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Chapter 4 Signal Connections
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National Instruments Corporation 4-11 PCI-6023E/6024E/6025E User Manual
gain setting of the amplifier. The amplifier output voltage is referenced to
the ground for the board. Your board’s A/D converter (ADC) measures this
output voltage when it performs A/D conversions.
You must reference all signals to ground either at the source device or at
the board. If you have a floating source, you should reference the signal
to ground by using the RSE input mode or the DIFF input configuration
with bias resistors (see the Differential Connections for Nonreferenced or
Floating Signal Sources section in this chapter). If you have a grounded
source, you should not reference the signal to AIGND. You can avoid this
reference by using DIFF or NRSE input configurations.
Analog Input Signal Connections
The following sections discuss the use of single-ended and differential
measurements and recommendations for measuring both floating and
ground-referenced signal sources.
Figure 4-4 summarizes the recommended input configuration for both
types of signal sources.
PCI.book Page 11 Wednesday, September 16, 1998 9:09 AM