HP 3336A - Page 35

Operation
Model
3336A/B/C
3-78. Sweep Marker.
3-79.
Sweep
Marker
Output.
The
Marker
Output
(located
on
the
rear
panel)
produces
a
TTL
high
to
low
level
transition
at
the
programmed
Marker
Frequency
during
the
linear
sweep
up.
This
signal
resets
to
the
high
level
at
the
end
of
sweep.
The
marker
transition
will
not
occur
in
the
sweep
down
or
Log
sweep.
Set
the
Marker
Frequency
by
pressing
ney
followed
by
the
desired
frequency
and
finally
the
appropriate
Units
key.
3-80.
The
Marker
Frequency
can
be
set
anywhere
in
the
sweep
band,
but,
if
it
is
set
within
400
microseconds
of
the
sweep
stop,
the
Stop
Frequency
will
be
increased
until
it
occurs
ap-
proximately
400
microseconds
after
the
Marker.
The
equation
to
determine
the
approximate
maximum
Marker
Frequencies
is:
.0004 x Bandwidth
Max Marker Freq = Stop Freq — Sweep Time
3-81. X-axis Drive.
3-82.
The
X
DRIVE
Output
(located
on
the
rear
panel)
supplies
the
following
signals:
Single
Linear
Sweep:
0
V
at
start
frequency,
increasing
linearly
to
>
+10
V
dc
at
stop
frequency.
Remains
at
final
voltage
until
reset
prior
to
start
of
the
next
sweep.
Continuous Linear Sweep: Increases linearly from 0 V to > +10
V dc during sweep up. Resets and remains at 0 V during sweep
down.
Log Sweep: 0 V at start frequency, increasing to > +10 V dc with
the sweep segments.
The
X
DRIVE
Output
has
a
nominal
voltage
of
+
10.5
V
dc
at
the
end
of
a
sweep
to
be
com-
patible
with
oscilloscopes
requiring
+
10.0
V
for
full
screen
horizontal
deflection.
At
the
end
of
Single
Sweeps
(no
reset),
the
X
DRIVE
voltage
decays
toward
0
V
at
less
than
10
mV
per
second.
3-83. Z-axis Blank.
3-84.
The
Z
BLANK
Output
(located
on
the
rear
panel)
produces
TTL
compatible
voltage
levels
as
follows:
Single Linear Sweep: Low level during sweep from Start to Stop
Frequency. High level at all other times.
Continuous Linear Sweep: Low level during sweep up. High level
during sweep down.
Single Log Sweep: Low level during sweep up. High level at all
other times.
Continuous Log Sweep: Low level during sweep up. High level
momentarily at end of sweep.