MM0474
(19) If the valves recorded above are constant within 0.3 percent,
multiply the average of the four readings by the calibration factor of the
power standard assembly at the applicable frequency. To obtain the calibration
factor in percent, multiply the result by 100.
(20) Repeat steps (1) through (19) above for all required frequencies
within the range of the TI.
(21) The calibration factor computed in (19) above for each frequency
checked will be within 3 percent of the calibration factor indicated on the TI.
c. Calibration Factor, 18 to 40 GHz.
(1) Connect the equipment as shown in Figure 11, connection A, for the
applicable frequency of the TI.
(2) Set the power meter (A5) and she power bridge (A4) mount resistance
for 200 ohms.
(3) Set the signal source (A7) AC POWER switch to ON, energize the
remaining instruments, and allow for warmup.
(4) Set up the signal source for a phase-locked leveled output at the
applicable frequency of the TI.
(5) Adjust the main line variable attenuator (B313) for 10 milliwatts
below 26.5 GHz on power meter (A5) or for 5 milliwatts above 26.5 GHz.
(6) Connect the equipment as shown in Figure 11, connection B.
(7) Disconnect thermistor mount (A8) from directional coupler (B10).
(8) On the power bridge, place the reference generator function switch
to NULL and the V-REM-V switch to V.
(9) Adjust the reference generator divider dials for a null on the
reference generator meter.
(10) Place the reference generator function switch on each power bridge
to the RVG position (fully counterclockwise).
(11) Measure the voltage at the RVG terminals of power bridge (A4), using
DC voltmeter (A1). Record the voltage as V1.
(12) Reconnect the thermistor mount to the directional coupler from which
it was disconnected in (7) above.
(13) Measure and record the RVG voltage as V1.
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