User guide

22 Operations
3.2 Analog Input Channel
3.2.1 Analog Input Front-End Configuration
Figure 3-1: Analog Input Architecture of the PXI-9527
Differential and Pseudo-Differential Input Configuration
The PXC-9527 provides both differential and psuedo-differen-
tial input configurations. The differential input mode provides
voltage to the anode and cathode inputs of the BNC connector
according to signal voltage difference between them. If the sig-
nal source is ground-referenced, the differential input mode
can be used for common-mode noise rejection.
If the signal source is a floating signal, pseudo-differential input
mode will provide a reference ground connected to the cathode
input of the BNC through a 50 Ω resistor. This will prevent the
floating source from drifting over the input common-mode
range.
The recommended configurations for the signal sources are as
follows..
Signal Source Type Card Configuration
Floating Pseudo differential
Ground-Reference Differential
Table 3-1: Input Configurations