Table Of Contents

Internal Channels for X Series Simultaneous Sampling Devices

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    Last Modified: November 16, 2017

    On an X Series device, you can either acquire a signal present on the I/O connector, or you can acquire a signal that is being generated from the internal calibration multiplexer. The channels available on this multiplexer are typically used for calibration purposes, but you can also sample them as you would a physical signal present on the I/O connector. To read from one of these internal channels on a X Series simultaneous sampling device, you must use one of the device's AI physical channels (for example, Dev1/ai0) when creating the virtual channel. The physical channel specifies the ADC for the internal channel. You can then set the appropriate string value on the Input Source channel attribute/property.

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    Note  

    All X Series simultaneous sampling devices must have the same Input Source setting on all channels.

    Internal Channel Name Description
    _external_channel The differential terminal on the I/O connector that is typically used for acquiring data.
    _aignd_vs_aignd A single-ended terminal with the positive and negative terminals both connected to the ground reference for analog input.
    _ao0_vs_aognd A differential terminal with the positive terminal connected to physical channel ao0 and the negative terminal connected to the ground reference for analog output.
    _ao0_vs_calSrcHi A differential terminal with the positive terminal connected to physical channel ao0 and the negative terminal connected to the calibration PWM.
    _ao1_vs_aognd A differential terminal with the positive terminal connected to physical channel ao1 and the negative terminal connected to the ground reference for analog output.
    _ao1_vs_calSrcHi A differential terminal with the positive terminal connected to physical channel ao1 and the negative terminal connected to the calibration PWM.
    _ao2_vs_aognd A differential terminal with the positive terminal connected to physical channel ao2 and the negative terminal connected to the ground reference for analog output.
    _ao3_vs_aognd A differential terminal with the positive terminal connected to physical channel ao3 and the negative terminal connected to the ground reference for analog output.
    _calref_vs_aignd A single-ended terminal with the positive terminal connected to the internal calibration reference voltage and the negative terminal connected to the ground reference for analog input.
    _calSrcHi_vs_aignd A single-ended terminal with the positive terminal connected to the calibration PWM and the negative terminal connected to the ground reference for analog input.
    _calref_vs_calSrcHi A differential terminal with the positive terminal connected to the internal calibration reference voltage and the negative terminal connected to the calibration PWM.
    _aignd_vs_calSrcHi A differential terminal with the positive terminal connected to the ground reference for analog input and the negative terminal connected to the calibration PWM.
    _calSrcMid_vs_aignd A single-ended terminal with the positive terminal connected to the calibration PWM and the negative terminal connected to the ground reference for analog input. _calSrcMid is the divided down version of _calSrcHi.
    _calSrcHi_vs_ai0 A differential terminal with the positive terminal connected to the calibration PWM and the negative terminal connected to physical channel ai0.
    _calSrcHi_vs_ai8 A differential terminal with the positive terminal connected to the calibration PWM and the negative terminal connected to physical channel ai8.

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