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InputType

Specify analog input hardware channel configuration

Description

For National Instruments® devices, InputType can be SingleEnded, Differential, NonReferencedSingleEnded, or PseudoDifferential. For Measurement Computing™ devices, InputType can be SingleEnded, or Differential. For sound cards, InputType can only be AC-Coupled.

If channels have been added to a National Instruments or Measurement Computing analog input object and you change the InputType value, then the channels are automatically deleted if the hardware reduces the number of available channels.

Characteristics

Usage

AI, common to all channels

Access

Read/write

Data type

String

Read-only when running

Yes

Values

Advantech and Measurement Computing

Differential

Channels are configured for differential input.

SingleEnded

Channels are configured for single-ended input.

The value for InputType on Advantech® and MCC boards is always read-only in MATLAB®. For Advantech boards, the setting is made in the Advantech Device Manager. For Measurement Computing boards, the setting is made in InstaCal.

National Instruments

{Differential}

Channels are configured for differential input.

SingleEnded

Channels are configured for single-ended input.

NonReferencedSingleEnded

This channel configuration is used when the input signal has its own ground reference, which is tied to the negative input of the instrumentation amplifier.

PseudoDifferential

Channels are configured for pseudodifferential input, which are all referred to a common ground but this ground is not connected to the computer ground.

Sound Cards

{AC-Coupled}

The input is coupled so that constant (DC) signal levels are suppressed.

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