TM 11-6625-3081-23
2-18.2.
VISUAL/NEAR INFRARED (VIS/NIR) ALIGNMENT CHECK (cont)
2-18.2
7.
Set up oscilloscope as follows:
Sweep:
1 MSEC/DIV
Channel 1:
1V/DIV
Channel 2:
5V/DIV
Coupling:
AC
Horizontal
A (locks knobs)
display:
Trigger mode:
LF REJECT
Trigger source: CH2
8. Allow 20 minutes warmup time.
VERTICAL POSITION ALIGNMENT CHECK
9.
Check oscilloscope for position of
vertical pulse.
From rising edge of
ODD FIELD pulse, pulse should be
delayed between 7.379 and 8.031
milliseconds.
10. Disconnect ODD FIELD connector of
sync cable from oscilloscope channel
2.
HORIZONTAL POSITION ALIGNMENT CHECK
11. Connect HIGH SYNC connector of sync
cable to oscilloscope channel 2.
12. Change oscilloscope sweep setting to
5 USEC/DIV.
13. Check oscilloscope for position of
horizontal pulse. From rising edge
of high sync pulse, pulse should be
delayed between 36.075 and 38.295
microseconds.
EQUIPMENT DISPOSITION
14. When testing is complete, return
equipment to stock.
If VIS/NIR
optical path fails alignment check,
notify appropriate maintenance
personnel.
END OF TASK
Change 10
2-151
