DAQ Device Configuration Page

NI VeriStand 2018 Help

Edition Date: May 2018

Part Number: 372846M-01

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In the System Explorer window, expand DAQ in the configuration tree and select a DAQ device to display this page. Use this page to configure properties of the DAQ device.

This page includes the following options:

  • Device Specification—Includes the following components you can use to name and describe the device:
    • Device—Specifies the name of the device. The name you specify replaces the name in the configuration tree.
    • Description—Specifies a description for the device.
    • Product name—Displays a list of DAQ devices. Select the device you want to configure or start typing the name of a device model, such as PCIe-6320 or USB-6009, to populate this menu with names that match. Select Not Specified if you do not know the device model or the model is not listed.
  • Device Location—Includes the following component:
    • Chassis—Specifies the chassis that contains the device.
  • Device Settings—Includes the following components:
    • Input configuration—Specifies the input terminal configuration to apply to the device channels. If you configure this setting for a specific channel(s), that value overrides the value you specify for the device in this menu.
      • Default—Uses the default terminal configuration for the device.
      • RSE—Specifies that the analog input channels are reference single-ended (RSE). A referenced single-ended (RSE) measurement system measures voltage with respect to the ground, which is directly connected to the measurement system ground. Refer to the Measurement Fundamentals help file that is installed with NI-DAQ for more information about RSE signals.
      • NRSE—Specifies that the analog input channels are non-referenced single-ended (NRSE). In a NRSE measurements system, all measurements are still made with respect to a single-node analog input, AISENSE, but the potential at this node can vary with respect to the measurement system ground. Refer to the Measurement Fundamentals help file that is installed with NI-DAQ for more information about NRSE signals.
      • Differential—Specifies that the analog input channels are differential. A differential measurement system has neither of its inputs tied to a fixed reference, such as earth or building ground. A differential measurement system is similar to a floating signal source in that the measurement is made with respect to a floating ground that is different from the measurement system ground. Hand-held, battery-powered instruments and DAQ devices with instrumentation amplifiers are examples of differential measurement systems. This mode measures potential between two inputs and therefore reduces channel count by 2. Refer to the Measurement Fundamentals help file that is installed with NI-DAQ for more information about differential signals.
      • Pseudodifferential—Specifies that the analog input channels are pseudodifferential. A pseudodifferential measurement system combines some characteristics of a differential input channel and a referenced single-ended (RSE) input channel. Like a differential input channel, a pseudodifferential measurement system exposes both the positive and negative sides of the channel. You connect the positive and negative inputs to the respective outputs of the unit under test. The negative input is tied to system ground through a relatively small impedance. The impedance between the negative input and ground may include both resistive and capacitive components. The positive and negative sides of the input channel are separated by a larger impedance. Refer to the Measurement Fundamentals help file that is installed with NI-DAQ for more information about pseudodifferential signals.
    • PXI Backplane Reference Clock—If the DAQ device is part of a PXI/PXIe chassis, specifies a reference clock on the chassis backplane to which the device synchronizes its timing. If the device or its chassis do not support reference clock synchronization, select None or Automatic. Otherwise, NI VeriStand returns error code -307750.
      • None—Specifies to not synchronize timing to a reference clock.
      • Automatic—Automatically selects a reference clock using the following logic. If the supported reference clock for your device is different from the logic for this option, select the appropriate 10 or 100 MHz clock in this menu.
        • If chassis type is PXI, use PXI_Clk10, a 10 MHz clock on the chassis backplane.
        • If chassis type is PXIe:
          • X Series, SC Express, and NI-TIO devices—Use PXIe_Clk100, a 100 MHz clock on the chassis backplane.
          • All other devices—Use PXI_Clk10.
      • 10 MHz—Specifies to use PXI_Clk10, a 10 MHz clock on the chassis backplane.
      • 100 MHz—Specifies to use PXIe_Clk100, a 100 MHz clock on the chassis backplane.

      During reference clock synchronization, devices synchronize their onboard oscillators to the Reference Clock.

    • Conversion rate—Specifies the rate of the Convert Clock for the device. The Convert Clock directly causes ADC conversions on a multiplexed device:
      • Default—Uses the default Convert Clock rate for the device.
      • Maximum—Uses the maximum possible Convert Clock rate based on the task configuration.
    • Hardware-timed Single-Point Sample Mode—Contains options that determine whether to allow hardware-timed single-point sampling for analog measurements. In this mode, samples are acquired or generated continuously using hardware timing and no buffer.
      • Disable AI support—Disables hardware-timed single-point support for analog input channels.

        This option is available only if the AI channels on the device are configured to perform single-point acquisitions. If the AI channels on the device are configured to perform waveform acquisitions, NI VeriStand automatically disables hardware-timed single-point support.
      • Disable AO support—Disables hardware-timed single-point support for analog output channels.

Related Information

Refer to the following topics in the Measurement Fundamentals help file that is installed with NI-DAQmx for more information about concepts mentioned in this topic.

  • Hardware-Timed Single Point Sample Mode
  • Referenced and Nonreferenced Single-Ended Measurement Systems
  • Pseudodifferential Measurement System

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