Chapter 5
Calibration Procedures
© National Instruments Corporation
5-9
AT-MIO-16D User Manual
• For analog output channel 0:
a. Connect the voltmeter between DAC0 OUT (pin 20 on the I/O connector) and AO GND
(pin 23).
b. Set the analog output channel to 0 V by writing 0 to the DAC.
c. Adjust trimpot R7 until the output voltage read is 0 V
±
1.22 mV.
•
For analog output channel 1:
a. Connect the voltmeter between DAC1 OUT (pin 21 on the I/O connector) and AO GND
(pin 23).
b. Set the analog output channel to 0 V by writing 0 to the DAC.
c. Adjust trimpot R3 until the output voltage read is 0 V
±
1.22 mV.
2. Adjust the analog output gain.
Adjust the analog output gain by measuring the output voltage generated with the DAC set at
positive full scale (4,095). This output voltage should be V+fs
±
1/2 LSB. For unipolar output,
V+fs = +9.99756 V, and 1/2 LSB = 1.22 mV.
•
For analog output channel 0:
a. Connect the voltmeter between DAC0 OUT (pin 20 on the I/O connector) and AO GND
(pin 23).
b. Set the analog output channel to +9.99756 V by writing 4,095 to the DAC.
c. Adjust trimpot R5 until the output voltage read is +9.99756 V
±
1.22 mV, that is, between
9.99634 and 9.99878 V.
•
For analog output channel 1:
a. Connect the voltmeter between DAC1 OUT (pin 21 on the I/O connector) and AO GND
(pin 23).
b. Set the analog output channel to +9.99756 V by writing 4,095 to the DAC.
c. Adjust trimpot R4 until the output voltage read is +9.99756 V
±
1.22 mV, that is, between
9.99634 and 9.99878 V.
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