Scans by ArtekMedia © 2007
Posi!ion and Grid
!he Recording
Area
Displaying and
Labeling Buffered
Data Points
5.
Position and grid a recording area to receive the selected data as follows.
(Refer to Chapter 3 for details.)
a. Position
ZERO
and
FUL.L. SCAL.E
to establish the size and location of the
recording area.
b. Grid the recording area.
6.
Press
PL.OT BUFFER
to plot the selected variables (buffer contents) on the
prepared recording area.
For buffered recordings, the HP 7090 automatically makes pen selec
tions that correlate to your Y-axis channel selection(s) - pen 1 is used
for
CHAN
1,
pen
2
for
CHAN
2,
and pen 3 for
CHAN 3.
If more than one Y-axis channel has been selected for plotting, the chan
nels are plotted in numerical order, beginning with the lowest-numbered
channel.
The pen is lifted when the contents of all selected buffers have been
plotted. If you want to stop a buffer plot before it is finished, press
STOP
(doing so will not erase the current buffer contents).
7.
Repeat steps
4-6
to create duplicate or alternative plots of the buffer
contents. Versus-time or versus-chan3 plots can be drawn from a single
buffer-fill process.
The HP 7090 data display mode includes two different functions, labeled
INPUT
and
PEN POSITION
on the front panel. The pen position function is
normally used to locate and label points of interest on buffl;r plots. Access
ing the pen position function allows you to display the contents of a selected
buffer on the
LeO
after a buffered recording has been performed. The
HP 7090 can also mark and label the coordinates of selected data points.
To display and label buffered data points, perform the following steps:
1. Select the channel whose buffer contents are to be displayed by using
the Y-axis
CHANNEL. SEL.ECT
pushbuttons. Only one channel may be
selected at a time. Select the appropriate X-axis variable
(
TIME
for versus
time plots,
CHANNEL.
3
for versus-chan3 plots).
2.
Access the pen position function by using the
DATA DISPL.AY
selector to
light the
PEN POSITION
indicator (the pen position fundion is not access
ible if the buffers are empty).
When the pen position function has been selected, the
pen
and paper
will
move so that the pen is positioned over the recording area coordinates of
the first buffered data point specified by the X- and Y-axis selections
made in step 1. At the same erne, the
LeO
will display the Y-axis coordi
nate (voltage) of the first buffered data point.
3. Use the pen
CURSOR CONTROL.S
to access the buffered data. Hold down
the ... or
6
cursor control to move through the buffer from the beginning
(data point #1) to the end (data point #1000). Similarly, hold down the
<ill
or .. cursor control to move through the buffer in the opposite direction.
4-8
Performing Direct and Buffered Recordings
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