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Chapter 8
Calibrating the Analog Input Subsystem
This section describes how to use the calibration utility to calibrate the analog input
subsystem of a DT9837 Series module.
DT9837 Series modules have separate calibration for each A/D input channel.
Connecting a Precision Voltage Source
To calibrate the analog input circuitry, you need to connect an external +9.3750 V precision
voltage source to the DT9837 Series module. Connect the precision voltage source to the first
channel you want to calibrate; for example, Analog In 0 (AD Ch0).
Using the Auto-Calibration Procedure
Auto-calibration is the easiest to use and is the recommended calibration method. To
auto-calibrate the analog input subsystem, do the following:
1. Select the A/D Calibration tab of the calibration utility.
2. Under the Calibration Settings area of the window, select the sampling frequency, in
3. Under the Automatic Calibration area of the window, select the channel that you want to
4. Verify that the supplied voltage to your selected channel is 0.000 V, and then click OK.
5. Check that the supplied voltage to your selected channel is +9.375 V, and then click OK.
6. Repeat these steps for each analog input channel on the module.
Note: At any time, you can click Restore Factory Settings to reset the A/D calibration
values to their original factory settings. This process will undo any auto or manual calibration
settings.
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Hertz, and the gain that you want to use.
Note: By default, this utility uses DC coupling with the current source disabled. This is
the recommended setting for most users. While changing these settings is not advised for
most users, users with unique applications can change these settings by clicking the
Advanced button.
calibrate from the Type of Calibration drop-down list box, and then click the Start button.
A message appears notifying you to verify that 0.000 V is applied to the channel.
The offset value is calibrated. When the offset calibration is complete, a message appears notifying
you to set the input voltage of the channel to +9.375 V.
The gain value is calibrated and a completion message appears.
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