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3.12.4 Triggering
the Analog Output (XV TRIG)
By using XY TRIG, you can start and stop the analog out-
put. In this manner, you can stop the analog output, load
the plotter with paper, and then initiate the plotting
se-
quence. In addition,
you can halt the plotting
process at
any time simply by pressing XY TRIG. When halting the
plot in this manner, the pen will lift and return to the home
position.
XY TRIG is also used in other XY modes to up-
date the analog output.
As with the remaining
XY mode keys, you must press
SHIFT first to initiate the mode.
3.125 Scaling
the Analog
Output
(XV ZOOM)
In most cases, a measurement
buffer will be larger than
the analog output viewed data. In those cases, it may be
necessary to apply a scaling factor in order to get a better
resolution
of the sampled measurement.
You can program a scaling factor to effectively increase the
magnification
of the plot with the XY ZOOM key If the
scaling factor is 1, the complete measurement
buffer will
be reflected in the analog output.
If the scaling factor is
2, only half the measurement
will appear, and so on.
_.
The minimum
value for the scaling factor is 0.1, and the
maximum
value is 1000. The resolution
of the scaling fac-
tor is 0.1, thus it is possible to program a scaling factor of
1.4. For example, the total number of samples reflected in
the output would be N/,.,. With 900 samples, the number
of samples reflected in the output would be 90011.41642.
Program a scaling factor by using the following
procedure:
1. Press SHIFT XY ZOOM.
The instrument
will then
display the presently
programmed
scaling factor. For
example, the display might show:
XYZOOM
= 1.0
2. You can change the scaling factor in one of two ways.
Either press the desired numeric key and then ENTER,
or use the Uprange or Downrange
keys to increment
or decrement the displayed value. In this case, it is not
necessary to press ENTER, as the value is entered
automatically.
During the entry process, you can press
the CANCEL
key to return to the previous value.
3. If you enter an invalid parameter, the instrument
will
display an error message.
Figure 3-11 demonstrates how using XY ZOOM can help
zoom in on a portion of a plotted waveform. In (A), a scal-
ing factor 4 is applied, with the result that only 100 of the
400 samples are reflected in the analog output sequence.
In (B), a scaling factor of 1 is applied, so the entire measure-
ment buffer is plotted. In this instance, only every fourth
sample is reflected in the final signal. Thus, an appropriate
scaling factor can be used to effectively increase resolution
in cases where only a portion of a measurement
requires
graphing.
If the XY ZOOM parameter is less than 1, you will be ef-
fectively zooming out from your graph. In this case, other
portions
of the 64k RAM buffer not associated with the
measurement
will become visible in the plot.
3-24
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