Auto, Manual, Single; How To Select A Sweep Mode - HP 8642A Operation And Calibration Manual

Model 8642A/B
Operation
RF Frequency Sweep (cont'd)
3. During auto or single sweep (in Stepped
i
l'cquellcy Swecp) you can stop the sweep
and display the actual output frequency by selecting manual sweep.
MANUAL
([SFHFD [STDPTREQ] )
Selecting either ( FREQ
I, (
START AMPTD
I,
or (STOP AMPTD
I
will also turn off the
sweep but may cause a Parameter Changed message (These messages are discussed on
page 3 -1 82.)
AUTO, MANUAL, SINGLE
How to Select a Sweep Mode
Sweep modes available are auto, manual, and single.
( START FREQ
I
or
(~T~QJ
must first be selected before one of the frequency
sweep modes can be selected.
Au to Sweep
Auto sweep continually repeats the sweep sequence from start frequency to stop
frequency:
AUTO
(("S""F"'il-FT""--') (START AMPTD ) )
(HP-IB code: FASA)
The SWPNG annunciator is continuously displayed. (During Stepped Frequency Sweep,
the auto sweep can be stopped to display the actual output frequency by selecting
manual sweep).
In Stepped Frequency Sweep, auto sweep mode does not allow the following settings:
G
Setting start and stop frequency end-points if one end-point is less than 4.130860
MHz. (Frequency Band 2) with a second end-point greater than 132.187500 MHz
(Frequency Band 6) (For more information about frequency bands, refer to RF
Fr<:qllency, page 3- 39.)
o Setting a sweep across 1057.5 MHz (8642B only).
9
Setting FM or 'PM.
Manual Sweep
Selecting manual sweep does not start a sweep, but enables the Knob or the Step keys to
control a frequency sweep:
MANUAL
([SRIFT-) CSTlW-FREQ-))
O-IP-IB code: FASM)
Turn the Knob or select the Step keys to sweep between end-points. The actual output
frequency as well as the SWPNG annunciator are displayed during the frequency sweep.
HP-IB: You can use the step keys (HP-IB: UP, DN) to sweep in the manual sweep mode
since Knob rotation is not possible via HP-IB.
Single Sweep
Selecting single sweep will start or restart a single .;weep. Single sweep initiates one
sweep only; at the end of the sweep, the output frequency remains at the final end-point
value:
SINGLE {I
SHIFT I ( STOP AMPT[J) ) (lIP-IB code: FASG)
The SWPNG annunciator is displayed for the duration of the single sweep. During
Stepped Frequency Sweep, you can stop the sweep and display the actual output
fl cquency by seleclllig ma nual sweep
(When operating thr instrument locally, a single sweep can also be conveniently restarted
by
pres,ing the
(oFf uN]
key twice when ill the single sweep mode. Start frequency or
stQP flcquency must
:'e
the active functioll in order tl' lise the Off/On funetil,n in this
way)
3-51