Scans by ArtekMedia © 2007
The full-scale point is positioned in a manner similar to that illustrated for
the zero point. To position the full-scale point when preparing a recording
area:
1. Press
FUU SCALE
to invoke the full-scale positioning function
(
FULL SCALE
indicator on).
2. Use the pen cursor pushbuttons to move the pen to the desired full-scale
point (upper-right corner of the coordinate system).
3. Press
FULL SCALE
a second time to enter the new full-scale position and
exit the full-scale positioning function (
FULL SCALE
indicator off).
NOTE:
Always exit the full-scale positioning function to prevent accidental
repositioning of the full-scale point
. •
When you position the zero point, the full-scale point is automatically
moved (within the hard-clip limits) with the zero point
so
their relative
locations are maintained. This feature allows you to create equal-sized
plots by moving only the zero point. Because of the simultaneous move
ment. the zero point should always be positioned before positioning the
full-scale point.
The full-scale point should always be located above and to the right of the
zero point (when viewing the recording area with the positive X-axis
extending to your right)_ If the zero and full-scale points are not positioned
in this manner, subsequent plots will be improperly oriented.
Scaling the Recording Area Boundaries
(Preparing the Recording Area: Step 3)
The Total Time
Setup Condition
Before performing a direct or buffered recording, the duration of the
recording is specified using the
TOTAL TIME
setup condition. In addition, the
channel input range(s) of the HP 7090 is established using the channel
RANGE
and
OFFSET
setup conditions.
These setup conditions not only determine the physical boundaries of the
recording, they also determine the scaling ofthe recording area prepared to
receive the data plot. The
TOTAL TIME
setup condition establishes the scaling
of the X-axis for versus-time measurements, and the channel
RANGE
and
OFFSET
setup conditions establish the scaling of the Y-axis. (For versus
chan3 measurements, the Channel 3
RANGE
and
OFFSET
oonditions deter
mine the X-axis scaling.)
Default Value:
1.0 second.
Range of Selectable Values:
0.03
seco
nd to 24 hours. (For direct recordings,
TOTAL TIME
settings of less than 1.0 second are automatically defaulted to
1.0 second when the recording is initiated.)
Measurement recording time is determined by the
TOTAL TIME
setting. For
buffered recordings,
TOTAL TIME
designates the time required for the buffers
to fill. For direct recordings,
TOTAL TIME
determines the actual plotting time.
(Recording time and plotting time are synonymous for the direct recording
mode.)
3-8 Measurement Setup Operations