National Instruments NI-9208 Manuale utente

NI-9208

Getting Started

2023-04-25

Contents

NI-9208 Getting Started. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

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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

NI 9208

Vsup

AI0

COM

AI15

Amp Isolated

ADC

MUX

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

NI-9208 Getting Started

COM

AI14

AI12

AI10

AI8

AI6

AI4

AI2

AI0

COM

AI15

AI13

AI11

AI9

AI7

AI5

AI3

AI1

Vsup

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

Vsup

COM

Vsup

AI0

AI1

AI2

AI3

AI4

AI5

AI6

AI7

COM

AI8

AI9

AI10

AI11

AI12

AI13

AI14

AI15

Vsup

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NI-9208 Getting Started

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

NI 9208

–

AI0

External

Power

Supply

Loop-Powered

Current

Transducer

Vsup

COM

Vsup

2 A

Max

NI-9208 Getting Started

Connecting a Three-Wire Current Transducer

NI 9208

Vsup

COM

–

COM

Vsup

AI0

External

Power

Supply

Three-Wire

Current

Transducer

2 A

Max

OUT

–

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.

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NI-9208 Getting Started

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