Agilent Technologies FieldFox MW N9913A, Service Manual

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4-12 N9927-90003
Troubleshooting FieldFox Analyzer
Measurement Group Troubleshooting
Inject that 1 GHz CW signal into the Port 2 SA RF Input connector on the instrument as illustrated in
Figure 4-4. From an instrument preset, tune the instrument to 1 GHz, 0 Span. Verify that the input
attenuator (Atten) is set to 10 dB. On the side of the instrument near the RPG tuning knob, there is a
spring door. Open that spring door and locate the IF Out SMB (m) connector. Connect one end of a test
cable to the IF Out connector on the side of the instrument. Connect the other end of the test cable to the
functioning spectrum analyzer. Tune the functioning spectrum analyzer to 33.75 MHz. The I.F. Out
signal level should measure 33.75 MHz at approximately -16 dBm as illustrated in
Figure 4-5.
Figure 4-4. 33.75 MHz I.F. Output Test Setup
Figure 4-5. 33.75 MHz I.F. Output Signal
Since the input attenuator is set to 10 dB, there should be 6 dB of conversion loss from the RF input
connector to the I.F. Out connector.