Table Of Contents

Measurement System Types and Signal Sources

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    Last Modified: February 16, 2016

    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.

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