CH 8017-1999 Aerial Survey Instrument Accuracy Verification Procedure CH8017-1999 Standard Download Decompression Password: www.bzxz.net

CH 8017-. 1999
In order to strengthen the need for the accuracy inspection of the whole machine of aerial survey instruments, this standard specifies the inspection conditions, inspection tools, methods and accuracy assessment tolerance requirements for the whole machine inspection. There is also an example of the inspection record calculation table in the standard Appendix A. This provides a unified technical basis for the accuracy inspection of the whole machine of aerial survey instruments
Appendix A of this standard is the appendix of the standard.
This standard is proposed and managed by the State Administration of Surveying, Mapping and Geoinformation. This standard was jointly drafted by the Surveying and Mapping Standardization Institute of the State Administration of Surveying, Mapping and Geoinformation and the Jiangsu Provincial Surveying and Mapping Institute. The main drafters of this standard are: Bi Chengsheng, Ma Congli and Cheng Yanhui. 152
1 Scope
Surveying and Mapping Industry Standard of the People's Republic of China
Verification regulation for the genaral accuracyof aerophotogrammetric instruments
Verification regulation for the genaral accuracyof aerophotogrammetric instrumentsCH 8017 --. 1999
This standard specifies the verification of the genaral accuracy of analog stereo plotters, analytical plotters and correctors of various levels of accuracy. This standard is applicable to the verification of the genaral accuracy of newly manufactured, in-use and maintained stereo plotters and analytical plotters, and the corresponding level of accuracy of machine-assisted or analytical plotters transformed from analog plotters and stereo coordinate measuring instruments. It is also applicable to the verification of the genaral accuracy of various types of correctors.
For instruments with corresponding levels of accuracy imported from abroad, the genaral accuracy verification of this standard can also be carried out. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. CH8006---91 Analog plotter series and basic parameters CH/T 8007--91 HMT10 analog plotter CH 8012---92 HJT 05 analytical plotter CH 8005-91 0.8~~7.0 times corrector
3 Definition
3.1 Genaral accuracy of aerophotogrammetric instruments The general term for the three-dimensional (or two-dimensional) spatial positioning accuracy of a plotter (or corrector) measured by using simulated image pairs (or simulated images) within the entire measuring range of the instrument.
3.2 Analog photograph plate is made of glass material, and the surface is engraved with cross-shaped lines of the image plane coordinate points obtained by the collinear equation, which becomes a photo of the simulated central projection image.
3.3 Analog photo pair glass plate simulates two analog photo glass plates that can form a stereo pair. 4 Testing conditions
4.1 Indoor temperature: 20C±5C;
4.2 Indoor temperature change per hour: ≤3℃/h; 4.3 Time for the test fixture to balance the temperature indoors: ≥2h; 4.4 The corrector is tested in a dark room or semi-dark room. 5 Method summary
This standard specifies the test method of using a special analog photo pair glass plate to test a stereo plotter and an analytical plotter, and the test method of using a special analog photo glass plate to test a corrector. Approved by the State Administration of Surveying, Mapping and Geoinformation on March 19, 1999
Implementation on May 1, 1999
CH 8017-1999
Simulate the geometric relationship during aerial photography. According to the designed internal and external orientation elements of the film and the overlap of the heading and the coordinate values ​​of the ground points with a certain height uniform distribution, the coordinate values ​​of the ground points on the left and right image planes are solved by the collinear equation, and the coordinate values ​​are precisely engraved on the optically processed parallel plane glass plates in the shape of "" through two coordinate engraving equipment with high precision, so as to make simulated films and simulated image pair glass plates. Thus, the error influence of the distortion of the aerial camera lens, the flattening of the film, the deformation of the photographic material, etc. is eliminated. When the simulated image pairs are tested on the volume plotter and the analytical plotter, the conventional aerial photograph operation method is used to perform internal determination, relative determination and absolute orientation, and then the two-dimensional spatial coordinates of each model point are measured. The difference between the two-dimensional coordinates and the expected values ​​is used to calculate the relative mean error of the elevation HHI... The relative elevation of the average quotient of the plane When using simulated images to test on the corrector, after using 4 corner points to correct the point, test the errors of the remaining points to evaluate the overall accuracy of the corrector.
