What does no minimum sampling rate in NI 6120 imply?

[rams75apr]

I was going through the NI 6110/6111/6115/6120 series of NI DAQ. I found that the input characteristics for NI6120 show "no minimum " sampling rate for NI6120, whereas NI6110/6111 has a minimum of 1 kS/s and NI6115 has a minimum of 20kS/s. What does this imply?

[Seth_B.]

The NI 6110, 6111, and 6115 have minimum sampling rates due to the characteristics of the analog input circuitry.  Essentially, on those devices if you sampel too slowly the integrity of the samples begins to degrade.  The NI 6120 uses different analog circuitry and doesn't have this limitation.  With the NI 6120, if you want to sample hardware timed once every hour, you could do that with the 6120.