National Instruments NI-9208 User manual

NI-9208
Getting Started
2023-04-25

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

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
R
Vsup
Vsup
AI0
COM
COM
AI15
R
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
© National Instruments 3
NI-9208 Getting Started

COM
AI14
AI12
AI10
AI8
AI6
AI4
AI2
AI0
COM
AI15
AI13
AI11
AI9
AI7
AI5
AI3
AI1
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
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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
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
COM
COM
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
Vsup
AI0
AI1
AI2
AI3
AI4
AI5
AI6
AI7
COM
COM
AI8
AI9
AI10
AI11
AI12
AI13
AI14
AI15
Vsup
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
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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
© National Instruments 5
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
© 2023 National Instruments Corporation.