Start Amptd, Stop Amptd; How To Set Start And Stop Amplitude Values; How To Stop The Sweep; Auto, Manual, Single - HP 8642A Operating Manual

Operation
Model 8642A/B
Amplitude Sweep (cont'd)
START AMPTD, STOP AMPTD
How to Set Start and Stop Amplitude Values
1. Set specific start and stop amplitude values:
Start Amplitude
[ START AMPTD ) and the value of the desired sweep start end-point (in dBm, V, mV,
or uV). If in the EMF mode, the value can be set in EMF V, EMF mV, or EMF uV.
Stop Amplitude
fSTOP AMPTD") and the value of the desired sweep stop end-point (in dBm, V, mV, or
uV). If in the EMF mode, the value can be set in EMF V, EMF mV, or EMF uV.
2. You can also set last-selected start and/or stop amplitude values by selecting
fSTART AMPTTTI fOFF ON I and [ STOP AMPTTJ1 fOTFOR"! (HP-IB codes:
AAON and ABON).
(To shorten the display of the message "CRUNCH CRUNCH MMMMMMM .160" you
can select either a faster sweep time or Special Function 122, Linear Amplitude
Sweep, while you are setting end-point values.)
How to Stop the Sweep
1. You can stop the sweep by turning off both the start and stop end-point settings:
f START AMPTD I [ OFF ON I fSTOP AMPTDT fT5FF ON I
(HP-IB codes: AAOF ABOF)
When amplitude sweep is stopped, output levels are reduced to the levels described in
Table 3-14, RF.OFF Output Amplitude Levels (on page 3-72). (We recommend you
exit amplitude sweep this way to prevent Parameter Changed messages that are
discussed on page 3-182.)
2. You can also stop the sweep by turning off just one of the end-point settings, for
example:
[-START AMPTD I r o T F ~ o m (HP-IB code: AAOF)
When amplitude sweep is stopped, the output amplitude setting is equal to the
remaining displayed end-point value. Stopping the sweep using the above example
would cause the output amplitude to to be equal to the value of the stop amplitude.
3. During auto or single sweep you can stop the sweep and display the actual output
amplitude by selecting manual sweep.
MANUAL ( rSHIFTl rSTOP FREQ 1 )
Selecting either C M E E S J , C M D , PULSE ( ("SHIFTI C M J ), ("START FREQ I.
("STOP FREQ"! or (TJF"OFF707n will also turn off the sweep but may cause a
Parameter Changed message. (These mesages are discussed in Operating Messages, page
3-182.)
AUTO, MANUAL, SINGLE
How to Select a Sweep Mode
Sweep modes available are auto, manual, and single.
r5TART"A"MPTD~| or f S T O P ^ M P T D l must first be selected before one of the
amplitude sweep modes can be selected.
3-84