TM 11-6625-3081-23
2-14. MODULE DESCRIPTIONS (cont)
2-14
c.
TEST CONSOLE TEST BENCH 2A2 (cont)
Input Code
PPGTST
2-78
Description
This module tests the ability of the programmable pulse generator
(PPG) 2A2A7A6A8 to produce correct output pulses in response to
input function commands,
Each of the four output channels is
programed for a test pulse which is checked using the pro-
grammable digitizer assembly 2A2A1.
PPG output 1 is programed for a 1.0 microsecond positive pulse.
The PPG gating feature is programmed to switch off every other
pulse resulting in a period of 10 microseconds. The measured
pulse is checked for a pulse width of 0.95 to 1.05 microseconds
with a period of 9.95 to 10.05 microseconds, a low state of -0.5
to +0.8 vdc, and a high state of +2.5 to +5.5 vdc.
An error in the pulse measurements will display a prompt at the
completion of the test.
PPG output 2 is programmed for a 2.0 microsecond positive pulse.
The PPG gating feature is programmed to switch off every other
pulse resulting in a period of 10 microseconds. The measured
pulse is checked for a pulse width of 1.95 to 2.05 microseconds
with a period of 9.95 to 10.05 microseconds, a low state of -0.5
to +0.8 vdc, and a high state of +2.5 to +5.5 vdc.
An error in the pulse measurements will display a prompt at the
completion of the test.
PPG output 3 is programed for a 3.0 microsecond pulse. The PPG
gating feature is programmed to switch off every other pulse
resulting in a period of 10 microseconds. The measured pulse is
checked for a pulse width of 2.95 to 3.05 microseconds with a
period of 9.95 to 10.05 microseconds, a low state of -0.5 to
+0.8 vdc, and a high state of +2.5 to +5.5 vdc.
An error in the pulse measurements will display a prompt at the
completion of the test.
PPG output 4 is programed for a 4.0 microsecond positive pulse.
The PPG gating feature is programmed to switch off every other
pulse resulting in a period of 10 microseconds. The measured
pulse is checked for a pulse width of 3.95 to 4.05 microseconds
with a period of 9.95 to 10.05 microseconds, a low state of -0.5
to +0.8 vdc, and a high state of +2.5 to +5.5 vdc.
An error in the pulse measurements will display a prompt at the
completion of the test.
