TM9-4935-481-14-1
C3
Table 3-14. TTS Performance Test-Continued
Table 3-14. TTS Performance Test-Continued
STEP
UNIT
PROCEDURE
CORRECTIVE ACTION
STEP
UNIT
PROCEDURE
CORRECTIVE ACTION
IR Irradiance Test (Near-Ctr-Diodel
518
MCP
Disconnect the thermistor cable from J17.
Boresight Mode
519
MCP
Connect the 1W14 cable to J17.
520
TTS
Connect DMM pos. probe to 1A8A1-J5 and neg. probe to 1A8A2-J1.
505
CIP
COUNTER INHIBIT(SEC) dial to 06.00.
521
DMM
Observe and record the reading on the DM1.
506
CIP
RUN/HOLD/OFF switch to RUN.
522
Convert the resistance reading recorded in step 515 to a
507
MCP
Record the temperature.
NOTE
523
Using the IR source, control voltage generator output limits vs.
test points to aid the operator in detecting the OAC
minimum, and nominal values of the output for the temperature
output signal during this alignment. Use the DMM for
recorded in step 522.
final amplitude peaking. After completing the final
524
Verify the value recorded in step 521 lies between or is equal
amplitude peaking do not disturb the mechanical inter-
to the maximum and minimum values recorded in step 523
face between the OAC and the radiometer.
.
525
MCP
DMM INPUT switch to SEL A.
(37)
508
PPE
Momentarily actuate TEST START switch (power on).
526
MCP
DMM LO switch to SYS GND.
509
CIP
Observe INHIB lamp illuminated.
527
TTS
Remove DMM probes from 1A8.
510
MCP
DMM INPUT switch to DMM INPUT.
528
OAF
Adjust the OAF AZIMUTH and ELEVATION controls to obtain the
511
MCP
DMM LO switch to EXT.
highest VAC reading, as displayed on the DMM.
512
MCP
Disconnect the 1W14 cable from J17.
529
DMM
Observe a reading of 0.1380 to 0.2300 Vac.
513
Verify the thermistor probe is mounted under one of the TTS OAC
(39)
530
TTS
MONITOR SELECT switch to IR OUTPUT.
514
MCP
Connect the thermistor cable to J17.
531
TTS
Observe TTS MONITOR meter for a reading within the IR OUTPUT
515
MCP
DMM FUNCTION switch to K OHMS.
green band (5.5 to 9.5 volts).
516
DMM
Observe and record the reading on the DMM.
(41)
517
MCP
DMM FUNCTION switch to VAC.
3-235