Vibro-meter 200-560-000-018 Thermocouple module

For a system zero-scale offset calibration, the voltage for calibration must be applied to the ADC input pins. With this type of calibration, the offset of the external circuitry, along with the ADC offset, is diminished from the signal chain. With an input module, for example, the user can short the inputs at the connector terminal so the calibration removes any error due to the signal conditioning as well as the ADC offset. 

Figure 4 shows the set up of the EVAL-AD7124-4SDZ 

evaluation board with AIN0 and AIN1 shorted together. The EVAL-AD7124- 4SDZ is powered by the ADP1720 and uses the ADR4525 as reference and the EVAL-SDP-CB1Z as the evaluation controller board, which is based on the ADSP-BF527 processor. The EVAL-AD7124-4SDZ evaluation board and the AD7124-4/ AD7124-8 Eval+ Software was used. The AD7124-4 was configured as follows:  Channel: AIN0 and AIN1  Pin AIN0 and Pin AIN1 are shorted using LK5 on evaluation board  VBIAS is enabled  Gain = 2  Power mode: full power mode  Output data rate: 50 SPS

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