HP ESA-L1500A, User'S And Calibration Manual

Page: 283 / 326

282 Chapter 9
Performance Verification Tests
19. Residual Responses
Video BW Auto Man
,
3 kHz
Display
,
Display Line On Off
(On),
−
90 dBm
Display, Display Line On Off
(On),
−
36 dBmV
(75
Ω
Input)
6. Press
Single Sweep
and wait for a new sweep to finish. Look for any
residual responses at or above the display line. If a residual is
suspected, press
Single Sweep
again. A residual response will persist
on successive sweeps, but a noise peak will not. Note the frequency
and amplitude of any residual responses above the display line in
Table 9-21 .
7. Press
Frequency
,
↑
(step-up key), to step to the next frequency and
repeat step 6 .
8. Repeat step 7 until the range from 1 MHz to 1.5 GHz has been
checked. (This requires 153 additional frequency steps.) The test for
this band requires about 8 minutes to complete if no residuals are
found. If the on screen annotation is obscuring possible residuals,
just press the ESC key to clear it.
If there are any residuals at or near the frequency specification limits
(1 MHz or 1.5 GHz), it is recommended that a known frequency source
be used as a frequency marker. This will ensure that testing is done at
or below the specification limits.
9. Record the highest residual from Table 9-21 as TR Entry 1 in the
performance verification test record. If no residuals are found, then
record “N/A” in the performance verification test record.
Table 9-21 Residual Responses above Display Line Worksheet
Frequency (MHz) Amplitude (dBm or dBmV)