TB 9-6625-1935-24
CALIBRATION PROCESS
WITHOUT POWER METER CALIBRATOR
13. Preliminary Instructions
a. The instructions outlined in paragraphs 12 and 13 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 the calibration.
Adjustments required to calibrate the TI are included in this procedure. Additional
maintenance information is contained in the manufacturer's manuals for this TI.
d. Unless otherwise specified, all controls and control settings refer to the TI.
14. 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.
NOTE
The following procedures are oriented to model 432A (ME-
441/U) power meter. The technique for calibrating model 432B
is the same with the following exceptions. Model 432B has
only four range switch settings, 10 μW, 100 μW, 1 mW and 10
mW.
Omit checks for 0.03 and 0.3 mW ranges when
calibrating model 432B.
a. If necessary, mechanically zero model 432A (ME-441/U) meter as follows:
(1) Rotate mechanical adjustment screw clockwise until pointer is to left of 0 and
moving up scale toward 0. Stop when pointer is over 0 mark. If pointer overshoots, repeat
the process.
(2) With pointer over 0, turn adjustment screw approximately three degrees
counterclockwise to free meter movement. If pointer moves off 0, repeat adjustment.
b. Connect TI to a 115 V ac source.