Chapter 6 323
General Troubleshooting
System Analyzer Programming Errors (100 to 150)
resolution bandwidth.
A properly operating sweep generator generates a
series of negative-going parabolas. These parabolas
generate the sweeps used to adjust resolution
bandwidths of 10 kHz and less. Check the sweep
generator with the following steps. Refer also to "300
Hz to 3 kHz resolution bandwidth out of specification"
in the A4 cal oscillator troubleshooting text in Chapter
8.
1. Remove the shields.
2. Connect an oscilloscope probe to A4U804C pin 8.
3. On the spectrum analyzer, press
CAL and FULL IF
ADJ.
4. Approximately 8 seconds after starting the
FULL IF
ADJ, check for negative-going parabolas (similar to
half-sine waves) 5 ms wide and approximately −4 V
at their peak. Refer to Chapter 8, "IF Section," for
more information on the A4 log amp/cal oscillator
assembly.
583 RBW 30K Unable to adjust 30 kHz resolution bandwidth.
584 RBW 100K Unable to adjust 100 kHz resolution bandwidth.
585 RBW 300K Unable to adjust 300 kHz resolution bandwidth.
586 RBW 1M Unable to adjust 1 MHz resolution bandwidth.
587 RBW 30K Unable to adjust 30 kHz resolution bandwidth.
588 RBW 100K Unable to adjust 100 kHz resolution bandwidth.
589 RBW 300K Unable to adjust 300 kHz resolution bandwidth.
590 RBW 1M Unable to adjust 1 MHz resolution bandwidth.
591 LOG AMPL Unable to adjust amplitude of log scale.
592 LOG AMPL Unable to adjust amplitude of log scale.
593 LOG TUNE Limiter calibration tune error from DC logger
calibration.
594 LOG OFST Attenuator calibration offset error from DC logger
calibration.
595 LOG ATTN Attenuator calibration absolute error from DC logger
calibration.
596 LOG FID Fidelity error from DC logger calibration.
597 LOG OFST Fidelity offset error from DC logger calibration.
598 LOG OFST Fidelity offset unstable from DC logger calibration.
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