Chapter 7 345
General Troubleshooting
Error Messages
5. If the delta MKR frequency is between 90 kHz and
110 kHz, the 100 kHz resolution bandwidth is
working properly. If the frequency is outside these
limits, read the following information on the A4 cal
oscillator sweep generator.
If the 100 kHz resolution bandwidth works properly,
the cal oscillator sweep generator is failing to sweep its
oscillator frequency at the correct rate. The error is
detected in sweeping on the skirts of the 100 kHz
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 below. Check the sweep
generator with the following steps. Refer also to the
“300 Hz to 3 kHz Resolution Bandwidth Out of
Specification” troubleshooting text in Chapter 9 , “IF
Section.”
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
9 , “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.
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