6 Special testing equipment
6.1HMD simulated image pair glass plate
Testing equipment code:
——simulation
Aerial photogrammetry
The distribution of the points on the simulated image pair glass plate is shown in Figure 1. 6.1.1HMD) Main technical parameters of simulated image pair a. Focal length: f=152.50mm;
b. Image size: 230mm×230mm;
c. Frame mark: There are upper and lower points symmetrically distributed around the main point. , left and right frame marks and 4 cross marks at the center of the 4 quadrants with a sum of ±100mm;
Inclination: left film 9+2°30, =1\30, =0; d.1
Right film R=-1°30°, Wr+2°30°, R--0; e.
Baseline component: B=1500m, B0, B,=→30m; f.Relative altitude of the average elevation surface: H=2750m; g. Photographic scale: 1:18033;
Drawing scale: 1:5000;
i.The plane position of the ground point is shown in Figure 2. 15 points are evenly distributed within the range of 3000m×1500m as the detection and evaluation of plane accuracy;
j. Elevation point distribution: The frame structure model is used to set the elevation points. It is divided into five layers of elevation. The values ​​are +300.00m, =100.00m, 0-100.00m, and 30000m respectively. Three elevations are set at the single-number points, +300.00m, 0, and 300.00m. Two elevations are set at the double-number points, +100.00m and 100.00m. In addition, 8 points, No. 1623, are set, and the elevations are not machine centimeters and the decimals differ by 0.1m. The maximum height difference within the model range is 1/3H, and there are also elevations of the left and right main points, as shown in Figure 1. 6.1.2 Main technical requirements
a. Use 5-6mm thick glass plates after optical precision processing; b. The error of the engraved point position within the range of 230mm×230mm should be less than ±0.002~0.003mmc
The engraved line width is 0.01~0.02mm.
6.2HMP simulated image glass plate
CH 80171999
CH8017.-1999
Figure 2HMD simulated image to ground point plane position distribution diagram Note: The first digit of the three-digit number of points 1 to 15 indicates the height in meters, and the last two digits indicate the plane point number. The plane point numbers of 16 to 23 are listed with the elevation values, and there are also left and right main points 501 and 50R, a total of 18 elevations and 23 plane points. When detecting the elevation, any group of points 7, 9 and 501, 50R can be discarded, which will become 46 or 42 elevation values.
Table 1 Point number, coordinates and elevation point of HMD simulated image for ground points
1 750.000bzxZ.net
2 500.000
4 000.000
4 000.000
4 000.000
4 000.000
4 000. 000
Gauge code:
2 500.000
CH 8017—1999
Continued Table 1
2500,000
1 750.000
2 500.000
2 125.000
Aerial photogrammetry
3 625.000
3 625.000
2 875. 000
2 125. 000)
2 427.920
2 621,419
The distribution of points on the simulated photo glass plate is shown in Figure 3. The HMP simulated photo glass plate is divided into two types: HMP-1 and HMP-2 (which can be engraved on the same glass plate). Both types must be tested when testing the corrector. HMP-1 is used at 4x and 6x correction magnifications, and HMP-2 is used at 4x correction magnification.
6.2.1Main technical parameters of HMP-1 simulated photo a.
Focal length: f210.00mm
Image size: 230mmx230mm:
Inclination: 3°=+3°, 0;
Altitude: H=1260.00m;
CH 8017-1999
The plane position of ground points is shown in Figure 4, with 25 points evenly distributed within the range of 900m×900m. 6.2.2Main technical parameters of HMP-2 simulated imageFocal length: f=88.00mm;
HMP---/2
Figure 3 HMP simulated image glass plate point engraving layout diagram b.
points.
Image frame: 230mm×230mm;
Inclination: 9=+3, —3°=0;
Altitude: H=3520.00m;
The plane position of ground points is shown in Figure 5. 9 points are evenly distributed within the range of 6000m×6000m and 4 points are set in the center of 4 quadrants, totaling 1312
Figure 4 Distribution diagram of plane position of ground
points in HMP-1 simulated image
6.2.3 Main technical requirements
The thickness of the glass plate is 5~6mm and it has been optically refined.T.; the mean error of the scribed points should be less than ±0.007mm; h.
Figure 5 Distribution diagram of plane position of ground
points in HMP-2 simulated image
The width of the scribed line is 0.02~~0.04mm.
