Data Translation DT9837, User Manual

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Chapter 8
116
Calibrating the Analog Output Subsystem
This section describes how to use the calibration utility to calibrate the analog output
subsystem of a DT9837, DT9837A, or DT9837C module.
To calibrate the analog output circuitry, you need to connect an external precision voltmeter to
analog output channel 0 of the DT9837, DT9837A, or DT9837C module.
Do the following to calibrate the analog output circuitry:
1. Select the D/A Calibration tab of the calibration utility.
2. Connect an external precision voltmeter to Analog Output 0 (DAC Ch0) of the DT9837
Series module.
3. In the DAC Output Voltage box, select – 9.375 V for the DT9837 and DT9837A, or – 2.75 V
for the DT9837C.
4. Adjust the offset by entering values between 0 and 255 in the DAC 0 Offset edit box or by
clicking the up/down buttons until the voltmeter reads –9.375 V for the DT9837 and
DT9837A, or –2.75 V for the DT9837C.
5. In the DAC Output Voltage box, select 9.375 V for the DT9837 and DT9837A, or 2.75 V for
the DT9837C.
6. Adjust the gain by entering values between 0 and 255 in the DAC 0 Gain edit box or by
clicking the up/down buttons until the voltmeter reads 9.375 V for the DT9837 and
DT9837A, or 2.75 V for the DT9837C.
Note: At any time, you can click Restore Factory Settings to reset the D/A calibration
values to their original factory settings. This process will undo any D/A calibration settings.
Once you have finished this procedure, the analog output circuitry is calibrated. To close the
calibration utility, click the close box in the upper right corner of the window.