 Technical conditions for transport packaging of marine navigation instruments CB3023 Plates and signs for marine electrical equipment and instruments 3 Terms and codes
The terms and codes used in this standard are in accordance with the provisions of GB3898. 4 Technical requirements
4. 1 The imager should be able to work normally under the following environmental conditions. 4. The ambient temperature of the basin is -30~60℃ (4℃ with humidity, vibration, salt spray and mildew).
4.2 Temperature requirements
Unless otherwise specified, all technical requirements are under the temperature of 20±3℃. 4.3 Basin and half frame
4.3.1 Appearance of the basin
The basin should be free of damage and mechanically intact. The liquid should be colorless, not turbid, and without flocculent precipitation. The basin should be There should be no leakage, and the coating inside the compass bowl and on the dial should be free of cracks and bubbles. 4.3.2 Pre-setting force of the precision steel of the pointing system
The magnetic steel of the pointing system should be a magnetic material with high magnetic resistance, and its correction force should be greater than 18000A/14.3.3 Non-magnetic materials
In the compass, except for the steel of the pointing system and the sensor of the repeater, all other materials used should be non-magnetic materials. Approved by the State Bureau of Technical Supervision on January 21, 1993, August 1993 01 Implementation
W.4.3.4 Number of baselines
GB/T 14108-93
Each compass shall be equipped with a bow baseline (main bow baseline) indicating the bow direction, which shall be clearly distinguishable within 0.5' of the normal bow and stern line direction. Other baselines indicating the stern or left and right directions may be installed, but they shall also meet the requirements of 4.3.5 to 4.3.7. 4.3.5 The distance between the bow baseline and the outer edge of the compass disk The distance between the bow baseline and the edge of the compass disk shall be between 1.5 and 3.0 mm, and the projected longitude shall be between 0.5 and 1.5 m. 4.3.6 The width of the bow baseline
The width of the baseline shall not be greater than 0.5% of the disk division. 4. 3.7 Visibility of bow baseline
When the compass is tilted 10° or the hemispherical compass is tilted 30°, the compass reading should be able to be read from the bow baseline at the maneuvering position. The compass equipped with a gimbal is allowed to use the ship's base plate. 4.3.8 Repeating system
The repeating system should not affect the reading of the compass disk and the determination of navigation with the azimuth reading instrument. 4.3.9 Relationship between the edge of the compass disk and the axis tip When the orientation ring and the azimuth reading instrument are both horizontal, the compass disk, the axis tip and the bow baseline (if it is a point) and the outer gimbal axis should be on the same horizontal plane with the compass basin with an error of no more than 1mm. 4.3.10 Relationship between the two gimbal axes
The angle between the inner and outer gimbal axes should be 90°±1°, and the two vertical planes passing through the gimbal axis should intersect within 1mm from the axis tip. All end play shall be such that it is not out of tolerance. 4.3-11 Thickness of top and bottom glass
When made of non-tempered glass, the thickness of the glass of the compass (including the hemispherical compass bowl) shall be at least 4.5 mm. When tempered glass is used, its thickness shall be at least 3 mm. When a material other than glass is used, its strength shall be equivalent to that of non-tempered glass 4.5 mm thick. 4.3.12 Water level
When the gimbal ring is kept horizontal, the compass bowl shall be balanced with its set ring or top glass stable within 2\ of the horizontal plane, regardless of whether the azimuth reading instrument, accessories or magnifier are installed.
