NI PXI/PCI-5401
ARB Connector

The ARB (PCI) or ARB OUT (PXI) connector provides the waveform output. The maximum output levels on this connector depend on the type of load termination. If the output of the NI PXI/PCI-5401 terminates into a 50 Ω load, the output levels are ±5 V, as shown in the following figure.

If the output of the NI 5401 terminates into a high-impedance load (HiZ), the output levels are ±10 V. If the output terminates into any other load, the levels are as follows:

V_out = ± [ R_L / (R_L + R_O) ] × 10 V

where

V_out is the maximum output voltage level

R_L is the load impedance in ohms

R_O is the output impedance on the NI 5401

By default, R_O = 50 Ω, but you can use the software to set it to 75 Ω.

Note  Software sets the voltage output levels based on a 50 Ω load termination.