Procedure 5. Trim Sweep; Adjusting The 8340/41 Trim Sweep; Adjusting The 8350 Trim Sweep - Agilent Technologies 8510C Service Quick Reference Manual

Procedure 5. Trim Sweep

Trim Sweep performs a different function for 8340/41 and 8350 sources. For 8340 sources
set for ramp sweep mode, it is used to adjust the band-switch points to minimize the
frequency difference between the end frequency of one band and the start frequency of the
next higher band. Trim Sweep is not used in the step-sweep mode.
For 8350 sources, trim sweep is adjusted to provide the best frequency accuracy. The trim
sweep setting is saved as part of the instrument state when you press
[INSTRUMENT STATE n]
calibration set. Trim sweep is set to zero by
NOTE In an extreme case you may need to use the 85102 test set adjustment
software to adjust A20, the 85102 Sweep Board (part number 08510-10024,
Rev A.01.10).

Adjusting the 8340/41 Trim Sweep

If you select ramp sweep mode using an 8340/41 source, set TRIM SWEEP to provide the
minimum frequency difference between the band switch points in ramp mode as follows:
1. Press
RECALL, [MORE], [FACTORY PRESET]
2. Connect measurement PORT 1 to measure PORT 2 (through connection). Press
3. Set the ,
START STOP, CENTER, SPAN
4. Press
STIMULUS MENU, [STEP].
5. Press
[DATA→MEMORY 1]
°
be a flat line at 0
6. Press
STIMULUS MENU, [RAMP]
transition at the band switch points. Sharp transition indicate the need to adjust trim
sweep.
7. Press
CAL, [MORE], [TRIM SWEEP]
minimum phase change at the band switch points. When the best (flattest) phase trace
is achieved, press
appropriate measurement calibration.

Adjusting the 8350 Trim Sweep

Set TRIM SWEEP to provide the best frequency accuracy as follows:
1. Press
RECALL, [MORE], [FACTORY PRESET]
2. Connect measurement PORT 1 to measure PORT 2 (through connection). Press
3. Set the ,
START STOP, CENTER, SPAN
4. Press [
DATA→MEMORY 1]
8510C Service Quick Reference Guide
, and as part of the limited instrument state saved when you save a
controls to sweep the frequency range of interest.
When the sweep is complete, press
, [ . When the next sweep is complete, the trace should
MATH (/)]
.
. The displayed trace may exhibit a sharp phase
. Then use the knob to adjust the phase trace for
SAVE, [INSTRUMENT n]
controls to sweep the frequency range of interest.
, [ . When the next sweep is complete, the trace should
MATH (/)]
.
[FACTORY PRESET]
. Set for display.
S21
to save this setting. Now proceed with the
. Set for display.
S21
8510C Adjustments
Procedure 5. Trim Sweep
SAVE,
.
PHASE
DISPLAY.
.
PHASE
3-7