7 Testing methods
7.1 Accuracy test of stereo plotter
7.1.1 Testing equipment
CH 8017--1999
HMI) 1 pair of simulated image pair glass plates, third-class standard metal wire scale. 7.1.2 Testing methods
a. Film loading: The simulated image pair glass plates are placed on the left and right image plates respectively, and the frame mark is carefully observed through a magnifying glass to align the corresponding mark on the image plate. The alignment error shall not be greater than 0.005mm, and in some cases, it shall not be greater than 0.008mm. h. Main distance: The left and right main distances are placed = 152.50mm, accurate to 0.01mm. Model scale selection: Under the condition of ensuring the range of activity of all elevations and planes of the simulated image pair model, a larger model scale should be selected as much as possible. Generally, a model scale of 1:10000 is selected. d. Relative orientation: The residual vertical parallax of the 6 standard points (O1., OR, 501, 503, 513, 515) should not be greater than 0.010~0.015mm (equivalent to 1/4 of the measuring mark) in terms of film scale. e. Absolute orientation:
(a) Model scale normalization: Use simulated images to normalize the scale of the 4 corner points (501, 503, 513, 515) of the model. When using graphic point alignment, the plane point alignment error should be no greater than 0.1mm, and individual points are allowed to have an error of 0.2mm. When using a model point counter to record the model coordinates of the above 4 corner points for scale normalization, the difference between the side length and the diagonal line segment length and the expected value should be less than 0.02mm, and the individual line segment length is allowed to have an error of 0.03mm.
(b) Model leveling: Use the 4 corner points mentioned in (a) as plane and elevation orientation points. After reasonable allocation, the residual error of the elevation orientation point is no more than 0.15m, and the maximum difference between the 4 elevation orientation points should be no more than 0.2m, and some points are allowed to reach 0.3mf. Elevation and plane coordinate measurement:
Measure 489 (or 46, 42) elevation values ​​and 15 point plane coordinate values. (a) Elevation measurement: Use stereoscopic observation, one person for single measurement, and take the median of the readings of two round trips. The difference of the two round trip elevation readings of the same point should be no more than 0.2m, and some points are allowed to reach 0.3m. After measuring the elevation of 48 (or 46, 42) points, if the number of points with the second reading exceeding the limit (greater than 0.2m) exceeds 1/5 of the total number of points, all elevation points must be re-read. If the number of points exceeding the limit is within 1/5 of the total number of points, the elevation values ​​of the points exceeding the limit can be re-measured. See Table A1 in Appendix A for records and calculation tables. (b) Plane coordinate measurement: Stereoscopically observe and read the elevation and plane position of 15 points [801, 602, 503, 404, 205, 606, 507 (50L), 408, 509 (50R), 610, 811, 412, 513, 414, 215], and record the J coordinates of each point. The difference between the second readings of the same point should not be greater than 0.1.m of the actual field, and the individual allowable difference is 0.2m. See Table A2 in Appendix A for records and calculation tables. For stereo mapping instruments with pantographs or drawing tables but without counters, use stereoscopic observation to cut and read 9 points [801, 503, 205, 507 (501.), 408.509 (50R) 811.513, 2151 and prick the points on a 0.1mm thick polyester film (or drawing board.t), then use a third-class standard metal wire ruler to measure the side length and diagonal. The record table is shown in Table A3 in Appendix A. 7.2 Analytical plotter whole machine accuracy test
7.2.1 Test equipment
HMD simulates image pair glass plate 1 pair.
