TB 9-6625-2185-24
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.
a. Remove top and bottom covers as needed to gain access to calibration switches and
adjustment locations respectively.
b. Connect sensor to TI with interconnect cable (p/o TI).
c. Connect TI to 115 V ac power source and allow a 30 minute warm-up.
d. Connect thermistor mount H75-478A to power meter.
Set power meter
CALIBRATION FACTOR switch to 100%. Allow 30 minute warm-up.
NOTE
Ensure multimeter input jacks are isolated from chassis
ground throughout this procedure.
NOTE
Calibration factors and serial numbers of power sensors are
stored in the nonvolatile memory of TI. Owning organization
must submit meter and sensor as a unit for proper calibration.
More than one power sensor may be stored in memory. To
select a sensor, press sensor number (1 or 2) and SELECT
SENS. To check the sensor serial number selected, press
decimal (.) and SELECT SENS.
NOTE
Actual value of 20 dB attenuator (p/o TI) should be known to
be within 0.04 dB at 50 MHz prior to calibration of TI.
e. Press decimal (.) and SELECT SENS pushbuttons.
Confirm that TI display
matches serial number of sensor (last four digits).
8. Power Reference Level
a. Performance Check
(1) Connect frequency counter to TI PWR REF. Frequency counter will indicate
between 49.5 and 50.5 MHz.
(2) Press power to OFF on power meter and remove thermistor mount from
interconnect cable. Set multimeter to measure resistance.
