You can set the output voltage to any value between +12 VDC and -12 VDC, in 0.1 mV steps. Each DAC is
earth referenced; it cannot float.
Each DAC channel is capable of supplying 15 mA maximum current.
You must limit the DAC output current to 40 mA total for each slot (two DAC channels).
To maintain the rated output accuracy, the load (R
L
in the diagram shown above) must be greater than 1
kΩ.
DAC Errors
The output of a DAC varies with temperature. If possible, you should operate the instrument at a stable tem-
perature and as close as possible to the calibration temperature of the DAC for greater accuracy, or per-
form autocalibration to recalibrate the DAC if the temperature has changed much from calibration
temperature.
The output of a DAC also exhibits two other types of errors: differential error and integral error.
Type of errors Descriptions
Differential error Refers to the smallest possible change in voltage.
The DAC output is not linear, but is stepped as progressively larger (or smaller)
voltages are programmed. The step is in 100 µV.
Integral error Refers to the difference between the programmed voltage and the actual output
voltage from the DAC.
4Measurement Tutorials
228 Keysight DAQ970A User's Guide
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