7.2.2 Test method
a. Internal orientation: After the simulated image pair glass plates are placed on the left and right film trays respectively, the measuring mark is accurately aligned with a frame mark in turn. The frame mark should have a value of zy=+100.000mm in the four quadrants. The internal orientation error should be less than 0.003mml. Some points should not be greater than 0.005mm. b. Relative orientation: The residual up and down parallax of the 6 standard points should not be greater than 0.003mm in terms of the film scale, and some points should not be greater than 0.005 mmc
Absolute orientation: The elevation values ​​and plane geodetic coordinates of the four corners and four points (501, 503, 513, 515) are used as absolute orientation values. The plane coordinate error should be less than 0.05m, and some points are allowed to reach 0.10m. The elevation orientation point error should not be greater than 0.05m, and some points are allowed to reach 0.1m. 159
CH 8017--- 1999
d. Elevation and surface coordinate measurement: Stereoscopic observation and a single measurement are used to measure the median of two readings in a round trip. Measure 48 (or 46, 42) elevation points and 15 plane coordinate values, and automatically record and print out 48 (or 46, 42) elevation values ​​and 15 plane coordinate values. You can also record and print all 48 (or 46, 42) plane coordinate values. The difference between the two readings of the elevation value of the same point in the round trip measurement should not be greater than 0.2m, and a certain point is allowed to be 0.3m larger. After measuring the elevation of 48 (or 46, 42) points in a round trip, if the number of points with the second reading exceeding the limit (greater than 0.2m) exceeds 1/5 of the total number of points, all elevation points must be re-read. If the number of points exceeding the limit is within 1/5 of the total number of points, it is allowed to re-measure the elevation value of the points exceeding the limit. See Table A1 in Appendix A for the calculation table of elevation detection records. The difference between the two readings of the same point in the plane coordinates y and y measured back and forth should not be greater than the actual 0.1m, and the difference between the two readings of the same point in the plane coordinates y and y should not be greater than the actual 0.1m, and the difference between the two readings of the same point in the plane coordinates y and y should not be greater than 0.2m. The calculation table of the plane detection record is shown in Table A4 in Appendix A. 7.3 Accuracy detection of the whole machine of the correction instrument
7.3.1 Testing equipment
HMP-1, HMP-2 simulated film glass plate, reading microscope. 7.3.2 Testing method
7.3.2.1 HMP-1 simulated film correction point a. Film loading: Place the simulated film glass plate with the surface facing down on the film frame and accurately center it. Set the instrument main distance value f-210.00mm. b. Correction point: When magnified 4 times, use a point base map with 25 points evenly distributed within the range of 600mm×600mm and the point error not greater than 0.1mm for correction point. Use the 4 points (11, 1551, 55) at the 4 corners of the outermost periphery as correction points. After the assignment, the alignment error of the 4 correction points should not exceed 0.1mm, and the individual points are allowed to be no more than 0.2mm. c. Visually estimate or use a reading microscope to read the error values ​​of 25 points when necessary, and record the position errors of the 25 points. The record table is shown in the upper left part of Table A5 in Appendix A.
d. When the zoom factor is changed to 6 times or directly placed at 6 times, use a base map with 9 points evenly distributed within the range of 450mm×450mm and the monthly expansion point error is not more than 0.1mm, and divide it into 4 quadrants (9 points each) for zoom alignment. The alignment error should not exceed 0.1mm, and the individual points are allowed to be no more than 0.2mm.
e. Read the error values ​​separately and record the alignment errors of the 9 points in each of the 4 quadrants. The record table is shown in the lower part of Table A5 in Appendix A. 7.3.2.2 HMP-2 analog film correction alignment a. Place the instrument main distance: F=88.00mm. b. Correction of alignment: When the image is enlarged 4 times, a base map with 13 alignment points distributed within the range of 600mm×600mm and with an error of no more than 0.1mm is used. The four points (111, 115, 151, 155) at the four outermost corners are used as the alignment points. After the alignment, the alignment error of the four correction points should be no more than 0.1mm, and the error of individual points is allowed to be no more than 0.2mmc. Read and record the point-to-point errors of 13 points. The record table is shown in the upper right part of Table A5 in Appendix A. 8. Test data processing and tolerance requirements for overall accuracy assessment 8.1 Test data processing
8.1.1 Elevation error
Where: V. . The difference between the average value of the secondary elevation reading and the expected value, m; n--the number of observed elevation points.
8.1.2 Relative elevation error
mn/H =1/(H/mz)
Where: H--the relative altitude of the average elevation surface, m. 8.1.3 Plane accuracy
a. 15-point plane accuracy detection for stereo plotters. 160
（2）
Error in the plane (on the model):
Transformed to the image plane:
Where: f--focal length, 152.50mm;
Average projection height on the instrument.mm;
n.—-·Number of observations;
CH 8017 -. 1999
t-—Number of unknowns (this procedure is set to 4): [v]=[deda]+[dydy] -[dx]+[ay]_N+15
N,=[dx,]+[dy,];
N-[dx]+[dy.];
dr,-adx;
dr2=h .dr;
dy,=cdy,
α, b, d are plotted in the calculation table (Table A2): d\low measured value—actual value
dy=y measured value“—yactual value;
b. 15-point plane error (on the ground) used to analyze the accuracy detection of the plotter:
converted to the image plane:
where: EVV]-[drdα]+Ldydy];
dz—the average value of the x-coordinate reading minus the expected value, m; dy-the average value of the y-coordinate reading minus the expected value of y.m; n—the number of points on the observation plane.|| tt||9 Point puncture point plane accuracy detection
(3)
For stereo plotters without counting and display functions, use the graphic puncture points and compare the measured values ​​of the side length and diagonal line segments with the required values.
