Vibro-meter VM600 IOC4T output card

The precision Σ-Δ ADC portfolio from Analog Devices has embedded calibration modes that can adjust the ADC conversion results of the ADC due to the gain and offset errors. These Σ-Δ ADCs have on-chip registers to store the calibration coefficients. As part of the overall ADC conversion process, these coefficients automatically correct the ADC conversion result for both gain and offset errors. The offset calibration coefficient subtracts from the result prior to multiplication by the gain error coefficient.

INTERNAL ZERO-SCALE OFFSET CALIBRATION

 For an internal zero-scale offset calibration, the selected positive input pin automatically disconnects and internally connects to the selected negative analog input pin. Therefore, ensure that the voltage on the selected negative pin does not exceed the allowed limits and ensure that any excess noise and interference are not present. Figure 3 shows a block diagram of the internal connection, positive analog input (AINP) and negative analog input (AINM).

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