National Instruments 320174B-01 - page 126

Calibration Chapter 5
Lab-NB User Manual 5-8 © National Instruments Corporation
For analog output channel 1:
a. Connect the voltmeter between DAC1 OUT (pin 12 on the I/O connector) and AOGND
(pin 11).
b. Set the analog output channel to 0 V by writing 0 to the DAC.
c. Adjust trimpot R9 until the output voltage read is 0 V.
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 ±0.5 LSB. For unipolar output,
V+fs = +9.99756 V, and 0.5 LSB = 1.22 mV.
For analog output channel 0:
a. Connect the voltmeter between DAC0 OUT (pin 10 on the I/O connector) and AOGND
(pin 11).
b. Set the analog output channel to +9.99756 V by writing 4,095 to the DAC.
c. Adjust trimpot R6 until the output voltage read is +9.99756 V.
For analog output channel 1:
a. Connect the voltmeter between DAC1 OUT (pin 12 on the I/O connector) and AOGND
(pin 11).
b. Set the analog output channel to +9.99756 V by writing 4,095 to the DAC.
c. Adjust trimpot R8 until the output voltage read is +9.99756 V.