TB 9-6625-1932-35
SECTION IV
(SECONDARY TRANSFER ONLY)
10. Preliminary Instructions
a. The
instructions outlined in
paragraphs 10 and
11 are preparatory to the
calibration
process. Personnel should become familiar with the entire procedure before beginning the
calibration.
b. Items of equipment used in this procedure are referenced within the text by common
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.
11. Equipment Setup
CAUTION
Do not twist the body of power sensors when connecting and
disconnecting. Twisting can cause major damage to the power
sensor circuit.
a. Evaluate TI
for frequency range and
select test frequencies near top, center, and
lower end of TI frequency range unless certification at specific frequencies is requested by
NOTE
Select test frequencies which are closest to values listed on test
report for standard thermistor mount.
b. Select standard thermistor mount according to TI being calibrated.
c. Connect TI to power meter No. 1 interconnect cable.
WARNING
Do not apply power to power meter No. 2 for steps d through g
below.
d. Set up
digital multimeter to
measure resistance.
e. Connect digital multimeter leads between power meter No. 2 VRF
center conductor
(rear panel) and pin 1 of standard thermistor mount end of power meter No. 2 interconnect
cable.
f. Round off digital multimeter indication to two
decimal places and
record value as R.
17