Specifications

Analog Input Modules
31007715 6/2008 229
These parameters are provided only for sensor compensation, not for scaling. The
module is able to measure over the physical range of +1 to 5 VDC, 0 to 5 VDC,
0 to 10 VDC, +/-5 VDC, and +/-10 VDC. An offset adjustment is performed on the
low end of the range, and a max count adjustment is performed on the high end of
the range.
An ideal linear representation of analog input voltage (one with default offset and
maximum count) is given by the following formula:
C
n
= (V
ai
- 1 V) * 8000
where C
n
is the numerical count and V
ai
is the analog input voltage.
Operating Range +/-10 VDC
For example, in the +/-10 VDC operating range, if you use the Advantys
configuration software to calibrate an offset of 64 at 0 VDC and a max count of
32 576 at +10 VDC, the system could be represented as follows:
Here are some voltage representations after calibration with offset and max count:
V
ai
Uncalibrated Calibrated
-10 VDC -32 448* -32 000*
0VDC 64 0
+10 VDC 32 576 +32 000
* For the STB AVI 0300 module, the calibration of the negative value is determined by
extending the linear equation determined by the offset at 0 VDC and the max count at
+10 VDC.
32 576
32 000
10.18 V
10 V
-10 V
-10.15 V
-32 448
-32 000
n
ai
V
C
c
a
l
ib
r
a
t
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d
u
n
c
a
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