S Series Calibration
Your device uses hardware calibration to adjust the analog circuitry. This calibration is done with calibration digital-to-analog converters, called calDACs, that fine-tune the analog circuitry. The calDACs must be programmed (or loaded) with certain numbers called calibration constants. Those constants are stored in nonvolatile memory (EEPROM) on your device or are maintained by NI-DAQmx. NI recommends that you self-calibrate your device just before a measurement session but after your computer and the device have been powered on and warmed up for at least 15 minutes. You should allow this same warm-up time before performing any calibration of your system. Frequent calibration produces the most stable and repeatable measurement performance. The device is not harmed in any way if you recalibrate it often.
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Note Calibrating your MIO or AI device takes some time. Do not be alarmed if the DAQmx Self-Calibrate or Adjust S Series Calibration function/VI takes several seconds to execute. |
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Note For best results, stop any ongoing tasks and disconnect any unnecessary external connections before running calibration. |
Calibration Constant Loading by NI-DAQmx
NI-DAQmx automatically loads calibration constants into the calDACs whenever you call functions/VIs that depend on them. The following conditions apply:
- One set of calibration constants is required for each analog input channel on an S Series device. Within this set of calibration channels, different calibration constants are stored for each analog input range supported by the S Series device. When you configure an acquisition, NI-DAQmx automatically loads the calibration constants for each channel, based on its configured input range.
- One set of calibration constants is required for each analog output channel. When an you configure analog output generation, NI-DAQmx automatically loads the calDACs for each channel configured.
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