Time; How To Set Sweep Time (Using Sweep Time To Set Amplitude Step Size And Number Of Steps); Auto - HP 8642A Operation And Calibration Manual

Model
8642A/B Operation
Amplitude Sweep (cont'd)
TIME
Auto Sweep
Auto sweep continually repeats the sweep sequence from start amplitude to stop
amplitude:
AUTO
((Jil3IFTJ
[3TART AMPTID ) (HP-IB code: AASA)
The SWPf-:G annunciat.or is continuously displayed. (The auto sweep can be stopped to
display the actual OUlput amplitude by selecting manual sweep)
l\'lanual Sweep
Selecting manual sweep does not start a sweep, but enables the Knob or the Step keys
to control an amplitude sweep:
MANUAL (( SHIFT I ( STOP
FRED)
(HP-IB code: AASM)
Turn the Knob
01
select the Step keys to sweep between end-points. The actual
output amplitude as well as the SWPNG annunciator are displayed during the
amplitude sweep.
HP-IB You can use the step keys (HP-IB: UP, DN) to sweep
IE
the manual sweep
mode since Knob rotation is not possible via HP-IB.
Single Sweep
Selecting single sweep will start or restart a single sweep (if both end-points are set).
Single sweep initiates one sweep only; at the end of the sweep, the output amplitude
remains at the final and-point value:
SINGLE
((SHIFT] CSTOP-7
i
JvfFiTDJ)
(HP-IB code: AASG)
The SWPNG annunciator is displayed for the duration of the single sweep. (The single
sweep can be stopped to display the actual output amplitude by selecting manual
sweep)
(When opera ting the instrument locally, a single sweep can also be con venien tly
restarted by pressing the (
OFf
ON I
key twice when in the single sweep mode. Start
amplitude or stop amplitude must be the active fUllction in order to use the Off/On
function in this way)
How to Set Sweep Time
Sweep time is set using the following procedure:
TI1\1E (l.§,HlfD (START
JRNJ )
and the value of the desired sweep time in s or
ms (
ClillHryJ
or (
KHZ MV )
respectively)
Selecting TIME ( ( SHIFT) (START FREQ] ) alone displays the current sweep time
setting. If sweep time is not specified, the Signal Generator uses the sweep time value
last entered for either frequency or amplitude sweep.
]\;ote that a faster sweep tlIne usualJy results in fewer steps with a larger step size.
The following pages contain detailed information about how to understand the
relatiollShips between sweep span, sweep timE, step size, and number of steps. If you
are not interested in these details, you can just adjust sweep time until the
approximate desired number of steps or step size is obtained. To skip these sweep time
details,
tUI'Jl
to page 3-92
3-85