PCI-1720 & 1720U User Manual
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Chapter 5 Signal Connections
5.1 Overview
Making correct signal corrections is important for accurate data transmis-
sions. Since most data acquisition applications involve some form of
voltage measurement, making a sound signal connection will also protect
your equipment against possible damage. This chapter shows you how to
make proper signal connections.
5.2 D/A Voltage Output Connections
PCI-1720 cards support four channels of D/A voltage output. Only one
output signal wire is used with each channel. The voltage output is refer-
enced to a common ground (AGND).
There are three types of voltage output connections:
1. Floating
load.
2. Grounded
load.
3. Differential
load with ground.
They are shown in the following illustrations.
Figure 5.1: Floating-load Connection for D/A Voltage Output
D/A
Internal Side
V
OUT
AGND
External Side
Floating
Load