4.3.13 Friction of internal gimbal shaft
When the gimbal ring is kept horizontal, the compass bowl shall be able to return to within 2\ of the horizontal plane when the gimbal ring is tilted 5\. 4.3.14 Degrees of freedom of motion of compass
When the gimbal ring is horizontal, the compass bowl should be able to rotate freely up to 40° around the inner ring axis. The same type of bearings should be used for the inner and outer gimbal shafts. 4.3-15 Moment of inertia
The moments of inertia of the pointing system about all horizontal axes passing through the shaft tip and the jewel bearing surface are substantially equal. 4.3.16 Degrees of freedom of the pointing system of the hemispherical compass In a compass without gimbal support, the freedom of the pointing system in any direction should be greater than 30°. 4.3.17 Degrees of inclination of the pointing system
When the compass bowl is tilted 10° in any direction, the pointing system should remain free in its position. 4.3.18 Magnetic moment of the magnet of the pointing system
The magnetic moment of the magnet of the pointing system should be greater than the value given in the figure below. 2
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GB/T14108-93
Use count:, mm
4.3.19 Length of magnet in pointing system
The length of magnet in pointing system shall not exceed 85 mm. 4.3.20 Centering of shaft tip
The deviation of shaft tip from the vertical line passing through the center of the inner diameter of the compass shall not exceed 0.2 mm14.3.21 Height of pivot bearing
If the polar bearing is installed with a vertical spring bracket, the height of shaft tip shall be such that the pointing system is completely immersed in the liquid. 4.3.22 Half period of compass
The half period of the compass system shall be greater than /2600/Hs. H is the horizontal component of the magnetic flux density at the test site, which is nT (the same below). 4.3.23 The recovery time after the strong magnetic field or non-periodic magnetic field of the compass is not more than /57600/1s. 4-3-24 Support force
When the compass disk diameter is equal to or less than 135mm, the force applied by the finger system to the pivot bearing in the compass fluid should be between 0.04~0.10N, and when the disk diameter is greater than 165m, it should be between 0.04~0.14N. 4.3.25 The horizontal response of the vertical magnetic flux density to the pointing system After the balanced pointing system is installed in the compass basin, its inclination angle is not more than: east-west, 0.5°-north, (0.510.038)* is the absolute value of the algebraic difference between the values of the vertical magnetic flux density in T at one location and another location. 4.3.26 Graduation of the compass disk
The compass disk shall be graduated in degrees, starting from 000° or 360° from the north and read clockwise from top to bottom. 3
WG/714108—93
Every 10° shall be indicated by a corresponding number, and the principal point bearing may also be marked. In addition, the north point may be indicated by a suitable symbol. When the two sides of the disk are scaled, their scales shall overlap within a tolerance of 0.2°. 4.3.27 Readability of the compass disk
A person with normal vision shall be able to clearly read the scale lines, numbers and words on the disk at a distance of 1.4 m2 from the driving compass under sunlight or artificial light.
Reflection and segment compasses. A person with normal vision can clearly see and read the compass sector image of the bow baseline and its two sides of 15 degrees at a distance of 1m from the periscope under sunlight and artificial light. The use of a magnifying plate is allowed. 4.3.28 Graduation of relative bearing ring
If the compass is equipped with a relative bearing ring to measure the bearing relative to the bow, the scale should be divided into 360° in the clockwise direction and marked with a two-digit number every 10 degrees, so that when observed by the bearing reading instrument, 000 is the bow direction. 4.3.29 Pointing error
The pointing error shall not be greater than 0 on any course.5%. Pointing error is the structural error of the pointing system and consists of the following: azimuth error of the pointing system relative to the lower dial scale (alignment error); H.
1. Compass longitude scale error:
c. The eccentricity of the longitude scale scale relative to the center of rotation of the dial. In a repeater compass, the pointing error is the pointing error of the longitude without a sensor. No matter how the sensor in the repeater compass is placed, the impact on the compass pointing system is less than 0.5% at any time. The heading indicated by the main compass and the repeater is not more than 0.54.3.30 Bow baseline error
The bow baseline error should not be greater than 0.5°.
The bow baseline error is a structural error of the compass and the gimbal, which depends on the relative position of the ship's baseline, the axle and the direction of the gimbal's longitudinal axis.
4.3.31 Friction error
The friction error of a magnetic compass is no less than (3/H). 4.3.32 Eddy error
When the compass rotates at a speed of 6°/s, the eddy error should not be greater than (180/13°). When the compass rotates at a speed of 1.5°/s: when the true diameter of the dial is greater than T or less than 200mm, the full-motion error is not greater than (54/H)%; when the dial diameter is less than 200mm, the false motion error is not greater than (36/11). 4.3.33 Inductive error (referring to the arrangement of magnetic steel) The inductive error of the magnetic compass, that is, the ratio of the coefficient H to the coefficient D, is not greater than 0.08. 4.3.34 Centering of the azimuth reading instrument
The distance between the rotation axis of the azimuth reading instrument (bridge or ring type) and the vertical rotation axis of the compass dial that has been subjected to axle correction is not greater than. Emrm.
