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OPERATION
3.12.6 Controlling
the Analog
Output
Viewed
Data (XV PAN)
By using the XY PAN key, you can select the first nwasure-
ment buffer sample to be placed in the analog output buf-
fer, thus effectively
moving the viewed data left or right.
For example,
if the measurement
buffer contains
400
readings, 300 readings will not be seen, assuming the scat-
ing factor set with XY ZOOM is 4. By using XY PAN, you
can control which of those 100 samples you wish to ser.
This key is active only if the XY data source is a measure-
ment buffer, and is inactive otherwise.
The smallest permissible
value is --65,535, and Ihc max.
imum value is: 65,535 (64k).
Program the analog output
window
JS follows:
1. Press SHIFT XY PAN. The instrument
will prompt with
the presently programmed
value of the first buffer Ior,v
tion to appear at the analog output.
For example, the
display might show: XYI'AN = 100. Under these condi-
tions, samples 100.199 will be transmitted out the analog
output,
assuming a scaling factor of 1.
2. To change the value, key in the new digits \vith the
numeric keys and press ENTER, (v increment or decre-
ment
the
displayed
value
with
the
Uprange
or
Downrange
keys. If you use Uprange or Downrange,
it
is not ncccssary to press ENTER to enter the neu v.llue.
3. If an invalid value is entered, the instrument
will displa!
an error message.
Discussion
We can demonstrate
how the XY PAN key can be used to
move the analog output
viewed data with the help of
Figure 3-12. In all cases, the scaling factor is 4, and 400
samples xc
stored in the buffer.
These samples are
numbered
O-399.
In Figure 3-12(A), the XY PAN parameter is zero, with the
result that samples O-99 arc included
in the viewed data,
while samples loo-399 are excluded from the viewed data
and loo-399 do not appear at the analog output.
In (B),
the window
begins at sample 100 and extends through
sample 199. Figures 3-12(C) and 3-12(D) demonstrates
viewed data placement for XY I'AN parameters of 200 and
300, respectively.
3-25
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