RevPi AIO ADC Data Rate

The RevPi AIO expansion module uses a so-called delta-sigma converter of the type ADS 1248. This converter has an adjustable data rate, which is closely related to the frequency curve of the digital filter contained in such a converter. Detailed diagrams of the frequency responses obtained for each setting are given in the ADS 1248 data sheet. Important for your measurements is here that low-frequency interfering signals, like for example a 50 Hz humming, can only be effectively suppressed at settings from 5 to 20 Hz. You will get the highest measurement accuracy with these settings. However, this also reduces the update rate of the data values in the process image. The context is as follows:

Note that the table values for the 320 Hz and 640 Hz settings are maximum values only. The actual update rate achieved can be significantly lower in this area due to the load on the PiBridge. The load depends on your configuration and therefore the respective update rate for these ADC_DataRates can only be determined experimentally on your system and with your configuration. In general, these settings are therefore not recommended.