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Frequency Reference
output
Sweep Z-blank
Marker
The Ref Out 1 MHz connector supplies a 1 MHz
squarewave derived from the frequency reference of the
HP 3324A. The squarewave has a level greater than 0
an can be used to phase-lock an analyzer or
d
other instrumentation to the frequency reference of the
HP 3324A.
A TTL-compatible output is present during a sweep
operation, as follows:
Single sweep:
Continuous sweep:
When the Z-blank output is low, it is possible to
sink current through a relay or another device. The
maximum ratings are:
Maximum current sink: 200 mA
Allowed voltage range:
Maximum power:
(voltage at output x
current)
The marker output is a TTL-compatible output. It
is high at the start of a sweep up, goes low at the
selected marker frequency. It remains low until the end
of the interval in the multi-interval mode, while in the
multi-marker mode the signal goes high again after
approximately 1 ms. No marker output is present during
a log sweep.
Goes low at the start of the sweep,
and high when the sweep stops.
Goes low at the start of the sweep,
high when the sweep stops and
until the retrace time is over, and
then goes low again at the start of
the next sweep.
0 V to +45 V DC
Instrument Operation 3-7
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