TB 9-6625-1932-24
(2) Adjust programmable sweep generator LEVEL output controls for 0.1 mW or a
suitable power level within the range of the TI. Record multimeter indication as V2.
(3) Adjust programmable sweep generator LEVEL output controls for 1 mW or a
suitable power level within the range of the TI. Record multimeter indication as V2.
(4) Press programmable sweep generator RF output pushbutton to OFF position.
Record multimeter indication as V1.
(5) Press programmable sweep generator RF output pushbutton to ON position.
Ensure multimeter indicates V2 value recorded in (2) or (3) above.
(6) Disconnect standard thermistor mount from equipment setup.
Do not disturb programmable sweep generator LEVEL output.
(7) Connect equipment as shown in either figure 2 or 3, CONNECTION B.
(8) Allow enough time for TI to stabilize and record power meter No. 1 indication.
(9) Use formula below and calculate substituted dc power level for standard
thermistor mount.
V
12 V22
P=R
Kb
Where:
P=
Power in mW.
R=
Bridge connection factor (2.2222 for 200 thermistor mount and
2.500 for 100 standard thermistor mount)
V1 = Power bridge output voltage with RF output OFF
V2 = Power bridge output voltage with RF output ON
Kb = CAL FACTOR of standard thermistor mount from chart
(10) To determine TI CAL FACTOR (Kb): Divide power calculated in (9) above into
power recorded for TI in (8) above. Difference in computed Kb factor value and Kb value
marked on TI will not exceed tolerance listed in Appendix A.
NOTE
Perform b below for Hewlett-Packard, Models 478A and 8478B
that fail (10) above.
(11) Repeat technique of (1) through (10) above for remaining standard thermistor
mounts cardinal test point frequencies determined in 7 c above.
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