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: ''