TB 9-6625-1932-24
12. Calibration Factors
a. Performance Check
(1) Press synthesized signal generator RF output pushbutton to OFF position.
(2) Adjust synthesized signal generator frequency controls for first cardinal point
determined in 11 a above.
(3) Set power meter No. 2 RANGE switch to COARSE ZERO and adjust front
panel COARSE ZERO control for a zero meter indication.
(4) Ensure multimeter input terminals are isolated from chassis ground for (5) below.
(5) Connect multimeter positive lead to power meter No. 2 VCOMP and connect
multimeter negative lead to power meter VRF.
(6) Set power meter No. 2 RANGE switch to 1 mW.
(7) Adjust multimeter (dc mode) controls to measure microvolts.
(8) Press and hold power meter No. 2 FINE ZERO control and record multimeter
indication as V0.
(9) Release power meter No. 2 FINE ZERO control.
(10) Set synthesized signal generator RF output pushbutton to ON position.
(11) Adjust synthesized signal generator output controls for a power meter No. 2
indication (reference) of 1 mW full scale or suitable power level full scale indication within
range of the TI.
(12) Record multimeter indication as V1.
(13) Disconnect multimeter negative lead from power meter No. 2 VRF and connect
multimeter negative lead to power meter No. 2 chassis ground. Record multimeter
indication as Vcomp.
(14) Calculate and record the power level from the below listed formula as P1:
2 VCOMP (V1 - V0) + V02 - V12
P1 =
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 11 f 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 synthesized signal generator and connect
equipment as shown in figure 8, CONNECTION B.