National Instruments NI-9206 User manual

NI-9206
Getting Started
2023-08-02

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

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
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
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
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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
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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
V1
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
V1
V2
–
–
+
+
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.
© National Instruments 5
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
V1
V2
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
V1
V2
COM
AI1
AISENSE
AI0
+
+
–
–
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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
© National Instruments 7
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.
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NI-9206 Getting Started
© 2023 National Instruments Corporation.