4.3.35 The eccentricity error of the azimuth scale The vertical line passing through the center of the azimuth scale should be within the range of 1.5mm from the axis tip. 4.3.38 Manufacturing report The manufacturer shall submit a written report including those requirements that cannot be checked in other tests. This report shall include the following points: Coercivity of the magnetic steel of the pointing system The internal kneading of the compass basin must be of good quality and must not deteriorate or render the compass unusable (for example, fading or bubbling of the coating will not reduce the clarity of the graduations) within two years, even if the temperature varies within the range of 30 to 60 degrees or due to any other reasons: W.bzsoso: comd. GR/T 14108—93
Under the conditions described in h, the compass fluid will not change color significantly, making the compass unusable; the strength of the glass or non-tempered glass material used on the top and bottom of the compass basin; the compass plate material will not deform; the rotation of the pointing system for all horizontal axes passing through the shaft tip and plate bearings is basically equal, the vertical distance between the magnetic surface of the pointing system and the gimbal line; the bearing on the tip at 20°C
The same model of the inner and outer bearings!
The length of the contact rod or magnetic ring that constitutes the pointing system. 4.4 Compass cabinet and correction device
4.4. 1A1 compass analysis and correction device
The design and production of the A1 compass should ensure that the distance between the guide steel of the compass pointing system and the lower surface of the compass base is greater than 1.Um. 4.4. 1.1 Materials
Except for the correction device (including some parts of the repeater system), the binnacle and its accessories can only be made of non-abrasive materials that meet certain strength requirements. 4.4.1.2 Installation and Installation
When the binnacle is tilted by 40° in any direction, the gimbal orientation ring shall remain within 2° of the horizontal plane. It shall also ensure that the compass does not move out of position under any climatic conditions.
4.4.1.3 Friction of the gimbal axis and the compass bowl axis When the compass is tilted by 5° in any direction, it shall be within 2° of the horizontal plane after returning to the horizontal state. 4.4.1.4 Distance between the gimbal axis and the axis
The longitudinal movement of the gimbal axis in its bearing shall not exceed 0.5 mm. 4.4.1.5 The horizontal movement of the spring-suspended gimbal and the horizontal movement of the gimbal in any direction from the normal position shall not exceed 5 mm. 4.4.1.6 The bearing reading shall only be affected by the spring-suspended compass. The vertical displacement of the center of the compass basin caused by the weight of the bearing reading instrument shall not exceed 3 mm. 4.4.1.7 Accuracy of longitudinal markings
The fore and aft markings shown on the binnacle shall be in the same straightening plane as the longitudinal axis of the gimbal, with an error not greater than 0.5°. A rod shall be provided in the binnacle to enable the compass plate to be rotated to correct any misalignment relative to the longitudinal line of the ship, with the correction angle being between 4° and 5°.
4.4.1.8 The compass heading read from the projected and reflected images shall be consistent with the heading read from the bow station line, with an error not greater than 0.5°. 4.4.1.9 Correction magnets shall be made of magnetic materials with high surface magnetism and a correction force of not less than 18,000 A/m. The soft iron correction material shall have a high magnetic permeability and a coercivity not greater than 160 A/m and negligible residual magnetism. The pointing end of the correction magnet shall be marked with a red color and a suitable pin (e.g. a scale) to indicate the position of the correction device. The holes or slots for the horizontal correction magnet shall be numbered.
4.4.1.10 Calibration energy and position of the water half correction magnet The energy of the correction factor B and factor C of the water half correction magnet shall be greater than I(1350/H)° When the pointing system is in the form of a tape gauge, the horizontal correction magnet and the slot used shall ensure that the distance between the water half correction magnet and the magnet of the pointing system is greater than twice the length of the horizontal correction magnet. 4.4.1.11 The alignment of the auxiliary lines of the horizontal calibration magnet pot should be different. The distance between the auxiliary lines of the horizontal calibration magnet pot and the burning direction and the direction of the external gimbal or its perpendicular line should not be less than 2". The direction of the magnet should also be within 2° of the horizontal plane.
