Vibro-meter 200-560-000-113 200-560-101-017 Thermocouple card

shows the performance of precalibration and post calibration results of the AD7124-4 with AIN0 and AIN1 shorted together. After performing external offset calibration, the offset error was reduced and the conversion results were approximately zero volts. The result from the ADC showed 0x7FFF60 or 24 µV offset without calibration. See the AD7124-4 data sheet for more information.

Without Calibration vs. Post System Zero-Scale Calibration

After performing a system zero-scale calibration in low power mode, the offset register was updated to 0x7FFF89. Performing a conversion, the ADC result was 0x7FFFFC (approximately 120 nV average), which is in the order of the noise, approximately 330 nV RMS.

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