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SECTION 3
Operation
3.2.2
Rear Panel Description
The following
paragraphs describe the various aspects of
the Model
3930A rear panel,
which
is shown
in
Figure 3-Z.
DIGITAL
OUT (Digital
output)
DIGITAL
OUT is a 36-pin connector used to con-
nect the Model
3930A to the optional
Model
3933A PhaseShifter to form amultiphase
oscilla-
tor.
GI'IB (General l'zqmse Interface Bus connector)
This connector is the 24-pin connector use to con-
nect the Model
3930A to the Gl'IB (IEEE-488
bus). Shielded GPIB cables, such as the Model
7007, are recommended
for bus connections. The
primary
address and output
delimiter
are set
with the GPIB key.
INT TRIG OUT (Internal
tri@v
output)
This BNC connector provides aTTL-level
trigger
output signal. When the external trigger source
is used, the signal applied to the EXT TRIG IN
jack is output. When the internal trigger source is
selected, the internal
trigger oscillator
signal is
output.
SWEEP HOLD IN (Sweep hold input)
This BNC connector accepts a TTL-level
signal
used for sweep hold input. The sweep is halted
as long as the input signal is at a low logic level.
SWEEP SINGL START IN (Single-sweep start
input)
This BNC connector accepts a TTL-level
signal
used to start a single sweep. A single sweep
starts at the falling edge of the input signal.
SWEEP MKR OUT &ueep marker output)
This BNC connector provides a TTL-level
signal
used for sweep marker output. This signal goes
low when the frequency
rises above the marker
0
0
0
frequency during a sweep, and it remains high at
all other times.
SWEEP SYNC OUT (Sweep synchronous
out-
put)
This BNC connector provides a m-level
signal
for sweep synchronous
output. This signal is at
low level while a sweep from the start frequency
to the stop frequency is in progress; it is at a high
level at all other times.
SWEEP X DRIVE OUT (Sweep X-axis drive out-
put)
This BNC connector
provides
the signal for
sweep X-axis drive output. The output voltage
ranges from OV to lOV, and it increases and de-
creases according to the sweep direction
as the
sweep is generated. This output
signal is in-
tended for use as the X-axis drive for an oscillo-
scope or XY recorder.
Air intake port
An air intake port is provided
on the rear panel
for the fan that provides
cooling. Allow at least
four inches of clearance behind the port when in-
stalling the unit near a wall or other rear obstruc-
tion.
When the air filter becomes dirty, remove the air
filter cover, and clean the filter with pressurized
air or wash it with a mild detergent. Make sure
that the filter is completely
dry before installing
it back in the unit. The filter should be cleaned at
least once every three months in a clean environ-
ment, or at least once a month in a dirty environ-
ment.
CAUTION
Immediately
turn off the power to the unit if
thefanceasestooperate.Becarefulnotto
ob-
struct the exhaust ports on the upper and
lower panels. Failure to observe these pre-
cautions may result in instrument
damage.
m
FUSE
V
The fuse protects the main AC power line input.
The fuse can be replaced by disconnecting
the
line cord and unscrewing
the fuse holder. Re-
place only with the type indicated below.
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