Operation
RF Frequency Sweep (cont'd)
HP-IB
Keys
GHz
MHz
kHz
Hz
s
ms
SPCL
Codes
GZ
MZ
KZ
HZ
SC
MS
SP
Keys
START FREQ
STOP FREQ
SWEEP TIME
AUTO
MANUAL
SINGLE
OFF ON
Codes
FA
FB
ST
FASA
FASM
FASG
FAOF,
FBOF
FAON,
FBON
Comments Sweep Time Is Common to All Sweeps
Sweep time is common to amplitude sweep and frequency sweep. If sweep time is not
specified, the Signal Generator assumes the value last selected for either amplitude or
frequency sweep. If this last-selected sweep time value is below the minimum setting
allowed under current conditions, the message "SWEEP TIME ADJUSTED .C21" is
displayed and sweep time is automatically set to the minimum allowed setting.
Phase Continuous Frequency Sweep, Miscellaneous Information
During Phase Continuous Frequency Sweep (Special Function 123), sweep span and sweep
time limitations depend on which frequency band is being used.
The frequency band being used is the center frequency of the sweep, which is one-half
of the sum of the start frequency plus the stop frequency. (The start or stop end-point
could be outside the band being used).
Changing End-Point Values During the Sweep
During auto or single sweep, the Knob, Step keys, and Data keys can be used to change
the start and stop end-points and sweep time values. During manual sweep, the Knob
and Step keys can only be used to perform the manual sweep.
HP-IB. How to Manually Sweep
In manual sweep mode, HP-IB codes "UP" and "DN" can be used to step manually by one
step (each time the code is sent). Knob rotation is not possible via HP-IB.
How to Tell if the Start and Stop Frequency Entries Are Accepted
If the frequency entries are accepted, both values will appear in the display.
If the frequency entries are not accepted, the displayed message will direct you to the
entry error. Sweep span width limitations for Phase Continuous Frequency Sweep
(Special Function 123) are listed in Table 3-12, RF Frequency Sweep Operating
Characteristics (page 3-49), or explained in "How to Set Sweep Time" that begins on page
3-60. For information about sweep span width limitations for Stepped Frequency Sweep,
refer to page 3-51, under "How to Select a Sweep Mode (Auto Sweep)".
Modulation Types Not Possible During Frequency Sweep
During Stepped Frequency Sweep, FM and $M are allowed in manual or single sweep
mode. During Phase Continuous Sweep (Special Function 123), all modulation types are
allowed in all sweep modes. However, the sweep must be stopped to select modulation.
3-64
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