4.4.1.12 The position error of the horizontal calibration magnet The midpoints of the conventional longitudinal and transverse half calibration magnets should be located in the vertical plane passing through the transverse and longitudinal axes of the gimbal respectively, and the error should not be greater than 5tum
GB/T 14108—93
4.4.1.13 Tilt error correction magnet
The tilt error correction magnet should be able to generate a vertical magnetic flux density of 75~+75%T at the magnet position of the pointing system. 4.4.1.14 If there is no special equipment for the support device of the tilt error correction magnet, the tube of the tilt error correction magnet should be installed on the vertical bull's eye line of the compass cabinet under the compass basin. And the tilt error correction magnets should be arranged symmetrically, and the distance between the upper end of the tilt error correction magnet and the magnet of the pointing system should be greater than twice the length of the correction magnet.
4.4.1 .15 Quadrant H error correction device and correction energy The compass should be equipped with a quadrant white error correction device, and the energy of the correction coefficient D should be greater than 10°. When the compass cabinet is placed vertically, the deviation between the horizontal plane of symmetry of the device and the plane of the center of the magnetic steel of the pointing system is not more than 15mm. And the device can move along the radial direction of the compass cabinet in the direction of its axis. The error between the device and the horizontal axis of the gimbal is not more than 10°. 4.4.1-16 Correction range of the Versailles bar
The compass cabinet should be equipped with a Versailles bar correction device. The energy of the correction coefficient B caused by the vertical magnetic field should be greater than 15. The magnetic inclination of the test site is 67".
4.4.1.17 Position of the Versailles bar
The 1/12 length of the top of the Versailles bar should be located in the horizontal plane of the magnetic steel of the pointing system, with an error of not more than 10mm. The distance between the vertical axis of the Forsyth rod and the center of the pointing system should be greater than 250mm. If a hollow Forsyth rod is used, the diameter of its hole should not exceed 40% of the outer diameter. 4.4.1.18 Forsyth angle
The error between the vertical line from the center of the compass pointing system to the axis of the Forsyth rod and the vertical angle in the direction of the longitudinal axis of the gimbal should not exceed 2°. 4.4.1.19 Correction line
If the ship is equipped with a micro-diagram, the binnacle should have a position convenient for installing the correction coil. 4.4.1.20 Lighting equipment
The binnacle should have equipment for illuminating the dial using the ship's power supply and emergency light sources. In projection and reflection binnacles, they should be able to provide a clear image for observation at the operator's position. Devices for adjusting the light are allowed to adjust the lighting at the operator's position and in the binnacle. Bulbs, plugs, sockets, switches, dimming devices and circuits, whether powered or not, should not have magnetic influence on any part of the compass. 4.4.1-21 Manufacturer's report
The manufacturer shall submit a written report including those requirements that cannot be verified during the type test. This report shall include the following points:
The vertical distance between the center of the magnet and the center of the gimbal bearing of the compass pointing system mentioned above; b. Except for the correction device (including certain parts of the repeater system), the binnacle and accessories shall not use magnetic materials. When the compass shell is made of natural wood, it shall be air-dried tropical hardwood (such as teak). If any other wood is used for the binnacle, it shall be weathered hardwood or marine board. When other than wood is used, its characteristics shall be stated; all materials used shall be of sufficient strength; d.
Correction of correction magnets;
Soft correction materials shall have only high conductivity and coercivity not exceeding 160A/m and negligible residual magnetism; f.
