NI-9208 Getting Started

Connector Types

The NI-9208 has more than one connector type: NI-9208 with spring terminal and NI-9208 with DSUB. Unless the connector type is specified, NI-9208 refers to all connector types.

NI-9208 Block Diagram


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The input signals are scanned, amplified, conditioned, and then sampled by a single 24-bit ADC. The module provides overvoltage protection for each channel. Only one channel can be in an overvoltage condition at a time.

NI-9208 with Spring Terminal Pinout


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Table 1. Signal Descriptions
Signal Description
AI Analog input signal connection
COM Common reference connection to isolated ground
Vsup Voltage supply connection

NI-9208 with DSUB Terminal Pinout


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Table 2. Signal Descriptions
Signal Description
AI Analog input signal connection
COM Common reference connection to isolated ground
Vsup Voltage supply connection

Connecting an External Power Supply

You can connect an external power supply to the NI-9208. This power supply provides the current for the devices you connect to the module. Connect the positive lead of the power supply to a Vsup pin and the negative lead of the power supply to COM. Install a 2 A maximum, fast-acting fuse between the external power supply and the Vsup pin.

Note The Vsup pins are internally connected to each other. You can connect only one external voltage supply to the device.
Caution Do not remove or insert modules if the external power supply connected to the Vsup and COM pins is powered on.

Connecting a Loop-Powered Current Transducer


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Connecting a Three-Wire Current Transducer


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NI-9208 Connection Guidelines

  • Make sure that devices you connect to the NI-9208 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-9208 with spring terminal.
  • When using a solid wire or a stranded wire with a ferrule with the NI-9208 with spring terminal, push the wire into the terminal.
  • When using stranded wire without a ferrule with the NI-9208 with spring terminal, open the terminal by pressing the push button.

High-Vibration Application Connections

If your application is subject to high vibration, NI recommends that you use the NI-9940 backshell kit to protect connections to the NI-9208 with spring terminal.

Conformal Coating

The NI-9208 is available with conformal coating for additional protection in corrosive and condensing environments, including environments with molds and dust.

In addition to the environmental specifications listed in the NI-9208 Safety, Environmental, and Regulatory Information, the NI-9208 with conformal coating meets the following specification for the device temperature range. To meet this specification, you must follow the appropriate setup requirements for condensing environments. Refer to Conformal Coating and NI RIO Products for more information about conformal coating and the setup requirements for condensing environments.

Operating humidity (IEC 60068-2-30 Test Db) 80 to 100% RH, condensing