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SECTION 3
Operation
0
When FCTN OUT is OFF, the main output signal
is turned off and open-circuited,
but the SYNC
OUT signal is not affected and remains on.
The liquid crystal display indicates "OFF" in the
upper left cmner when the Model 3930A is in the
FCTN OUT OFF mode (except in the SHIFT or
REMOTE modes).
Note that the factory default setting for FCTN
OUT is ON at power on.
FCTN OUT (Function
output:
wamfom
out-
put)
This BNC jack provides
the waveform
output
signal. The maximum
output
voltage range is
U5V/open
circuit, and the output impedance is
5on.
SYNC OUT LSynchronous output)
This BNC jack provides a TTL-level square wave
signal at the same frequency as the main function
output
waveform.
Note that the duty cycle of
this signal is affected by the variable duty cycle
setting when the square-wave
function
is se-
lected.
AM IN (Amplitude
modulation
input)
The BNC jack is used to apply an external ampli-
tude modulation
signal. 100% modulation
oc-
curs with a flV
input signal, and the input im-
pedance is 1Ok.Q.
EXT TRIG IN (External-trigger
input)
This BNC connector is an input for external TTL-
level signals, which can be used to trigger the
Model 3930A.
EXT TRIG IN is internally
pulled
up to a high
logic level, which means that the external trigger
input will remain hi h with no input signal con-
netted. If the EXT $ trigger smxce is selected
with the unit in the gate oscillation
mode, the
gate signal will be enabled, and the unit will ef-
fectively
be in the continuous
oscillation
mode
with no external trigger input signal applied.
3-10
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