| When wooden parts are connected only by adhesive, indicate the type of adhesive used. 4.4.2 Type A2 binnacle and calibration device
4.4.2.1 It shall comply with the provisions of 4.1.1.1 to 4.4.1.6; 4.4.1.8 to 4.4.1.9, 4.4.1.11, 4.4.1.12, 4.4.1.19 to 4.4.1.21. 4.4.2.2 Accuracy of longitudinal markings
The fore and aft line marks of the binnacle shall be in the vertical plane of the longitudinal axis of the gimbal, with a deviation of no more than 0.5%. 4.4.2.3 Correction and position of horizontal correction magnet The energy of correction coefficient B and coefficient C of horizontal correction magnet should be greater than (1350/11)°6
W.GB/T 14108-93
However, the horizontal correction magnet should not be too close to the pointing system to avoid magnetic field distortion. When the compass cabinet is tilted or tilted by 15\, the white error produced in any heading should not be greater than (40/H). 4.4.2.4 Tilt error correction magnet
should comply with the provisions of 4.4, 1.13 and 4.4.1.11. Constant tilt error correction magnet should not be too close to the pointing system to avoid field distortion. When the compass cabinet is tilted or tilted by 15\, the white error produced in any heading should not be greater than (80/H). 4.4.2.5 Quadrant white aberration correction device
If there is a quadrant white aberration correction device, the correction coefficient D should be greater than 7°. It should comply with the provisions of Article 4.4.1.15. 4.4.2.6 Forsyth bar
If there is a Forsyth device, it should comply with the provisions of Articles 4.4.1.17 and 4.4.1.18. 4.5 Azimuth reading instrument
4.5.1 Types of azimuth reading instrument
Class I: Sight (plastic telescope-sight). It can accurately aim at a long-distance target. Category: Azimuth mirror (spindle mirror - field mirror type). It can measure low-precision azimuth when the yaw angle is not greater than 5\. Category: Dummy compass. This dummy compass can be used alone or in conjunction with the A2 compass. Regardless of the size and position of the A2 compass plate, the dummy compass can be used to measure the difficult-to-measure azimuth. 4.5.2 Non-magnetic materials
All parts of the azimuth reading instrument should be made of non-magnetic materials. 4.5.3 Installation on the compass
The azimuth reading instrument should be able to rotate freely on the H compass 1 used, and the reading error caused by movement should not be greater than 0.2 4.5.4 Accuracy of bubble level
The bubble level of the azimuth reading instrument can be adjusted using the adjustment screw. Its zero position should indicate the horizontal position of the compass top glass or compass ring, with an error of no more than 1°.
4.5.5 Field of view and altitude range
4.5.5.1 The horizontal field of view of the azimuth reading instrument should be greater than 5° on each side of its line of sight. 4.5.5.2 Altitude range of the azimuth reading instrument: Class 1: between 5° below the horizon and 30° above the horizon, [Class 2 and Class 3: between 5° below the horizon and 60° above the horizon], 4.5.6 Accuracy of sight
4.5.6.1 Parallelism of sight
The vertical azimuth line of the sight of the target sight of Class 1 and the slit of the observation sight should be parallel. 4.5.6. 2 Verticality of the diopter
The aiming plane determined by the diopter and observation diopter on the diopter shall be perpendicular to the glass or the directional ring respectively and shall pass through the axis of rotation of the azimuth readout instrument and the water bearing line on the dial azimuth and the position mark relative to the bow direction on the directional ring scale. 4.5.6.3 Installation and adjustment of sight glass
The sight glass used to measure the azimuth of the moon mark shall be installed and adjusted so that the reflecting plane is parallel to the azimuth plane at any position and the error does not exceed the provisions of Table 1. If the mirror is double-sided, both mirror parts shall meet these requirements. The use of adjustment screws is allowed. Table 1 Azimuth error (difference in azimuth from horizontal) Observation sundial and altitude
Between 5° below the water surface and 30° above the horizontal planeMore than 30° above the horizontal plane
4.5.6.4, the maximum allowable error of the distortion of the mirror and the sunshade (\)
W.CB/T 1410893
Whether or not there is a prism, the error shall not exceed the requirements of Table 1. 4.5.6.5 Prism magnifier
The difference between the azimuth of the degree disk read by the prism magnifier and the reading of the horizontal line should not exceed 0.3°. 4.5-7|Accuracy of azimuth mirrors
4.5.7.1 Focal length of the lens
The focal length of the azimuth mirror should be 1.12 times the radius of the longitude degree disk. 4.5.7.2 Adjustment of the lens
A distance from the lens to the edge of the compass disk (scale) should be set to be equal to the focal length of the lens. 4.5.7.3 Perpendicularity of the prism axis to the sighting lineThe prism axis should be perpendicular to the straight line. When aiming at a target, the azimuth error read in any bow direction should not be greater than the value in the second column of Table 2.
