Agilent Technologies 8590 Series Service Manual page 576

Softkey Descriptions
Softkey Descriptions
If the error message POS-PK FAIL is displayed, the
mean of the data from the positive-peak detector is
less than the mean from the sample detector data.
2. Sample-Detector Check and error message SAMPLE
FAIL.
The test checks switching for the sample detector.
The peak-to-peak amplitude of the noise floor for the
sample detector should be wider than the noise floor
for the positive-peak detector.The test detects the
wider noise floor by statistically comparing the
peak-to-peak amplitude of the noise floor for the
sample detector to the noise floor for the
positive-peak detector.
If the error message SAMPLE FAIL is displayed, the
standard deviation of the data from the sample
detector is less than the standard deviation of the
data from the positive-peak detector.
3. Video-Bandwidth Check and error message VID-BW
FAIL.
The test checks video-bandwidth switching by
stepping the analyzer from the widest video
bandwidth setting to the narrowest. The test detects
switching activity by comparing the peak-to-peak
amplitude of the noise floor for each video
bandwidth.
If the error message VID-BW FAIL is displayed, the
peak-to-peak amplitude did not decrease when a
narrower video bandwidth was switched on.
4. Resolution-Bandwidth Noise Check and error
message RES-BW NOISE FAIL.
The test makes a relative comparison of noise-floor
amplitude for each resolution bandwidth.
The test compares the noise-floor amplitude of each
resolution bandwidth to that of the next, narrower
resolution bandwidth.
If the error message RES-BW NOISE FAIL is
displayed, a decrease in the noise floor amplitude did
not occur when the test switched to the narrower
bandwidth. The test displays the narrower
bandwidth as the test failure and displays all
bandwidths that fail.
576 Chapter 13