Hi Joseph, For the noise i have next results: Settings Board: bipolar supplies (JP11 2-3), internal reference enable (JP9 OFF and software enable), Script: Basic startup with Datarate @ 8kSPS 1) Calibrator connected j10 1-2, buffer on. Input voltage 1V. it's ok. 2) Calibrator connected j10 1-3, buffer OFF. Input voltage 1V. and increse 3) Calibrator connected j10 1-3 by resistance divider, buffer OFF. Input voltage 180V, resistance divider 1MOm + 5.5kOm. Then in j10 just about 0.99V and increase 4) Calibrator connected j10 1-2 by resistance divider, buffer on. Input voltage 180V, resistance divider 1MOm + 5.5kOm. Then in j10 just about 0.99V and increase 5) Calibrator connected j9 1-2 by resistance divider. Input voltage 180V, resistance divider 1MOm + 5.5kOm. Then in j9 just about 0.99V. Calibrator groundin connect to EVM GND As you can see, the noise is periodic = 50Hz (our network). Calibrator n4-16. ADS131 allows to measure a constant signal?
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