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Mode
Single-Ended
mA
Differential
Gain
1
2
4
5
8
10
16
20
4
1
2
4
5
8
10
16
20
0
1
2
3
4
5
6
7
For the single-ended mode there are calibration constants for each channel and for each of
its gains, for a total of 64 sets of calibration constants. The 4–20 mA mode covers 4–20 mA
(actually 0–25 mA) currents. Separate calibration and read-back routines are provided for
this. Since only one range of current measurement is provided, these routines use only one
gain (4). One set of calibration constants is provided for each of the eight input channels.
The differential-mode routines use a pair of input channels to make measurements. In this
case, calibration constants are stored for each pair of channels and for each of the eight
gains, for a total of 32 sets of calibration constants.
When a calibration is performed, it fills in one of the squares in the table with a set of cal-
ibration constants representing the corresponding mode, channel, and gain. These con-
stants are stored in flash memory on the A/D Converter Card, and are thus maintained
even when power is been removed from the A/D Converter Card. Note that calibration
constants are stored for each of the modes. Since A/D converter read routines select the
appropriate calibration constants based on the mode, it is possible for software calls to
move from one mode to another without recalibration.
3.4.2.3 Calibration Recommendations
It is imperative that you calibrate each of the A/D converter inputs in the same manner as
they are to be used in the application. For example, if you will be performing floating dif-
ferential measurements or differential measurements using a common analog ground, then
calibrate the A/D converter in the corresponding manner. The calibration table only holds
calibration constants based on mode, channel, and gain. Other factors affecting the cali-
bration must be taken into account by calibrating using the same method, mode, and
gain setup as in the intended use.
It is not necessary to fill out the entire calibration table. Only the entries associated with
the modes, channels, and gains that you will be using are necessary. This fact can be used
to simplify and speed up the calibration process.
60
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