This standard specifies four test methods for the scanning linearity of marine navigation radar displays: ranging test method; length test method; test signal test method (concentric circle test method, concentric equidistant square signal test method); raster scanning displays can also use the square signal test method. This standard applies to the test of the scanning linearity of marine navigation radar plane position display (PPI, hereinafter referred to as display). SJ/T 10294-1991 Test method for scanning linearity of marine navigation radar display SJ/T10294-1991 Standard download decompression password: www.bzxz.net
This standard specifies four test methods for the scanning linearity of marine navigation radar displays: ranging test method; length test method; test signal test method (concentric circle test method, concentric equidistant square signal test method); raster scanning displays can also use the square signal test method. This standard applies to the test of the scanning linearity of marine navigation radar plane position display (PPI, hereinafter referred to as display).

GB 2421 General provisions for basic environmental testing procedures for electrical and electronic products

Electronic Industry Standard of the People's Republic of China
SI/T 10294—91
Test Method for Scanning Linearity of Marine Navigation Radar Display
Published on 1991-05-28
Implementation on 1991-12-01
Published by the Ministry of Machinery and Electronics Industry of the People's Republic of China Electronic Industry Standard of the People's Republic of China
Test Method for Scanning Linearity of Marine Navigation Radar Display 1 Subject Content and Scope of Application
SJ/T 1G294—91
1.1 This standard specifies four test methods for the scanning linearity of marine navigation radar display, namely: index test method; signal test method (centripetal circle test method, centripetal square signal test method); grating scanning indicator can also use grid signal test method.
1.2 This standard is used for scanning linearity test of marine navigation front surface cold display (PPI, hereinafter referred to as display). 2 Reference standards
[T2421] Product environmental test procedures 3 Requirements
3.1 Scanning linearity
The ratio of the maximum value of the scanning angle at each point on the radial line through the center of the image to the measured value. 3.2 Scanning nonlinearity
The ratio of the maximum value of the scanning angle at each point on the radial line through the center of the image to the measured value and the normal value of the two documents.
4 Tester and its requirements
4. Next pulse generator
a The indicated load quotient is continuously adjusted from zero;
b The output pulse width is 0.03~C8u%
4.2 The pulse generator frequency should not be less than: 05Mlz.
Company.3 Concentric test signal generator
Original current diagram see Appendix A (reference diagram A1,, can generate editable signal! Only select the device PROK: the target output signal product high frequency is 20MFz comprehensive impact width is C.3-,U%u5; h.
can be synchronized externally.
4.4 Concentric equidistant force signal generator
Original Shenzhen excavation diagram A (reference) Figure A2. Give input azimuth signal and super first signal:
People's Republic of China Tian Machinery and Electronic Industry Approved on May 28, 1991, implemented on December 1, 1991
SJ/T10294
h Box with adjustable isolation and other features 5 Test pieces
Unless otherwise specified, the test atmospheric conditions shall comply with the test atmospheric conditions of the normal zone specified in 4.3 of GB2421. 6 Test methods
6.1 Shadow test method
6-1.1 Test block diagram See Figure 1
Medical generator
Pulse filter
6-1.? Press Figure 1 connects the display and the test instrument, and adjusts the test instrument and the display to make them work properly. 6.1.3 When the fluorescent lamp is on, use an oscilloscope to measure the scanning line from the start to the end at the fixed points on the scale at equal intervals. The ratio is calculated by calculating the scanning nonlinearity K by using formula (2) at each fixed point on the scanning length. K-
scanning linearity:
scanning nonlinearity!
The maximum time between two adjacent fixed points is called the maximum time between two adjacent fixed points. A
... is the maximum time between two adjacent fixed points. 6.1.4 Repeat the above test for all ranges of the display. 6.2 Test method
6.2.1 When the display is working normally, use a soft ruler to measure the distance between two fixed-distance marks on the display screen (including the distance from the first fixed-distance mark to the super point), find Ax and A, and calculate the scanning linearity K according to formula (3) or the scanning characteristic K\K according to formula 4) where: A
SJ/T1029491
2(Am - Am)
The maximum distance between two fixed-distance marks, mm1The minimum distance between two fixed-distance marks, mm. 6.2.2 Repeat the above test for all ranges of the display. 6.3 Test signal test method
6-3-1 Concentric four-signal test method
5.3.1.1 Micro-test data diagram 2.
City Darong Development
Company center circle
Centripple
Test signal generator
6-3.1.2 Connect the indicator and the test receiver as shown in Figure 2
6.3.1.3 Adjust the output rate of the generator, and on the entire screen of the indicator, display at least ten equally spaced concentric circles, and in the first figure, display five equally spaced smaller ones. Use a soft ruler to measure the distance between the two adjacent large Shangxin countries (including the salvage starting point, carry out Au and Ardr.
Calculate the scanning linearity using formula (3), or calculate the second scanning linearity using formula (4). 6.3.1.4 Repeat the above reverse test for all monitors. 6.3.1.5 Check whether the three equally spaced small concentric figures are evenly spaced. Check the scanning linearity near the scanning center. 6.3.1.6 For digital monitors, the programmable read-only memory (FPR0M) (or debugging EPROM) in the monitor should be used to store the test signal. On the basis of the concentric circles, draw a few equally spaced orthogonal straight lines in the area about 1/6 of the diameter of the scanning center of the screen to check the scanning linearity near the scanning center. .3.2 Same as .3 square number test method
6.3.2.1 Test period see 3,
concentric equal square total times
micro square response signal
most reliable
signal generation
6.3.2.2 Connect the display and test instrument as shown in Figure 3, Figure 3
concentric equal square as the shape signal
63.2.3 Thanks to the auxiliary mountain degree of the section generator
SJ/T10294-91
shape formed by six fixed ministers connected on the measuring display screen, use the obtained ruler to measure the gate interval (position bracket) between each shape on the tracing gauge Center point), find A and A. Use formula (3) to calculate scanning linearity or use formula (1) to calculate scanning nonlinearity. 6-4 Grid signal test method
optical scanning display, the grid signal should be stored in the EPROM (or debugging FPRCM) in the display. The grid signal in the water is not less than 16. The number of vertical grids is not less than 12, and the horizontal grid width is 4m and the maximum grid width A. (The edge grid is not calculated). Use formula 3 to calculate scanning linearity, or use formula () to calculate scanning nonlinearity. Use which method to measure and calculate the vertical linearity: A1 concentric display test signal generation quotient
principle diagram see Figure A1 ,
SJ/T10294-91
A
Special test signal for scanning generates weak signal frame (test piece)
CounterWww.bzxZ.net
Hit trigger pulse
A2 concentric equal square signal generation test
Original frame diagram see Figure A?
Large period position signal
First signal
Additional instructions:
Concentric signal
Recommended device
Is the source of medical vision
Central equal square signal
This standard is also responsible for the benefit of the radio flash factory, and the drafter of this standard is Zhang Yuxia.
Display eye scanning multiplication system
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