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RES-BW NOISE FAIL (H)
During the confidence test routine,
too high for the indicated resolution bandwidth.
Starting with the widest resolution bandwidth, the test compares the
noise floor amplitude of each bandwidth to the noise floor amplitude of
the next, narrower resolution bandwidth. If a decrease in noise-floor
amplitude does not occur, the test displays the narrower bandwidth as a
test failure.
Related Assemblies
Troubleshooting Hints
Chapter 13
for more information about the confidence test routine.
• A high noise floor can be caused by a defective bandwidth control
line.
Look for a change in noise floor level and bandwidth when manually
switching between bandwidths. If no change occurs, check the
bandwidth control lines from the A7 analog interface assembly.
Refer to Foldout 11-1, IF/Control Overall Block Diagram, and
bandwidth control line information in
information.
• A high noise floor can also be caused by loose screws in the IF
assembly section. Make sure the IF assembly cover screws are
properly tightened.
RES-BW SHAPE FAIL (H)
During the confidence test routine,
resolution bandwidth was not within 20% of its nominal value. The
10 kHz, 30 kHz, 100 kHz, 300 kHz, 1 MHz, and 3 MHz bandwidths are
checked and the bandwidths that fail are displayed.
Related Assemblies
A13 bandwidth filter.
Troubleshooting Hints
bandwidths may have drifted since the last time the self-calibration
routines were run. The
for bandwidth error.
If a bandwidth drifts out of tolerance soon after performing
, a bandwidth-filter assembly or bandwidth control line may
AMPTD
be unstable.
1. Check the 3 dB bandwidth of the failed resolution bandwidths
using the
3 dB POINTS
Chapter 14
CONF TEST
A11 bandwidth filter, A13 bandwidth filter.
Refer to the
CONF TEST
Chapter 5
, the 3 dB bandwidth of a
CONF TEST
A7 analog interface, A11 bandwidth filter,
•The bandwidth of the failed resolution
self-calibration routine corrects
CAL AMPTD
softkey.
Analyzer Messages
Interpreting Analyzer Messages
, the noise floor level was
description in
for further
CAL
651
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Troubleshooting
