National Instruments NI 9213 Manuel utilisateur

NI-9213

Getting Started

2023-08-02

Contents

NI-9213 Getting Started. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

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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.

Dierences between the two types of spring terminal connectors are noted by the

connector color.

NI-9213 Block Diagram

Each channel passes through a dierential 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

NI-9213 (Black Connector) Pinout

NI-9213 Getting Started

TC0+

TC2+

TC4+

TC6+

TC8+

TC10+

TC12+

TC14+

COM

TC1+

TC3+

TC5+

TC7+

TC9+

TC11+

TC13+

TC15+

TC0–

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

TC0+

TC2+

TC4+

TC6+

TC8+

TC10+

TC12+

TC14+

COM

TC1+

TC3+

TC5+

TC7+

TC9+

TC11+

TC13+

TC15+

TC0–

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

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 soware 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 oset errors resulting from the source impedance of

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 aer 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 oset 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 dierent temperature than the cold-junction compensation sensor. Thermal

gradient across the terminals can cause the terminals of dierent NI-9213 channels

to be at dierent temperatures, which creates accuracy errors and aects 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 oset 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 soware 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.

NI-9213 Getting Started

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