2-14. MODULE DESCRIPTIONS (cont)
TEST CONSOLE TEST BENCH 2A2 (cont)
This module tests the ability of video signal generator (VSG)
case assembly 2A2A7A1 to produce video output signals in
response to input function commands.
If an error is detected during any of the following checks, a
prompt is displayed at the completion of the test.
The VSG is programmed for a 525 line rate and the blanking level
to 0.3 volts.
The displayed video output is measured by the
programmable digitizer assembly, which is triggered by the VSG
and the following checks made:
The horizontal sync width for 4.0 to 6.0 microseconds.
The horizontal sync period for 60.0 to 68.0
The porch level of display output signal for -0.075 to
The difference between the porch level and sync level
for 0.1 to 0.4 vdc.
The time from the start of the last horizontal sync of
the even field to the beginning of the odd vertical
field for 60.0 to 68.0 microseconds.