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OPERATION
3.12 USING THE ANALOG
OUTPUT
The analog output of the instrument
can be used to drive
display devices such as oscilloscopes,
CRTs, plotters and
strip chart recorders. The Y output provides the amplitude
information,
while the X output provides horizontal
posi-
tion information
for the graphing
devices requiring
such
information.
The Z output provides a blanking
or pen lift
signal, depending
on the type of graphing
device.
The following
paragraphs describe the various operating
modes of the analog output, including
programming
and
output
connections.
XY BUTTONS
3.12.1 Analog
Output
Connections
'The analog output has three jacks, which are shown in
Figure 3-7. The X output provides position
or time infor-
mation in the CRT or plotter modes, the Y output provides
amplitude
information
in all three modes, and the Z out-
put provides a blanking
signal in the CRT mode, a pen
up signal in the plotter mode, and a trigger signal in the
oscilloscope
mode.
The Y output is unipolar,
with the amplitude
varying be-
tween 0 and the programmed
full scale value (default,
1OV). The minimum
Y output (OV) corresponds to a minus
full range input,
while the maximum
Y output
is equal
to a plus full range input.
For example, on the 32OmV
range, a -327.68mV input voltage will yield a Y output
value of approximately
OV, while a +327.68mV input will
give the full scale value.
The X output is also unipolar
with OV corresponding
to
the position of the first sample, and the programmed
full
scale value corresponding
to the position
of the last
SiXllpl~.
The Z output is factory programmed so that low is OV and
high is 5V. The high level can be changed to +15V as
discussed in paragraph 7.10.
Figure 3-7. Rear Panel Showing ANALOG OUTPUT
Jacks
Typical connections for using the analog ~mtput in the plot-
ter mode are shown in Figure 3-X. In this instance, the ill-
strument is driving a plotter. Note that the X output is corv
netted to the X input of the plotter, the Y output is cow
netted to the Y plotter input, while the % output is con-
nected to the pen up input of the plotter. Typical COIIIWC-
tions for using the analog output in the oscilloscope
,~nd
CRT modes are shown in Figures 3-9 and 340
CAUTION
Analog output common (outer
ring)
is con-
nected to chassis
ground
and
cannot
be
floated.
NOTE
Shielded cable should be used for analog c,utput
connections
to minimize
the possibility
of EMI
radiation
Figure 3-8. Typical Plotter Connections
3-21
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