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7. External Leveling
Description and Procedure
he synthesizer is set up to externally level using a negative crystal detector.
A DVM measures the crystal detector DC output. A 1000 pf capacitor across
the DVM input limits the e ect of any small signals generated by the DVM.
he synthesizer power level is set to the minimum allowable limit and then is
increased until the power output is leveled. he external leveling voltage is
then measured and compared to the minimum speci cation. Next, the output
power is increased until the maximum leveled power is reached. he leveling
voltage is measured and compared to the speci cation.
he synthesizer must meet the power
atness speci cation
Note
before proceeding with this test.
1. Preset all instruments shown in Figure 2-8 and let them warm up for at
least one hour.
Figure 2-8. External Leveling Test etup
Digital Voltmeter
Crystal Detector
Crystal Detector
Capacitor 1000 pf
HP 8360
Equipment
HP 3456A
HP 33330E (HP 83640A/50A)
HP 33330D (HP 83620A/22A/23A/24A/30A)
HP P/N 0160-4574
Performance Tests
2-37
External Leveling
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