National Instruments 9213E Manual de usuario

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9213E

16-Channel Thermocouple Input Module

NI 9213E Operating Instructions and Specifications 2 ni.com

This document describes how to use the National Instruments 9213E

and includes dimensions, terminal assignments, and specifications for

the NI 9213E. Visit ni.com/info and enter rdsoftwareversion

to determine which software you need for the modules you are using.

For information about installing, configuring, and programming the

system, refer to the system documentation. Visit ni.com/info and

enter cseriesdoc for information about C Series documentation.

Caution National Instruments makes no electromagnetic

compatibility (EMC) or CE marking compliance claims

for the NI 9213E. The end-product supplier is responsible

for conformity to any and all compliance requirements.

Caution The NI 9213E must be installed inside a suitable

enclosure prior to use. Hazardous voltages may be present.

NI 9213E Dimensions

The following figure shows the dimensions of the NI 9213E.

Figure 1. NI 9213E Dimensions in Millimeters (Inches)

73.4 (2.89)

0.0 (0.00)

26.7 (1.05)

58.4 (2.30)

66.0 (2.60)

0.0 (0.00)

NI 9213E Operating Instructions and Specifications 4 ni.com

Connecting the NI 9213E

The NI 9213E has a 36-terminal detachable spring-terminal

connector that provides connections for 16 thermocouple channels.

Figure 2. NI 9213E Terminal Assignments

TC0+

TC1+

TC2+

TC3+

TC4+

TC5+

TC6+

TC7+

TC8+

TC9+

TC10+

TC11+

TC12+

TC13+

TC14+

TC15+

COM

TC0–

TC1–

TC2–

TC3–

TC4–

TC5–

TC6–

TC7–

TC8–

TC9–

TC10–

TC11–

TC12–

TC13–

TC14–

TC15–

COM

You can connect thermocouple input signals to the NI 9213E.

Connect the positive lead of the thermocouple to the TC+ terminal

and the negative lead of the thermocouple to the TC– terminal. If

you are unsure which of the thermocouple leads is positive and

which is negative, check the thermocouple documentation or the

thermocouple wire spool.

The NI 9213E also has two common terminals, COM, that are

internally connected to the isolated ground reference of the

module. If you are using a shielded thermocouple, connect COM

to the shield and the shield to a common-mode voltage reference of

the thermocouple. A common-mode voltage reference is a voltage

that is within ±1.2 V of the common-mode voltage of the

thermocouple. If you are using a floating thermocouple or a

thermocouple within ±1.2 V of earth ground, connect COM and the

shield to earth ground. The shield grounding methodology can vary

depending on the application. Refer to Figure 3 for an illustration

of a typical shielding configuration.

NI 9213E Operating Instructions and Specifications 6 ni.com

Figure 3. Connecting a Shielded Thermocouple Input Signal to the NI 9213E

Thermocouple

TC–

COM

TC+

Shield

NI 9213E

Vreference

Connecting Wires to the NI 9213E Connector

Use a flathead screwdriver with a blade smaller than 2.3 × 1.0 mm

(0.09 × 0.04 in.) to connect wires to the detachable spring-terminal

connector. Insert the screwdriver into a spring clamp activation slot

and press a wire into the corresponding connector terminal, then

remove the screwdriver to clamp the wire into the terminal. Refer

to the Specifications section for more information about

spring-terminal wiring. Refer to Figure 4 for an illustration of

connecting wires to the NI 9213E.

Figure 4. Connecting Wires to the NI 9213E Connector

NI 9213E Operating Instructions and Specifications 8 ni.com

NI 9213E Circuitry

Each channel of the NI 9213E passes through a differential filter

and then is multiplexed and sampled by a 24-bit analog-to-digital

converter (ADC). Each channel also 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. Refer to Figure 5 for an illustration of

the input circuitry for one channel of the NI 9213E.

The NI 9213E multiplexes 16 thermocouple input channels,

1 cold-junction compensation (CJC) channel, and 1 autozero

channel to a single ADC. Each channel has a resistor that produces

an input impedance between the TC+and COM terminals and

between the TC– and COM terminals. The gain and offset errors

resulting from the source impedance of connected thermocouples

are negligible for most applications. Thermocouples with a higher

lead resistance can introduce more significant errors. Refer to the

Specifications section for more information about errors resulting

from source impedance.

Figure 5. Input Circuitry for One Channel of the NI 9213E

The channels share a common ground, COM, that is isolated from

other modules in the system. The NI 9213E 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 9213E

measures the common-mode voltage level of each channel and

returns a warning in the software if the signal is outside the

TC+

TC–

COM

NI 9213E

Input

Impedance

Open

Thermocouple

Detection

Current

Filtered

Differential

Amplifier

and

Multiplexer

Isolated

ADC

39 MΩ

NI 9213E Operating Instructions and Specifications 10 ni.com

common-mode voltage range. Refer to the Specifications section

for more information about the common-mode voltage range.

The NI 9213E 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. Refer to the

Specifications section for more information about the

high-resolution and high-speed timing modes. Refer to the

software help for information about setting the timing mode, or

conversion time, in software. Visit ni.com/info and enter

cseriesdoc for information about C Series documentation.

Temperature Measurement Accuracy

Considerations

Temperature measurement errors depend partly on the

thermocouple type, the accuracy of the thermocouple, the

temperature being measured, and the cold-junction temperature.

Refer to the Temperature Measurement Accuracy section in the

Specifications for the errors for each thermocouple type when

connected to the NI 9213E. The errors do not account for the

accuracy of the thermocouple itself.

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