How To Select Stepped Frequency Sweep; How To Select Phase Continuous Frequency Sweep (Special Function 123); Start Freo, Stop Freo; How To Set Start And Stop Frequencies - HP 8642A Operation And Calibration Manual

Operation Model 8642A/B
RF Frequency Sweep (cont'd)
Procedures
Note: Put the instrument in its initialized state by selecting ( INsTR PRESET)
3-50
How to Select Stepped Frequency Sweep
SPCL 123
Stepped Frequency Sweep is turned on by selecting the sweep mode (auto, manual, or
single), sweep time, and the start and stop frequencies (procedures for selecting these
parameters are described below). Note that if the sweep mode has
not
been selected since
the last time Instrument Preset has been selected, auto sweep is automatically selected
and causes the Signal Generator to begin sweeping immediately after end -points are set
(The SWPNG annunciator indlcates that a sweep is occurring.) If Stepped Frequency
Sweep is desired but Phase Continuous Frequency Sweep (Special Function 123) is on,
Phase Continuous Frequency Sweep Off (Special Function 223) must be selected.
However, before Special Function 223 can be selected, one of the start or stop
frequencies must be turned off (using a procedure from "How to Stop the Sweep" below).
How to Select Phase Continuous Frequency Sweep (Special Function 123)
Phase Continuous Frequency Sweep is turned on by first selecting Special Function 123,
then, by selecting the sweep mode (auto, manual, or single), sweep time, and start and stop
frequencies (procedures for selecting these parameters are described below) Note that if
the sweep mode has not been selected since the last time Instrument Preset has been
selected, auto sweep is automatically selected and causes the Signal Generator to begin
sweeping immediately after end-points are set. (The SWPNG annunciator indicates that
a sweep is occurring.) If Phase Continuous Freq uency Sweep is desired but Stepped
Frequency Sweep is on, one of the start or stop frequencies must be turned off (using a
procedure from "How to Stop the Sweep" below) before Phase Continuous Frequency
Sweep (Special Function 123) can be selected.
START FREQ, STOP FREQ
How to Set Start and Stop Frequencies
1.
Set specific start and stop frequency values:
Start Frequency
l§l1\R I FREQ:J and the value of the desired sweep sta rt end -point (in GHz, MHz, kHz,
or Hz).
Stop Frequency
!
STOE FR8dJ and the value of the desired sweep stop end-point (in GHz, MHz, kHz; or
Hz)
2. You can also set last -selected start and/or stop frequency values by selecting
c§'TART
FREQ ) (OFF
ON ) and/or
(~TOP
FREQ ) (
OFF
ON I (HP-IB codes: FAON
and FBON)
How to Stop the Sweep
1 You can stop the sweep by turning off both the start and stop end-point settings
[gIAR
r
FREQ]
CQFFTIf,r) CSTOPttiBD
C9B-=--oFD
(HP-JR codes. FAOF FBOF)
When sweep is stopped, the output frequency setting is eqllal to the end-point value that
was turned off last. (We recommentl you exit frequency sweep this way to prevent
Parameter Changed messages discussed on page 3-182)
L You can also stop the sweep by tnrning off just one of the end-point settings (whel'
both end-points are set), for example
[8TARTfREQ]
CQFF ON ) (HP-IB code. FAOF)
When sweep is stopped, the output frequency setting is equal to the remall1ing displayed
end-point value (the value of the stop frequency) We recommend you turn off
frequency sweep this way when you want to set a function to
OC('I[
during a frequency
sweep (for example, AM)