NI-9215 Getting Started

In this document, the NI-9215 with screw terminal, the NI-9215 with spring terminal, and the NI-9215 with BNC are referred to inclusively as the NI-9215. The information in this document applies to all versions of the NI-9215 unless otherwise specified.

NI-9215 Block Diagram


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  • Input signals on each channel are buffered, conditioned, and then sampled by an ADC.
  • Each AI channel provides an independent track-and-hold amplifier, enabling you to sample all channels simultaneously.

NI-9215 Pinout


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Table 1. Signal Descriptions
Signal Description
AI+ Positive analog input signal connection
AI- Negative analog input signal connection
COM Common reference connection to isolated ground
NC No connection

NI-9215 Grounded Differential Connections


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Floating Differential Connections


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  • Connect the negative lead to COM through a 1 MΩ resistor to keep the signal source within the common-mode voltage range.
  • The NI-9215 with screw terminal and the NI-9215 with spring terminal does not read data accurately if the signal source is outside of the common-mode voltage range.

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The NI-9215 with BNC has internal circuitry that maintains the common mode voltage range.

Single-Ended Connections


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Connect the ground signal to COM to keep the signal source within the common-mode voltage range.


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The NI-9215 with BNC has internal circuitry that maintains the common mode voltage range.

Connection Guidelines

  • Make sure that devices you connect to the NI-9215 are compatible with the module specifications.
  • You must use 2-wire ferrules to create a secure connection when connecting more than one wire to a single terminal on the NI-9215 with screw terminal or NI-9215 with spring terminal.

High-Vibration Application Connections

If your application is subject to high vibration, NI recommends that you follow these guidelines to protect connections to the NI-9215 with screw terminal or the NI-9215 with spring terminal:
  • Use ferrules to terminate wires to the detachable connector.
  • Use the NI-9927 backshell kit with the NI-9215 with screw terminal or the NI-9981 backshell kit with the NI-9215 with spring terminal.