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SECTION 3
Operation
Starting a Single Sweep
Press the SINGL START key to initiate a single sweep.
During
a single sweep, the Model 3930A displays
the
sweep frequency,
and the following
message is dis-
played: "SINGL SWEEP EXEC (EXITSWP
OFF)". Yoc
cannot set the frequency
with the FREQ key while the
unit is generating a single sweep.
When the Model 3930A terminates a single sweep, it dis-
plays the terminated sweep frequency along with the fol-
lowing message "SINGL SWEEP END". Once the sweep
has terminated,
you can program the output frequency
with the FREQ key. The MKR OUT and SWEEP SYNC
OUT signals go high, and the X DRIVE OUT signal is set
to OV at the end of the sweep.
Holding/Resuming
a Sweep from the Front Panel
To temporarily
halt execution of
a continuous
or single
sweep, press the HOLD/RESM
key. The Model 3930A
stops the sweep operation immediately,
and it displays
the frequency at which it stopped the sweep. The MKR
OUT, SWEEP SYNC OUT, and X DRIVE OUT signals
maintain
their current values when the sweep is halted.
When a continuous
sweep is paused, the Model 3930A
displays "CONT SWEEP HOLD (EXITSWI'
OFF)"; simi-
larly
the
unit
displays
"SINGL
SWEEP
HOLD
(EXITSWF OFF)" when a single sweep is paused. When
the Model 3930A is in the sweep hold mode, you cannot
program the frequency with the FREQ key.
To reame
a sweep starting at the frequency at which you
stopped sweep operation, press the HOLDJRESM
key
again.
Turning
a Sweep Off to Enable Normal Frequency Pro-
gramming.
Press the SWEEP OFF key during a sweep or sweep hold
to turn off a sweep and enable normal FREQ key pro-
gramming.
The MKR OUT and SWEEP SYNC OUT sig-
nals will be set high, and the X DRIVE OUT signal will be
set to ov.
When the SWEEP OFF or FR?ZQ keys are pressed at the
completion
of a single sweep, during start frequency out-
put, or during stop frequency output, normal frequency
3-32
programming
will
be enabled. In addition,
the MKR
OUT and SWEEP SYNC OLI? signals willbe
set high, and
the X DRIVE OUT signal will be set to OV.
Setting the Output to the Start Frequency
PFSSS
the START STATE key to set the output waveform
to the programmed
start frequency.
In this mode, the
Model 3930A displays the start frequency along with the
following
message: "SWEEP STRT STATE". The MKR
OLJT and SWEEP SYNC OUT signals also go high during
the start frequency mode. The X DRIVE OUT signal is set
tom OV if the start frequency
is lower than the stop fre-
quency; it is set to 1OV if the start frequency is higher than
the stop frequency.
When the Model 3930A is in this mode, pressing
the
FREQ key enables normal frequency programming
with
the FREQ key and sets the X DRIVE OUT signal to OV.
Setting the Output to the Stop Frequency
Press SHIFT STOP STATE to set the output waveform
to
the programmed
stop frequency. While in this mode, the
Model 3930A displays the stop frequency along with the
following
message: "SWEEP STOP STATE".
During the
sweep stop state, the MKR OUT and SWEEP SYNC OUT
signals are set high. X DRIVE OUT is set to 1OV if the start
frequency is lower than the stop frequency; it is set to OV
if the start frequency is higher than the stop frequency.
When the Model 3930A is in this mode, pressing the
FR!?Q key enables normal frequency programming
with
the FREQ key and sets the X DRIVE OLJT signal to OV.
Starting a Single Sweep Using an External Signal
A TTL-level,
falling-edge
signal, applied to the SINGL
START IN BNC connector, starts a single sweep. This sig-
nal performs essentially the same operation as pressing
the SINGL START key.
SINGL START IN is internally
pulled up to a high logic
level, and sweep operation is not affected when the this
connector is left disconnected from external signals.
Holding/Resuming
a Sweep with
an
External Signal
A 'ITL low-level
signal, applied to the SWEEP HOLD IN
BNC connector, places the Model 3930A in the sweep
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