TB 9-6625-2210-24
CALIBRATION PROCESS FOR
TRANSMISSION TEST SET AN/USM-608
6. Preliminary Instructions
a. The instructions outlined in paragraphs 6 and 7 are preparatory to the calibration
process. Personnel should become familiar with the entire bulletin before beginning the
calibration.
b. Items of equipment used in this procedure are referenced within the text by common
name as listed in table 2.
c. Unless otherwise specified, verify the result of each test and, whenever the test
requirement is not met, take corrective action before continuing with the calibration.
Adjustments required to calibrate the TI are included in this procedure. Additional
maintenance information is contained in TM 11-6625-3187-10 and TM 11-6625-3187-24.
d. Unless otherwise specified, all controls and control settings refer to the TI.
7. Equipment Setup
WARNING
HIGH VOLTAGE is used or exposed during the performance of
this calibration.
DEATH ON CONTACT may result if
personnel fail to observe safety precautions.
REDUCE
OUTPUT(S) to minimum after each step within the
performance check where applicable.
a. Remove TI upper protective cover.
b. Connect TI to 115 V ac source and switch power on.
c. When main menu appears, select F2: TIMS/RL.
d. Select B: LEVEL/FREQ/ENV DELAY from TRANSMISSION MEASUREMENT
menu, and set parameters as listed in (1) through (7) below:
(1) 4 Wire/2 Wire to 4 Wire.
(2) RECEIVE IMPEDANCE to 600 OHMS.
(3) RECEIVE TERMINATED/BRIDGED to TERMINATED.
(4) RECEIVE TLP/ABS to ABSOLUTE.
(5) TRANSMIT IMPEDANCE to 600 OHMS.
(6) TRANSMIT TERMINATED/BRIDGED to TERMINATED.
(7) TRANSMIT TLP/ABS to ABSOLUTE.
e. Press Pg Dn key and set parameters as listed in (1) through (10) below:
(1) SF SKIP to ON.
(2) INCR RATE to 3.0.