National Instruments NI-9206 User manual

NI-9206

Getting Started

2023-08-02

Contents

NI-9206 Getting Started. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

ni.com

NI-9206 Getting Started

NI-9206 Block Diagram

The NI-9206 channels share a common ground (COM) that is isolated from other

modules in the system. All channels share a programmable gain instrumentation

amplifier and are multiplexed to an ADC. Each channel also has ±30 V overvoltage

protection.

Figure 1. Input Circuitry for One Analog Input Channel on the NI-9206

AI+

AI–

COM

AISENSE

NI-9206

Trigger Trig

Filtered

Differential

Amplifier

16-bit

Isolated

ADC

MUX PGIA

NI-9206 Pinout

AI0

AI1

AI3

AI5

AI7

AI17

AI19

AI21

AI23

DO0

AI2

AI4

AI6

AI16

AI18

AI20

AI22

COM

AI9

AI8

AI10

AI12

AI14

AI24

AI26

AI28

AI30

AISENSE

AI11

AI13

AI15

AI25

AI27

AI29

AI31

PFI0

NI-9206 Getting Started

Table 1. Signal Descriptions

Signal Description

AI Analog input signal connection

AISENSE Reference connection for NRSE measurements

COM Common reference connection to isolated

ground

DO Digital output signal connection

PFI Programmable function interface, digital input

signal connection

NI-9206 Signals

You can connect single-ended or dierential signals to the NI-9206; use a dierential

measurement configuration to attain more accurate measurements and less noise.

Specific signal pairs are valid for dierential connections.

The following table shows the signal pairs that are valid for dierential connection

configurations with the NI-9206.

Table 2. NI-9206 Dierential Pairs

Channel AI+ AI-

0 AI0 AI8

1 AI1 AI9

2 AI2 AI10

3 AI3 AI11

4 AI4 AI12

5 AI5 AI13

6 AI6 AI14

7 AI7 AI15

16 AI16 AI24

17 AI17 AI25

18 AI18 AI26

19 AI19 AI27

20 AI20 AI28

ni.com

NI-9206 Getting Started

Channel AI+ AI-

21 AI21 AI29

22 AI22 AI30

23 AI23 AI31

Connecting Floating Di󽗿erential Signals to the NI-9206

Refer to the following figure to connect floating dierential signals to the NI-9206.

Figure 2. Connecting Floating Dierential Signals to the NI-9206

NI-9206

MUX ADC

PGIA

Vcm

AI0 (CH0+)

AI8 (CH0–)

–

AI1 (CH1+)

AI9 (CH1–)

COM

V2+

–

To connect floating dierential signals to the NI-9206, you must connect the

negative signal to COM through a 1 MΩ resistor to keep the voltage within the

maximum working voltage. If the voltage source is outside the maximum working

voltage, the NI-9206 does not read data accurately.

Connecting Grounded Di󽗿erential Signals to the NI-9206

Refer to the following figure to connect grounded dierential signals to the NI-9206.

Figure 3. Connecting Grounded Dierential Signals to the NI-9206

NI-9206

MUX ADC

PGIA

Vcm

AI0 (CH0+)

AI8 (CH0–)

AI1 (CH1+)

AI9 (CH1–)

COM

–

In a dierential configuration, the NI-9206 rejects the common-mode noise voltage

during the measurement of V1. To connect grounded dierential signals to the

NI-9206, you must also connect the signal reference to COM.

NI-9206 Getting Started

Connecting Referenced Single-Ended Voltage Signals to

the NI-9206

Refer to the following figure to connect referenced single-ended (RSE) signals to the

NI-9206.

Figure 4. Connecting RSE Voltage Signals

NI-9206

MUX

PGIA ADC

COM

AI1

AI0

–

In an RSE configuration, the NI-9206 measures each channel with respect to COM. To

connect RSE signals to the NI-9206, you must connect the voltage ground signal to

COM to keep the maximum working voltage in the specified range.

Note If you leave COM unconnected, the signals float outside the working

input range of the NI-9206. This may result in unreliable measurements

because there is no way to ensure that the input signal is within 10 V of

COM.

Connecting Non-Referenced Single-Ended Voltage

Signals to the NI-9206

Refer to the following figure to connect non-referenced single-ended (NRSE) signals

to the NI-9206.

Figure 5. Connecting an RSE Voltage Signal to the NI-9206

NI-9206

MUX

PGIA ADC

COM

AI1

AISENSE

AI0

–

ni.com

NI-9206 Getting Started

In an NRSE configuration, the NI-9206 measures each channel with respect to

AISENSE. An NRSE configuration provides remote sense for the negative input of

the PGIA that is shared by all channels and also provides improved noise rejection

compared to an RSE connection.

Connecting Fuel Cell Devices to the NI-9206

Refer to the following figure to connect a fuel cell device to the NI-9206.

Figure 6. Connecting a Fuel Cell Device to the NI-9206

NI-9206 Connection Guidelines

■ Make sure that devices you connect to the NI-9206 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-9206.

■ Push the wire into the terminal when using a solid wire or a stranded wire

with a ferrule.

■ Open the terminal by pressing the push button when using stranded wire

without a ferrule.

Connecting to a Spring-Terminal Connector

What to Use

■ NI-9206 spring-terminal connector

NI-9206 Getting Started

■ 0.08 mm to 1.0 mm (28 AWG to 18 AWG) copper conductor wire with 7 mm

(0.28 in.) of insulation stripped from the end

■Flathead screwdriver with a 2.3 mm x 1.0 mm (0.09 in. x 0.04 in.) blade,

included with the NI-9206

What to Do

Complete the following steps to connect wires to the spring-terminal connector.

1 2 3

1. Insert the screwdriver into a spring clamp activation slot to open the

corresponding connector terminal.

2. Press a wire into the open connector terminal.

3. Remove the screwdriver from the activation slot to clamp the wire into place.

High-Vibration Application Connections

If your application is subject to high vibration, NI recommends that you use the

cRIO-9941 backshell kit to protect connections to the NI-9206.

ni.com

NI-9206 Getting Started

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