HP HP 8753E, User Manual, Page: 296 / 699

Note
After measurement calibration, you can change the power within a range
and still maintain nearly full accuracy. In some cases better accuracy can
be achieved by changing the power within a range. It can be useful to set
different power levels for calibration and measurement to minimize the effects
of sampler compression or noise floor.
If you decide to switch power ranges, the calibration is no longer valid and
accuracy is no longer specified. However, the analyzer leaves the correction on
even though it’s invalid.
The annotation C? will be displayed whenever you change the power after
calibration.
TEST PORT
POWER
--
RANGE NUMBER
1 2 3 4 5 6 7
,
- 5
- 1 0
- 2 5
- 6 0
EXAMPLE.
WILL SET RANGE 3
F O R T H I S L E V E L
K N :
UPPER RANGE
L I M I T
“OPT MUM
RANGE”
LOWER RANGE
L I M I T
Figure 6-6. Power Range Transitions in the Automatic Mode
Applisation and Operation Concepts