Data Acquisition Toolbox
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InputType

InputType specifies the analog input hardware channel configuration. For sound cards, InputType can only be AC-Coupled. For National Instruments devices, InputType can be SingleEnded, Differential, or NonReferencedSingleEnded.

Depending on the hardware you are using, changing the InputType property value may change the number of channels available for the analog input object. Furthermore, if the InputType value is changed while the analog input object is running, then all channels are deleted and a warning is issued if the number of available channels is reduced.

Note:
You should use the differential mode whenever possible since this mode helps to reduce noise.

Characteristics

Device Objects

 AI
Class

Common
Access

 Read/write
Data Type

 Enumerated list
Modify while Running

 No

Values

Sound Card Values

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

National Instruments Values

SingleEnded
 Channels are configured as single-ended
{Differential}
 Channels are configured as differential
NonReferencedSingleEnded
 This channel configuration is used when the input signal has its own ground reference. The input signal's ground reference is connected to AISENSE, which is tied to the negative input of the
instrumentation amplifier.


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