Chapter 3 Hardware Overview
National Instruments Corporation
3-3
DAQCard E Series User Manual
single-ended channels. Table 3-1 describes the three input
configurations.
For more information about the three types of input configuration, refer
to the
Analog Input Signal Connections
section in Chapter 4,
Signal
Connections
, which contains diagrams showing the signal paths for the
three configurations.
Input Polarity and Input Range
♦
DAQCard-AI-16E-4
This DAQCard has two input polarities—unipolar and bipolar.
Unipolar input means that the input voltage range is between 0 and
V
ref
, where V
ref
is a positive reference voltage. Bipolar input means
that the input voltage range is between -V
ref
/2
and +V
ref
/2. The
DAQCard-AI-16E-4 has a unipolar input range of 10 V (0 to 10 V)
and a bipolar input range of 10 V (
±
5 V). You can program polarity
and range settings on a per channel basis so that you can configure
each input channel uniquely.
Table 3-1.
Available Input Configurations for the DAQCard E Series
Configuration
Description
DIFF
A channel configured in DIFF mode uses two analog
channel input lines. One line connects to the positive
input of the DAQCard programmable gain
instrumentation amplifier (PGIA), and the other
connects to the negative input of the PGIA.
RSE
A channel configured in RSE mode uses one analog
channel input line, which connects to the positive
input of the PGIA. The negative input of the PGIA is
internally tied to analog input ground (AIGND).
NRSE
A channel configured in NRSE mode uses one
analog channel input line, which connects to the
positive input of the PGIA. The negative input of the
PGIA connects to the analog input sense (AISENSE)
input.
