Use DIFF input connections for any channel that meets any of the following conditions:

  • Your application requires input ranges other than ±10 V.
  • The input signal is low level and requires greater accuracy.
  • The leads connecting the signal to the device are greater than 3 m (10 ft).
  • The input signal requires a separate ground-reference point or return signal.
  • The signal leads travel through noisy environments.
  • Two analog channels, AI+ and AI-, are available for the signal.

DIFF signal connections reduce noise pickup and increase common-mode noise rejection. DIFF signal connections also allow input signals to float within the working voltage of the device.

Refer to the Taking Differential Measurements section for more information about differential connections.