Documentation

This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English verison of the page.

Note: This page has been translated by MathWorks. Please click here
To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.

ExcitationCurrent

Voltage of external source of excitation

Description

When working with the session-based interface, the ExcitationCurrent property indicates the current in amps that you use to excite an IEPE accelerometer, IEPE microphone, generic IEPE sensors, and RTDs.

The default ExcitationCurrent is typically determined by the device. If the device supports a range of excitation currents, the default will be the lowest available value in the range.

Example

Change Excitation Current Value

Change the excitation current value of a microphone channel.

Create a session and add an analog input microphone channel.

s = daq.createSession('ni');
ch = addAnalogInputChannel(s,'cDAQ1Mod3', 0, 'Microphone')
ch = 

Data acquisition analog input microphone channel 'ai0' on device 'cDAQ1Mod3':

          Sensitivity: 'Unknown'
MaxSoundPressureLevel: 'Unknown'
    ExcitationCurrent: 0.002
     ExcitationSource: Internal
             Coupling: AC
       TerminalConfig: PseudoDifferential
                Range: -5.0 to +5.0 Volts
                 Name: ''
                   ID: 'ai0'
               Device: [1x1 daq.ni.CompactDAQModule]
      MeasurementType: 'Microphone'
        ADCTimingMode: ''

Change the excitation current value to 0.0040.

ch.ExcitationCurrent = .0040
ch = 

Data acquisition analog input microphone channel 'ai0' on device 'cDAQ1Mod3':

          Sensitivity: 'Unknown'
MaxSoundPressureLevel: 'Unknown'
    ExcitationCurrent: 0.004
     ExcitationSource: Internal
             Coupling: AC
       TerminalConfig: PseudoDifferential
                Range: -5.0 to +5.0 Volts
                 Name: ''
                   ID: 'ai0'
               Device: [1x1 daq.ni.CompactDAQModule]
      MeasurementType: 'Microphone'
        ADCTimingMode: ''

See Also

Was this topic helpful?