Table 2 Azimuth accuracy
Height of the observed object
“5° below the horizontal plane and 0° above the horizontal plane1: Between 40° and 50° above the horizontal plane
27° above the water half surface
4.5.7.4 The prism axis should be parallel to the upper glass plane of the compass. Maximum allowable error (\)
When the prism rotates around the vertical axis, any change in the azimuth read should not be greater than the value in the third column of Table 2 below. 4.5.7.5 Color mirror error of azimuth mirror
Allowed error ()
Prism should be able to transmit light from 3m away to the scale of the dial + then place the light shield in a straight line L:, otherwise the aiming line should be adjusted.
Under the prism, it is allowed to use the correction screw. 4.5.7.6 Level of azimuth reading instrument
Azimuth reading instrument should be level, with an error of no more than 1° (see 4.5.4). 4.5.8 Projector
When a shadow can only be produced at a long distance, rotate the compass and rod, and check its verticality and centering. 4.5.9 Dumb compass
4.5.9.1 The accuracy of the compass should comply with the provisions of 4.5.6. 4.5.9.2 The motion of the dumb compass in its mounting shall be within 40°. 4.5.9.3 The reading error of the azimuth of the dumb compass shall not be greater than -0-5°. 5 Test method
Compasses with or without a transmission indicating system shall be tested. Except for compasses without a mounting and used only for operation, the split basin shall be tested together with the inner and outer rings of its mounting.
Unless otherwise specified, all tests shall be carried out at a temperature of 20±3°C. 5.1 Daily test and inspection 4.3.1; 4.3.1: 4.3.6; 4.3.8; 1-3.15; 4.3.26~4.3.28; 4.3.36 4.4.1.9; 2.4.1.14; 4. 4.1.19; 4.4.1.20; 4.4.1.21; 4.5.6.1 + 4.5.6.4; 4.5.6.5; 4.5.7.2, 4.5.7.5, 4.5.8, etc. 5.2 Environmental test methods
5.2.1 High temperature test inspection
Heat the basin slowly from room temperature to 106 ± 2 °C and keep it at this temperature for at least 8 hours. In other words, the basin should not show any mechanical damage and deformation, W.bzsoso: comCB/T 14108--93
leakage and air pool, the liquid coating inside the compass should not be deteriorated, the liquid in the compass basin should be clear, the pointing system should not be deformed, and the direction system must always be connected to the axis tip. The half-period and rate error of the compass should comply with the provisions of Articles 4.3.22 and 4.3.31. 5.2.2 Inspection of low temperature test
The basin shall be slowly cooled to -3 ± 2°C and kept at this temperature for at least 8 hours. The basin shall not show any mechanical resistance, deformation, or bubbles. The liquid in the basin shall be clear, not frozen, not faded, and not separated from anticoagulants. The pointing system shall not be deformed and shall always be in contact with the shaft tip. The half-life and friction error of the compass shall comply with the provisions of Articles 4.3.22 and 4.3.31. 5.2.3 Inspection of sensible heat test
The sensible heat test shall be carried out in accordance with the provisions of GB12267. The compass shall be placed in a test box at a temperature of 40L:3℃ and a relative humidity of 93±2% for 10 hours. After the test, the compass shall meet the following requirements:
a. The compass can work normally after power is turned on;
b. The insulation resistance between each independent conductive part and between the conductive part and the metal shell shall be not less than 0.5Mn;
The main parts of the compass have no obvious brain corrosion
, and the compass surface oiliness shall meet the standards of CB 7651. 5.2.4 Inspection of moving test
The vibration test shall be carried out in accordance with the provisions of GB12267. During the test, the compass shall be tightly placed on the vibration table and scanned back and forth at a rate of one range per minute according to the specifications of Table β. Each frequency band shall be scanned for at least 15 minutes.
