Measurement System Types and Signal Sources

NI-DAQmx 18.6 Help


Edition Date: January 2019
Part Number: 370466AH-01
View Product Info

DOWNLOAD (Windows Only)


NI-DAQmx 18.6 Help
NI-DAQmx 19.0 Help
NI-DAQmx 19.1 Help
NI-DAQmx 19.5 Help

The type of input signal source (grounded or floating) and the configuration of the measurement system (differential, single-ended, pseudodifferential) determine how you connect signals to measurement devices.

The following table provides an application-independent summary of analog input connections.

Input Signal Source Type
Floating Signal Source (Not Connected to Building Ground) Grounded Signal Source
Examples: Ungrounded thermocouples, signal conditioning with isolated outputs, battery devices Example: Instruments with nonisolated outputs
Differential (DIFF)
Ground Referenced Single-Ended (RSE)


Note: AI GND is shared as a reference for all RSE channels

Nonreferenced Single-Ended (NRSE)


Note: AI SENSE is shared as a reference for all NRSE channels

Pseudodifferential
R ext is the external bias resistor that you add.

WAS THIS ARTICLE HELPFUL?

Not Helpful