The switching time of the isolation system is several milliseconds, which limits the "all channel" sampling rate to something on the order of 500 samples per second. The system will give 22 ENOB (effective number of bits) at 500 samples per second. The ideal sample rate for extremely noise sensitive applications is an even multiple of the AC line frequency where you live (60Hz in US, 50 Hz in Europe), since line frequency noise is generally the largest source of low frequency noise. By sampling at exactly line frequency (50 or 60 Hz) you can get over -140db line frequency noise reduction, so this is what we would recommend, for extremely noise sensitive applications (sampling at multiples of line frequency is necessary for reasonable noise figures on any DAQ system). At 60Hz the Tekdaqc will achieve 23.8 bit ENOB.
But where the Tekdaqc really shines is in it's ability to achieve very low noise at extremely low signal levels. Many A/D converters will achieve reasonably high resolution at data rates similar to the Tekdaqc but most of these A/D systems will be so overwhelmed by noise that the "noise free resolution" will be much much lower than the ENOB. The Tekdaqc can achieve noise levels of 130nv at 60 Hz sampling rate, which is over 21 bits of actual noise free, usable data, a number that virtually no other DAQC system can come close to.