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Before shipping your signal generator, NI calibrated your device to ensure that all features are within specifications.
Calibration is a set of operations that compares the values indicated by a measuring instrument or measuring system to the corresponding values realized by external standards. You can use the results of calibration to determine the measurement error and can then correct for it in the adjustment process.
The calibration process consists of verifying, adjusting, and reverifying a device. During verification, you compare the measured performance to an external standard of known measurement uncertainty to confirm that the product meets or exceeds specifications. During adjustment, you correct the measurement error of the device by adjusting the calibration constants and storing the new calibration constants in the EEPROM. The host computer reads the calibration constants and the software uses them to compensate for errors in the data and to present calibrated data to the user.
For more information about calibrating the signal generator, refer to the device calibration procedures.
For more information about calibration in general, refer to ni.com/calibration.