TB 9-6625-1932-24
CALIBRATION PROCESS
(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
name as listed in table 1.
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
activity submitting TI for calibration.
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 multimeter to measure resistance.
e. Connect 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 multimeter indication to two decimal places and record value as R.
g. Disconnect multimeter leads from power meter No. 2.
h. Press power meter No. 1 and power meter No. 2 POWER switches to on position.