Scans by ArtekMedia © 2007
Establishing the Recording Area Boundaries
(Preparing the Recording Area: Step 2)
A
Recording
Area
Clipping
After deciding which variables are to be plotted, the portion of the paper
to
receive the plot is established by specifying the locations of two movable
points,
zero
and
full scale,
which detennine the boundaries of the recording
area. Following power-up or front-panel initialization, these points are
located at their default positions near opposite corners of the plotter paper,
hut you can reposition them to set the dimensions and locations of your
hardcopy plots.
The following illustration shows the zero and full-scale points positioned
on a sheet of A-size paper. The full-scale point is located near its default
position, and the zero point has been positioned near the center of the
paper. The zero point is used to mark the origin of the recording area
coordinate system. The full-scale point marks the upper X-and
Y-axis
limits
of the recording area, and may be expressed in X,Y coordinates as
(FSx,
FSy). Note that the zero and full-sca1e points establish Quadrants
I,
11,
Ill,
and
IV
of the recording area.
j-FS)!;,
•
•
I-FS)!;,
-FSy)
II
III
Y_AXIS
X·AX1S
IV
FULL SCALE
IFS)!;, FSy)
If
the recording area shown in the preceding illustration was used for
plotting a Channel
1
vs Channel
3
measurement, for example, the zero
point would be the intersection of
0.0
volts (X-axis, Channel
3
input) and
0.0
volts (Y-axis, Channel
1
input). Similarly, the full-scale point would be the
intersection of the X-axis, full-scale voltage
(RANGE
3)
and the Y-axis, full
scale voltage
(RANGE
1).
Other data points would be mapped onto the appro
priate recording area quadrants.
A
recording area can normally be defined that will contain all the data
points measured by the HP
7090
during an individual recording session.
However, the boundaries of the recording area are limited by the size of the
paper used and by the paper-moving mechanism. These imposed limits are
defined as the
hard-clip limits.
The hard-clip limits determine the limits of
pen motion and the area within which the zero and full-scale points can be
3-4
Measurement Setup Operations
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