Rate, Hz
12. 5 ~25
25~~50
Compass is tested for vibration only in the vertical direction. Amplitude, mm
±1.6(=10 years)
±0 38(+10%)
±10±10）
Compass is found to have resonance at a certain frequency during vibration mapping, which should be eliminated. If it cannot be eliminated, a 2h endurance vibration test should be conducted at this frequency. If no resonance is found, vibrate at 15Hz for 2h. During the test, the scale on the compass disk should be readable. After the test, the compass should have no mechanical damage or loose parts. 5.2.5 Inspection of salt spray test
Salt spray test shall be conducted in accordance with the provisions of GB 2423.17. The severity level should be 4 cycles after 7 days of storage under hot and humid conditions for each spraying hour.
After the test, check that the parts, coatings and materials are not excessively damaged or corroded. 5.2.6 Inspection of the test
The mold test is carried out in accordance with the provisions of GB2423.16. The temperature of the test chamber is 29±1℃ and the relative humidity is greater than 95%, and the test time is 28 days.
After the test, check that the parts, coatings and materials are not moldy. 5.3. Basin and gimbal
5.3.1 Inspection of coercivity
Inspect according to the coercivity test.
5.3.2 Inspection of non-magnetic properties of materials
In conjunction with the inspection of the non-magnetic properties of the basin and gimbal in 5.3.24. 5.3.3 The distance between the bow baseline and the outer edge of the compass disc can be checked by using a mirror gauge mounted on the top of the edge of the compass basin, or by using a movable microscope. Or it can be measured directly when the compass basin is disassembled. For hemispherical compasses, it is limited to type tests. 5.3.4 Inspection of the visibility of the bow baseline
GB/T 14108-93
The inspection is carried out on a rotating platform with adjustable inclination. 5.3.5 Inspection of the relationship between the edge of the compass disc and the tip of the axis Open the compass and measure from a fixed horizontal reference plane with a depth gauge. 5.3.6 Inspection of the relationship between the two axes of the gimbal The angle between the axes can be measured by rotating the compass bracket so that the two axes of the gimbal successively pass through the vertical observation plane at the center of the index. The intersection line can be measured on the test bench by measuring the displacement of the gimbal bracket in the direction perpendicular to any gimbal track. 5.3.7 The thickness of the top and bottom glass shall be measured with a micrometer. 5.3.8 Check of horizontal position shall be measured by placing a bubble level with appropriate sensitivity on the top glass or the orientation ring. 5.3.9 Check of friction of the internal gimbal axis shall be checked by using an inclinometer or a bubble level. 5.3.10 Check of freedom of compass movement shall be measured by placing an inclinometer on the top glass or the orientation ring. 5.3.11 Check of freedom of the pointing system of the hemispherical compass shall be checked on a rotating platform with adjustable inclination. 5.3.12 Check of the degree of freedom of the inclination of the pointing system shall be measured on a rotating platform with adjustable inclination. 5.3.13 Check of the magnetic moment of the magnet of the pointing system shall be measured by using a magnetometer (deflection method) or other equivalent methods. 5.3.14 Check of the length of the magnet of the pointing system shall be measured by using a mobile microscope or a ruler. 5.3.15 Centering of shafts
Test on the test bench with the compass in a horizontal state, and measure the displacement required for the center of its inner edge and the axis needle to successively enter the center of the test bench. 5.3.16 Checking the height of the pivot bearing
Open the compass bowl, use the edge of the compass bowl as the reference plane, and use a depth gauge to check. 5.3.17 Checking the half-cycle of the compass
After the stabilized compass plate deviates from the magnetic meridian by 40\, and maintains at least 10g in this state, then release and measure the time interval between the first two passages through the original heading, which is the non-periodic one. Deflect the degree of deflection in reverse, repeat the measurement, and take the average value. The half-cycle can be measured with a stopwatch or other equivalent instrument. 5.3.18 Compass Attachment or Non-periodic Inspection Deflect the compass disk by 90%, hold it there for at least 10 seconds, then release it. The time required to finally return to within 1° of the magnetic line should comply with the provisions of 4.3.23. Deflect the disk in the opposite direction, repeat the measurement, and take the average value. This can be measured with a stopwatch or other equivalent instrument. 5.3.19 Inspection of Support Force When the compass basin is opened, it can be checked with a balance. 5.3.20 Inspection of the Effect of Multiplied Direct Magnetic Flux Density on the Level of the Pointing System For ordinary liquid compasses, this test should be carried out when the compass basin is disassembled. If the compass basin is sealed, it can be checked with an optical instrument. The test of the half-10
W. compass can be checked when the compass is disassembled. 5.3.21 Check of pointing error
GB/T 14108-93
The test can be carried out on the compass test bench. After adjusting the rotation center of the compass disk to the rotation line of the test bench, use a telescope or any other equivalent method, with its vertical aiming plane passing through the rotation center of the test bench and the pre-light aligned with the yaw line, and read the pointing error on the dial scale. The measurement should be carried out at least at four equidistant points, and the top glass should be tapped when measuring to eliminate friction errors (see 5.3.23).
