Specifications

Analog Input Modules
204
31007715 6/2008
These parameters are provided only for sensor compensation, not for scaling. An
offset adjustment will move the interpretation of the low end of the range, and a max
count adjustment will move the interpretation of only 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 1400 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
-32 480
-32 000
n
ai
V
C
c
a
l
ib
r
a
t
e
d
u
nc
a
l
i
b
r
a
t
e
d
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