Vibro-meter VM600 IOCN Switching card

A system level full-scale gain calibration requires a full-scale voltage to be applied to the inputs. The result of this type of calibration reduces any gain errors that are external to the ADC, along with the gain error of the ADC. Using an input module as an example, the full-scale signal can be applied to the module inputs rather than the ADC inputs for the duration of the calibration so that the gain error of the complete module calibrates. Figure 6 is a block diagram of the AD7124-4 system full-scale calibration using the EVAL-AD7124-4SDZ evaluation board. To perform a system full-scale calibration, a full-scale voltage is input on the AIN0 (1.25 V at gain = 2) with AIN1 connected to AVSS.

Note that the sampled analog input is reduced by 25% within the ADC. 

This scaling is performed so that a full-scale signal is never applied to the Σ-∆ modulator and, therefore, ensures that the modulator is never saturated. It is important to note that the attenuation is corrected by the factor of gain ÷ 0x400000 in the overall calculation. The CN-0381 highlights the improvements in accuracy when gain and offset calibrations are performed on the AD7124-8. The CN-0381 schematic is shown in Figure 8. This system uses the AD7124-8 with a Pt100 temperature sensor resistance temperature detector (RTD) interfaced to the ADC

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