NI 5160/5162 Coupling

You can select AC or DC input coupling for the 50 Ω and 1 MΩ input paths. Select AC-coupling if the input signal has a DC component that you want to reject, provided that you are not concerned about low-frequency bandpass flatness. If the signal you want to measure is below the limit of the AC coupling cutoff frequency, a DC input offset adjustment is available. For information about the AC coupling cutoff frequency, refer to the NI 5160 Specifications or the NI 5162 Specifications.