ADLINK PXI-9527 - Manual (Page 30)

20 Getting Started
2.5.3 Analog Output Connection
If the DUT inputs are ground-referenced, differential output mode
can eliminate measurement errors caused by ground loops.
If the DUT inputs are in a floating system, such as a floating ear-
phone, pseudo-differential output mode provides a reference
ground connected to the positive output of the BNC through a
50 Ω resistor.
DUT Input Reference Type AO Channel Configuration
Floating Pseudo
differential
Ground-Reference Differential
Table 2-2: Analog Output Connection