5.3.22 Check of bow line error
The test can be carried out on the compass test bench. Adjust the longitudinal axis of the gimbal to the vertical observation plane passing through the rotation center of the test bench, and read the reading of the main scale vernier caliper. After that, move the gimbal to the rotation center of the test bench, and rotate the compass bracket until the baseline position is vertical to the observation plane. The angle of rotation is the bow baseline error. 5.3.23 Inspection of friction error
Give the pointing system an initial deflection of 2° and keep it at this position for 10s. Then release the pointing system. The pointing system should be able to return to within (3/H)\ of the initial position. Make the pointing system reversely deflect and repeat the test in reverse. The average of the two values is taken as the friction error. 5.3.24 Inspection of eddy error bzxz.net
The compass rotates at a speed of 6°/s in the horizontal plane. The compass bowl rotates 180°. The deflection of the degree disk relative to the magnetic meridian should not exceed (108/H)°
Another method is that after the compass rotates 360° at a speed of 1.5\/s, the deflection of the degree disk measured in any force direction should not exceed the following values: 8. Compasses with a dial diameter of 200 mm or more (54/1) b. Compasses with a dial diameter of less than 200 mm (36/H) should be observed after the compass has rotated 180° or 360°. After the compass fluid has stabilized, the compass should be rotated in the opposite direction and the average of the values obtained by repeated measurements is the dynamic error of the compass. 5.3.25 Check of induction error
This test shall be carried out by Meldor's "four correctors" method or other equivalent methods. In the test, the compass is mounted on the compass test bench and two soft iron correctors are symmetrically rotated at the center and arranged at the two ends of the diameter passing through the center of the compass. Then, the two soft iron correctors are rotated around the fixed compass and the coefficient D is calculated. In order to eliminate the quadrant white error, two identical correctors are arranged at equal distances from the center. The connection line of the two newly added correctors is at right angles to the connection line of the original pair of correctors. Then, the four soft iron correctors are rotated around the compass and the system error 11 is calculated. From these digits, we can find the ratio of system H to system 5.3.26 Checking the centering of the azimuth reading instrument According to the structure of the azimuth reading instrument, the rotation axis can be determined according to the indentation or center bulge on the top glass of the compass, or the inner and outer edges of the directional ring, or according to the center of the outer edge of the compass basin. On the compass test bench, make the compass in a horizontal position, and measure the displacement required for the axis tip and the rotation axis of the azimuth reading instrument to coincide with the rotation axis of the test bench. 5.3.27 Checking the eccentricity error of the azimuth ring scale Disassemble the compass and install it on the compass test bench, adjust the axis tip to coincide with the rotation center of the compass test bench, and use a telescope to observe the eccentricity relative to the azimuth ring scale.
5.4 Inspection of binnacle and correction device
5.4.1 Inspection of A1 binnacle and correction device 5.4.1.1 Inspection of support device
When the binnacle is tilted by holding the binnacle horizontally or the compass bowl is tilted by 1 inch by holding the binnacle horizontally, the angle of the maximum tilt shall be measured by an inclinometer and shall comply with the provisions of Article 4.4.1.2.
5.4.1.2 Inspection of friction of gimbal shaft and compass bowl shaft In the horizontal state, use instruments such as water level gauge and azimuth reading instrument to check. 5.4.1.3 Inspection of clearance between gimbal rail and bearing 11
W.
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