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Chapter 1 Performance Tests
Test 5: Power Meter Reference Level
19
Disconnect the Multimeter's negative test lead from the 432A Power Meter's
V
connector, and connect it to the 432A Power Meter's chassis ground.
RF
20
Observe the reading on the Multimeter, and keep a record of this value
as V
.
COMP
21
Calculate the output level of the 53147A/148A/149A's power reference
oscillator (P rf ) using the following formula:
Prf =
Where:
P rf = Power reference oscillator output level
V comp = previously recorded value
V 1 = previously recorded value
V 0 = previously recorded value
R = previously recorded value
CalibrationFactor = value for thermistor mount at 50 MHz (traceable to NIST)
Assembly Level Service Guide
2 V
( V
– V
) + V
comp
1
0
4R (Calibration Factor)
2
2
– V
0
1
1-37
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Troubleshooting
