TB 9-6625-1932-35
(14) Calculate and record the power level from the below listed formula as P1:
P1 =
2 VCOMP (V1 - V0) + V02 - V12
4 R (calibration factor)
P1 = Output power level
VCOMP = Value recorded in (13) above.
V1 =Value recorded in (12) above
V0 = Value recorded in (8) above
R = Value recorded in 11f above
Calibration Factor = Value for standard thermistor mount at test frequency
(15) Set power meter No. 1 RANGE switch to COARSE ZERO and adjust front
panel COARSE ZERO control for a zero meter indication.
(16) Set power meter No. 1 RANGE switch to 1 mW and zero power meter No. 1.
(17) Disconnect power meter No. 2 from programmable sweep generator and connect
equipment as shown in figure 8, CONNECTION B.
NOTE
Do not disturb programmable sweep generator LEVEL output
controls while performing (18) below.
(18) Record power meter No. 1 indication as P2.
(19) Compare power meter No. 2 (P1) value recorded in (14) above with power meter
No. 1 (P2) level recorded in (18) above. Differences in power levels will not exceed the
tolerance listed in appendix A.
NOTE
Perform b below for Hewlett-Packard, Models 478A and 8478B
that fail (19) above.
(20) Repeat technique of (1) through (19) above for a test frequency near the center
and one at the upper end to TI response range or at specified frequencies requested by
activity submitting TI for calibration.
b. Adjustments. Perform 8b above.
13. Final Procedure
a. Deenergize and disconnect all equipment and reinstall protective cover on TI.
b. Annotate and affix DA label/form in accordance with TB 750-25.
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