TB 9-6625-2043-24
repeat paragraphs 8 through 14.
Do not perform power supply check if all other
parameters are within tolerance.
e. Unless otherwise specified, all controls and control settings refer to the TI.
7. Equipment Setup
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.
NOTE
Calibrate model 42BD with matching serial numbered power
detector.
a. Do not remove protective cover from TI until required for adjustments.
b. Connect power detector (supplied with TI) to POWER DETECTOR terminal and be
sure that connectors are tight on TI cable connecting power detectors.
c. Set 230-115 line voltage selector switch on rear panel to 115 position and verify that
line voltage fuse holder is equipped with a 0.2-A (0.1 on some models), 115 V slow blow fuse.
d. Adjust mechanical zero adjustment screw, located in bezel below meter face, for zero
indication (not on all models).
e. Position controls as listed in (1) through (4) below:
(1)
Power switch to off (OFF).
FULL SCALE switch to +10 dBm.
(2)
CAL FACTOR control to 0.
(3)
ZERO control fully ccw.
(4)
f. Connect TI to a 115 V ac source.
g. Set TI power switch to on (PWR) and allow 5 minutes for TI to warm-up and stabilize.
h. Zero TI by performing (1) through (5) below:
(1) Remove RF power from TI power detector. Avoid unnecessary handling of TI
power detector to minimize thermal disturbances.
(2) Set FULL SCALE switch to -50 dBm.
(3) Adjust ZERO control until average indication of TI meter is at downscale zero
mark (minus sign flashes on and off).
(4) Set FULL SCALE switch to appropriate range for power to be measured.
(5) Reapply RF power to TI power detector.
8. Calibration Factor Control
a. Performance Check