ExcitationCurrent

Current 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: ''