TB 9-6625-1935-24
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.
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 and 100 μW and 1 and 10
mW. Omit checks for .03 and .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.
8. Meter Accuracy Test
a. Performance Check
(1) Position power meter calibrator controls as listed in (a) through (d) below:
(a) LINE switch to OFF.
(b) FUNCTION switch to 200
.
(c) POWER switch to .01 mW.
(d) ZERO/TEST switch to ZERO.
(2) Position TI controls as listed in (a) through (c) below:
(a) MOUNT RESISTANCE switch to 200
.
(b) RANGE switch to .01 mW (10 μW for model 432B).
(c) CALIBRATION FACTOR switch to 100 %.
(3) If applicable,
set
OPERATE/CALIBRATE
SWITCH
A2S1
to
CALIBRATE.
(4) Connect equipment as shown in figure 2. Energize appropriate equipment and
allow 10 minutes for equipment to warm-up and stabilize.
