National Instruments NI 9213 Manuale utente
NI-9213
Getting Started
2023-08-02
NI-9213 Getting Started
Connector Types
The NI-9213 is available in two types: push-in spring terminal and spring terminal.
The push-in type spring terminal connector is black and orange. The spring terminal
connector is black. NI-9213 refers to both types unless the two types are specified.
Dierences between the two types of spring terminal connectors are noted by the
connector color.
NI-9213 Block Diagram
Each channel passes through a dierential filter and then is multiplexed and
sampled by a 24-bit analog-to-digital converter (ADC). The channels share a
common ground, COM, that is isolated from other modules in the system.
Figure 1. Input Circuitry for One Channel of the NI-9213
TC+
TC–
COM
NI 9213
Input
Impedance
Open
Thermocouple
Detection
Current
Filtered
Differential
Amplifier
and
Multiplexer
Isolated
ADC
39 MΩ
39 MΩ
NI-9213 (Black Connector) Pinout
© National Instruments 3
NI-9213 Getting Started
NC
TC0+
TC2+
TC4+
TC6+
TC8+
TC10+
TC12+
TC14+
COM
TC1+
TC3+
TC5+
TC7+
TC9+
TC11+
TC13+
TC15+
TC0–
NC
TC1–
TC3–
TC5–
TC7–
TC9–
TC11–
TC13–
TC15–
TC2–
TC4–
TC6–
TC8–
TC10–
TC12–
TC14–
COM
Table 1. Signal Descriptions
Signal Description
COM Common reference connection
NC No connection
TC+ Positive thermocouple connection
TC- Negative thermocouple connection
NI-9213 (Black/Orange Connector) Pinout
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
NC
TC0+
TC2+
TC4+
TC6+
TC8+
TC10+
TC12+
TC14+
COM
TC1+
TC3+
TC5+
TC7+
TC9+
TC11+
TC13+
TC15+
TC0–
NC
TC1–
TC3–
TC5–
TC7–
TC9–
TC11–
TC13–
TC15–
TC2–
TC4–
TC6–
TC8–
TC10–
TC12–
TC14–
COM
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NI-9213 Getting Started
Table 2. Signal Descriptions
Signal Description
COM Common reference connection
NC No connection
TC+ Positive thermocouple connection
TC- Negative thermocouple connection
Connecting Wires to the NI-9213 (Black Connector)
What to Use
■ NI-9213 spring-terminal connector
■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-9213
What to Do
Complete the following steps to connect wires to the spring-terminal connector.
123
© National Instruments 5
NI-9213 Getting Started
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.
Connecting Wires to the NI-9213 with Push-in Style
Spring Terminal (Black/Orange Connector)
What to Use
■NI-9213 (black/orange connector)
■0.14 mm to 1.5 mm (26 AWG to 16 AWG) copper conductor wire with
10 mm (0.394 in.) of insulation stripped from the end
■Ferules (optional)
What to Do
Refer to the following table for how to insert a wire into a terminal depending on
what type of wire you are using or if you are using a ferrule.
Option Description
When using a solid wire or stranded wire with a
ferrule
Push the wire into the terminal when using a
solid wire or stranded wire with a ferrule
When using a stranded wire without a ferrule Press the push button and then push the wire
into the terminal
Note You must use 2-wire ferrules to create a secure connection when
connecting more than one wire to a single terminal.
Connecting a Thermocouple
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NI-9213 Getting Started
Thermocouple
TC–
COM
TC+
Shield
NI 9213
Vreference
Connect the shield to a common-mode voltage reference on the thermocouple.
A valid common-mode voltage reference is a voltage that is within ±1.2 V of the
common-mode voltage of all the connected thermocouples
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-9213.
Common-Mode Voltage
The NI-9213 common-mode range is the maximum voltage between any channel
and COM. If COM is not connected, then the common-mode voltage range is the
maximum voltage between any two channels. The NI-9213 measures the common-
mode voltage level of each channel and returns a warning in the soware if the
signal is outside the common-mode voltage range.
Open Thermocouple Detection
Each channel has an open thermocouple detection (OTD) circuit, which consists of
a current source between the TC+ and TC- terminals. If an open thermocouple is
connected to the channel, the current source forces a full-scale voltage across the
terminals.
Input Impedance
Each channel has a resistor that produces an input impedance between the TC and
COM terminals. The gain and oset errors resulting from the source impedance of
© National Instruments 7
NI-9213 Getting Started
connected thermocouples are negligible for most applications. Thermocouples with
a higher lead resistance can introduce more significant errors.
Minimizing Thermal Gradients
Changes in the ambient air temperature near the front connector or a thermocouple
wire conducting heat directly to terminal junctions can cause thermal gradients.
Observe the following guidelines to minimize thermal gradients and improve the
system accuracy.
■Use small-gauge thermocouple wire. Smaller wire transfers less heat to or
from the terminal junction.
■Avoid running thermocouple wires near hot or cold objects.
■Minimize adjacent heat sources and air flow across the terminals.
■Keep the ambient temperature as stable as possible.
■Make sure the NI-9213 terminals are facing forward or upward.
■Keep the NI-9213 in a stable and consistent orientation.
■Allow the thermal gradients to settle aer a change in system power or
in ambient temperature. A change in system power can happen when the
system powers on, the system comes out of sleep mode, or you insert/remove
modules.
■Run thermocouple wiring together near the spring-terminal connector to
keep the wires at the same temperature.
■If you connect any extension wires to thermocouple wires, use wires made
of the same conductive material as the thermocouple wires.
■Use the NI-9440 backshell kit.
Thermocouple Measurement Accuracy
Thermocouple measurement errors depend partly on the following factors.
■Type of thermocouple
■Accuracy of the thermocouple
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NI-9213 Getting Started
■Temperature that you are measuring
■Resistance of the thermocouple wires
■Cold-junction temperature
Note Use the autozero channel to compensate for oset errors.
Cold-Junction Accuracy
Heat dissipated by adjacent C Series modules or nearby heat sources can
cause errors in thermocouple measurements by heating the NI-9213 terminals
to a dierent temperature than the cold-junction compensation sensor. Thermal
gradient across the terminals can cause the terminals of dierent NI-9213 channels
to be at dierent temperatures, which creates accuracy errors and aects the
relative accuracy between channels.
The temperature measurement accuracy specifications include errors caused by the
thermal gradient across the NI-9213 terminals for configurations with the NI-9213
terminals facing forward or upward.
Autozero Channel
The NI-9213 has an internal autozero channel, which can be subtracted from each
thermocouple reading to compensate for oset errors. Use of the autozero channel
is optional, however the NI-9213 specifications assume that autozero is applied to
every sample. Refer to the documentation for the soware that you are using with
the NI-9213 for information about using the autozero channel.
Timing Modes
The NI-9213 supports high-resolution and high-speed timing modes. High-
resolution timing mode optimizes accuracy and noise and rejects power line
frequencies. High-speed timing mode optimizes sample rate and signal bandwidth.
© National Instruments 9
NI-9213 Getting Started
© 2023 National Instruments Corporation.
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