8.1.4 Residual point error of the detection point after point correction After correcting the point with a simulated film, directly read the error between the projection point and the corresponding point on the point base map and mark the error direction. 8.2 Overall accuracy assessment tolerance requirements
8.2.1 Overall accuracy tolerance requirements for stereo plotters The overall accuracy tolerance requirements for stereo plotters are shown in Table 2. 161
CH 8017 --. 1999
Table 2 Precision tolerance of stereo plotter
Relative mean error of elevation
Above 1/20000
Above 1/10000
Above 1/5000
m (on image plane)
≤±0.007mm
≤±0.015mm
±0.030mm
Instrument model example
HMT05*A
HMT 10 * Ar+Bas
HMT 20*
Note: The plane accuracy listed in Table 2 does not include the drawing table and pantograph. For the plane accuracy with pantograph, the allowable error of the line segment side length is 0.2mm, and the difference of the diagonal is 0.4mm. For the rectangular coordinate drawing table, the error of the side length and diagonal is required to be no more than 0.2mm. 8.2.2 Requirements for the accuracy tolerance of the analytical plotter The requirements for the accuracy tolerance of the analytical plotter are shown in Table 3. Table 3 Accuracy tolerance of the analytical plotter
Relative mean error of elevation
Above 1/20000
Above 1/10000
Above 1/13000
Above 1/5000
Note: *Refer to (H 800--91;
* *Refer to CH 8012-92;
** *Refer to the surveying and mapping standard system table (96). 8.2.3 Requirements for the accuracy limit of the corrector as a whole
mr (on the image plane)
±0.007mm
≤±0.015mm
≤±0.010mm
≤±0.030mm
Example of instrument model
HJT02BC-1,C130
HJT05 JX-3,APS-P*-
HMT10\
HJTI0**
When correcting at 4x or 6x magnification, when the error of the correction point at the four corners is less than 0.1mm (0.2mm for some), the residual alignment error of the detection point should be within 0.1mm (the error of some individual points is allowed to be up to 0.2mm). 8.3 Processing of test results and calibration cycle
8.3.1 Instruments that meet the accuracy tolerance requirements of this standard after testing should be issued with an instrument accuracy calibration certificate. Those that do not meet the requirements of this standard should be issued with a calibration result notice. Users must recalibrate and repair, and then recalibrate. If instruments of various grades have been used for a long time and still cannot meet the original grade tolerance requirements of the instrument after calibration and repair, the instrument grade can be lowered and a certificate of compliance can be issued according to the tolerance level it meets. 8.3.2 The calibration cycle can be determined according to the specific use of the instrument, generally 1 year, and for analytical plotters, the longest period is no more than 2 years. In particular, the instrument must be calibrated in a timely manner after moving or major calibration. 162
Instrument name:
Model, serial number:
Expected value/m
Expected value/
Expected value／m
Number of observed elevations n
Meanwhile error in elevation m=
Meanwhile error in relative elevation mz/H=1/
CH 8017--1999
Appendix A
Test record calculation form
(Supplement)
HMD simulated image pair model elevation test form
Test location:
Case temperature:
Observer:
Recorder:
Calculator;
Date:1999
Table 2 Accuracy limits of stereo plotter
Relative mean error of elevation
Above 1/20000
Above 1/10000
Above 1/5000
m (on image plane)
≤±0.007mm
≤±0.015mm
±0.030mm
Instrument model example
HMT05*A
HMT 10 * Ar+Bas
HMT 20*
Note: The plane accuracy listed in Table 2 does not include drawing tables and pantographs. For the plane accuracy with pantograph, the side length of the line segment is allowed to differ by 0.2mm, and the diagonal difference is 0.4mm. For the rectangular coordinate drawing table, the side length and diagonal error are required to be no more than 0.2mm. 8.2.2 Requirements for the accuracy tolerance of the analytical plotter The requirements for the accuracy tolerance of the analytical plotter are shown in Table 3. Table 3 Accuracy tolerance of the analytical plotter
Relative mean error of elevation
Above 1/20000
Above 1/10000
Above 1/13000
Above 1/5000
Note: *Refer to (H 800--91;
* *Refer to CH 8012—92;
** * Refer to the table of surveying and mapping standard system (96). 8.2.3 Requirements for accuracy tolerance of the whole correction instrument
mr (on the image plane)
±0.007mm
≤±0.015mm
≤±0.010mm
≤±0.030mm
Instrument model example
HJT02BC-1,C130
