Table of Contents
Advertisement
DISPLAY MEMORY STRUCTURE
Y P O S I T I O N
i n D i s p l a y U n i t s
For each trace, A, B, or C, the display width on the CRT is determined by the instruction word in the first address
for that trace. In the example below, the first address is 1024 and the instruction word is 1040.
Trace B
Addresses
Addresses 2023 and 2024 describe one trace line drawn from x,y coordinates (998,181) to x,y coordinates
(999,162). The 1072 values shown for the overrange addresses tell the analyzer to blank these values instead of
interpreting them as coordinates.
ANNOTATION AND GRATICULE
Page 3 of the display memory fills with instructions on instrument preset. These instructions draw the graticule and
annotation on the displays.
The display memory in page 3 contains the information necessary to position and display (or blank) labels,
graticule lines, and markers. A brief description of the contents of page 3 is given on the next page. The first
2 A p p e n d i x
1 0 2 3
1 0 0 0
7 0 0
6 0 0
5 0 0
4 0 0
3 0 0
2 0 0
1 0 0
0
0
1 0 0
2 0 0 3 0 0 4 0 0 5 0 0 6 0 0 7 0 0 8 0 0 9 0 0 1 0 0 0 1 0 2 3
X POSITION in Display Units
Amplitude
Address
1024
1025
1026
I
2024
2025
2026
2027
2047
Value, Y
1040
Display Instruction
622
531
181 :
162
185
1072
1072
1072
1072
APPENDIX A
(1,531)
I
I
(998,181) :
(999,162)
(1000,185)
Over-range
Addresses
(Blanked)
Advertisement
Table of Contents
