Agilent Technologies 8510C Service Quick Reference Manual page 28

8510C Adjustments
Procedure 5. Trim Sweep
°
be a flat line at 0
5. Connect an electrical delay of known length between measurement PORT 1 and
measurement PORT 2. The device should have a low loss and exhibit a precisely known
electrical delay, as do the air lines in the 3.5 mm and 7 mm verification kits.
6. Enter the electrical delay of the air line by pressing
. The phase transitions should disappear, leaving a phase trace with some slope.
DELAY]
Any residual slope indicates a need to adjust trim sweep.
7. Press
CAL, [MORE], [TRIM SWEEP]
trace. When the best (flattest) phase trace is achieved, press
[INSTRUMENT STATE n]
measurement calibration.
In the 8350 plug-in firmware at 7 GHz Band Cross 201 MHz span only, phase
NOTE
measurements after trim sweep correction can still result in a
the band cross points due to switching of the RF to the wrong band.
3-8
.
. Use the knob to adjust the phase for a flat phase
to save this setting. Now proceed with the appropriate
RESPONSE MENU, [ELECTRICAL
SAVE,
8510C Service Quick Reference Guide
≥
75° step at