HJT05 JX-3, APS-P*-
HMT10\
HJTI0**
When the correction is made at 4 times or 6 times, when the error of the correction point of the four corners is less than 0.1mm (0.2mm for some), the residual error of the detection point should be within 0.1mm (the error of some is allowed to be up to 0.2mm). 8.3 Processing of test results and verification cycle
8.3.1 The instrument that meets the accuracy limit requirements of this standard shall be issued with an instrument accuracy verification certificate, and the instrument that does not meet the accuracy limit requirements of this standard shall be issued with a verification certificate. The user must recalibrate and repair the instrument and then recalibrate it. If the instrument of each grade has been used for a long time and still cannot meet the original grade tolerance requirements after calibration and repair, the instrument grade can be lowered and a certificate of conformity will be issued according to the tolerance level it has achieved. 8.3.2 The calibration cycle can be determined according to the specific use of the instrument, generally 1 year, and for analytical plotters, no longer than 2 years. In particular, the instrument must be calibrated in time after moving or major calibration. 162
Instrument name:
Model, number:
Should have value/ m
Should have value/
Should have value／ m
Number of observed elevations n
Meanwhile error in elevation m=
Meanwhile error in relative elevation mz/H=1/
CH 8017--1999
Appendix A
Test record calculation form
(Supplement)
HMD simulation image pair model elevation test form
Test location:
Case temperature:
Observer:
Recorder:
Calculator;
Date:1999
Table 2 Accuracy limits of stereo plotter
Relative mean error of elevation
Above 1/20000
Above 1/10000
Above 1/5000
m (on image plane)
≤±0.007mm
≤±0.015mm
±0.030mm
Instrument model example
HMT05*A
HMT 10 * Ar+Bas
HMT 20*
Note: The plane accuracy listed in Table 2 does not include drawing tables and pantographs. For the plane accuracy with pantograph, the side length of the line segment is allowed to differ by 0.2mm, and the diagonal difference is 0.4mm. For the rectangular coordinate drawing table, the side length and diagonal error are required to be no more than 0.2mm. 8.2.2 Requirements for the accuracy tolerance of the analytical plotter The requirements for the accuracy tolerance of the analytical plotter are shown in Table 3. Table 3 Accuracy tolerance of the analytical plotter
Relative mean error of elevation
Above 1/20000
Above 1/10000
Above 1/13000
Above 1/5000
Note: *Refer to (H 800--91;
* *Refer to CH 8012—92;
** * Refer to the table of surveying and mapping standard system (96). 8.2.3 Requirements for accuracy tolerance of the whole correction instrument
mr (on the image plane)
±0.007mm
≤±0.015mm
≤±0.010mm
≤±0.030mm
Instrument model example
HJT02BC-1,C130
HJT05 JX-3, APS-P*-
HMT10\
HJTI0**
When the correction is made at 4 times or 6 times, when the error of the correction point of the four corners is less than 0.1mm (0.2mm for some), the residual error of the detection point should be within 0.1mm (the error of some is allowed to be up to 0.2mm). 8.3 Processing of test results and verification cycle
8.3.1 The instrument that meets the accuracy limit requirements of this standard shall be issued with an instrument accuracy verification certificate, and the instrument that does not meet the accuracy limit requirements of this standard shall be issued with a verification certificate. The user must recalibrate and repair the instrument and then recalibrate it. If the instrument of each grade has been used for a long time and still cannot meet the original grade tolerance requirements after calibration and repair, the instrument grade can be lowered and a certificate of conformity will be issued according to the tolerance level it has achieved. 8.3.2 The calibration cycle can be determined according to the specific use of the instrument, generally 1 year, and for analytical plotters, no longer than 2 years. In particular, the instrument must be calibrated in time after moving or major calibration. 162
Instrument name:
Model, number:
Should have value/ m
Should have value/
Should have value／ m
Number of observed elevations n
Meanwhile error in elevation m=
Meanwhile error in relative elevation mz/H=1/
CH 8017--1999
Appendix A
Test record calculation form
(Supplement)
HMD simulation image pair model elevation test form
Test location:
Case temperature:
Observer:
Recorder:
Calculator;
Date:
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