TM 11-6625-3081-23
8-3. ANALOG TO DIGITAL CONVERTER ASSEMBLY 2A2A13 (cont)
8 - 3
SIGNAL PROCESSOR OFFSET ADJUSTMENT
28. Set front panel digiswitches to
100000.
Press ANALOG switch.
29. If necessary, adjust R14 (13) and
R16 (14) on CCA until front panel
DATA DISPLAY indicates as close to O
as possible.
(Upper limit is 4 and
lower limit is 177774.)
A/D GAIN ADJUSTMENT
30. On USM-410 DC Station A2 DC standard
(programmable constant current con-
stant voltage calibrator) A9,
connect the SENSE and OUTPUT
positive (+) terminals together and
the SENSE and OUTPUT negative (-)
terminals together. Set POWER
switch to OPR.
Press CROWBAR OFF
switch.
Set MODE switches to 10
VOLTS.
Set decade dials for output
of 7.500000 volts.
Temporarily con-
nect a digital voltmeter to A2A9
output terminals and verify output
voltage is correct.
CAUTION
When connecting cable between DC
standard A2A9 and extender card,
ensure that LO (black) output termi-
nal on DC standard is connected to
GND side of both BNC to banana plug
adapters.
Also ensure that GND side
of BNC to banana plug adapter is
connected to - jack on extender
card.
31. Using a BNC to banana plug adapter,
connect a 13081706-69 coaxial cable
to DC standard A2A9 output. Using a
second BNC to banana plug adapter,
connect opposite end of cable to
extender card + and -
jacks.
32. Set extender card switch S3 to
position 2.
Press front panel
ANALOG switch.
Change 9
8-7
