National Instruments 9211A Manuale utente

USER GUIDE AND SPECIFICATIONS

USB-9211/9211A

4-Channel, 24-Bit Thermocouple Input Devices

This user guide describes how to use the National Instruments

USB-9211/9211A devices and lists the specifications.

Introduction

The NI USB-9211/9211A data acquisition device provides a USB interface

for four channels of 24-bit thermocouple inputs with integrated signal

conditioning.

The NI USB-9211 consists of two components: an NI 9211 module and a

USB-9161 carrier, as shown in Figure 1. The NI USB-9211A consists of

two components: an NI 9211 module and a USB-9162 carrier, as shown in

Figure 1.

Figure 1. USB-9211/9211A Components

NI 9211

USB-9161/9162

USB-9211/9211A

USB-9211/9211A User Guide and Specifications 2 ni.com

Dimensions

Figure 2 shows the USB-9211/9211A device dimensions.

Figure 2. USB-9211/9211A Series Devices in Inches (Millimeters)

Safety Guidelines

Operate the USB-9211/9211A only as described in these operating

instructions.

Note Although the NI 9211 module may have more stringent certification standards than

the USB-9211/9211A, when used with the USB-9161/9162 carrier, the combined system

may be limited. Refer to the Specifications section for more details.

Hot Surface This icon denotes that the component may be hot. Touching this component

may result in bodily injury.

Caution Do not disconnect I/O-side wires or connectors unless power has been switched

off or the area is known to be nonhazardous.

Caution Do not remove modules unless power has been switched off or the area is known

to be nonhazardous.

Caution The USB-9211/9211A is not certified for use in hazardous locations.

0.998

(25.34)

Hi-Speed USB Carrier

NI USB-9162

5.521

(140.23)

5.426

(137.82)

4.751

(120.68)

4.656

(118.26)

3.469

(88.12)

©National Instruments Corporation 3 USB-9211/9211A User Guide and Specifications

Safety Guidelines for Hazardous Voltages

If hazardous voltages are connected to the module, take the following

precautions. A hazardous voltage is a voltage greater than 42.4 Vpk or

60 VDC to earth ground.

Caution Ensure that hazardous voltage wiring is performed only by qualified personnel

adhering to local electrical standards.

Caution Do not mix hazardous voltage circuits and human-accessible circuits on the same

module.

Caution Make sure that devices and circuits connected to the module are properly

insulated from human contact.

Caution When module terminals are live with hazardous voltages, make sure that the

terminals are not accessible by using the high voltage screw terminal enclosure. Refer to

the Assembling the High Voltage Screw Terminal Backshell section for more information.

Software

Software support for your hardware depends on the carrier being used.

Refer to Table 1 for a list of software support.

Examples are included with each software API. Refer to the corresponding

software Getting Started Guide for more information.

Table 1. Devices and Corresponding Components

Device Carrier Software Support

USB-9211 NI 9161 NI-DAQmx Base

USB-9211A NI 9162 NI-DAQmx

USB-9211/9211A User Guide and Specifications 4 ni.com

Related Documentation

If your device uses NI-DAQmx Base, refer to ni.com to download the

software.

Installing the USB-9211/9211A Device

Installing the Software

Before installing the device, you must install the software you plan to use

with the device. Refer to the Software section of this manual and the

documentation included with the software for more information.

Installing the NI USB-9211/9211A in the USB-9161/9162 Carrier

The NI 9211 module and the USB-9161/9162 carrier are packaged

separately. Refer to Figure 3, while completing the following assembly

steps:

1. Make sure that no signals are connected to the NI 9211 module and the

USB cable is not connected to the device.

2. Remove the protective cover from the 15-pin DSUB connector.

Guide Location

NI-DAQmx Getting Started Guide Accessible from Start»All Programs»

National Instruments»NI-DAQ after install.

NI-DAQmx for USB Devices Getting Started

Guide

Ships with your device and, after install,

is accessible from Start»All Programs»

National Instruments»NI-DAQ.

NI-DAQmx Base Getting Started Guide Accessible from Start»All Programs»

National Instruments»NI-DAQmx

Bases»Documentation after install.

©National Instruments Corporation 5 USB-9211/9211A User Guide and Specifications

3. Align the I/O module with the carrier, as shown in Figure 3.

Figure 3. Module Installation

4. Squeeze the latches and insert the NI 9211 module into the carrier.

5. Press firmly on the connector side of the NI 9211 module until the

latches lock the module into place, as shown in Figure 4.

Figure 4. Locking Module into Place

6. Connect the USB cable to the assembled USB-9211/9211A.

1 High Voltage Screw Terminal Backshell

USB-9211/9211A User Guide and Specifications 6 ni.com

Mounting the USB-9211/9211A to a Panel

Threaded inserts are located in the USB-9211/9211A for mounting it to a

panel. Refer to Figure 5 for dimensions.

Figure 5. Module Dimensions

Connecting the USB-9211/9211A to a Computer

Plug one end of the USB cable into the USB-9211/9211A and the other end

into an available USB port on the computer.

LED Indicator

The LED indicator indicates device status.

Table 2. LED State/Device Status

LED State Device Status

Not lit Device not connected or in suspend.

On, not blinking Device connected, but no module installed.

Single-blink Operating normally.

Double-blink Operating normally.

Quadruple-blink Device error. Refer to ni.com/support.

Threaded Insert

M3 x 0.5

8.5 mm (0.34 in.) Max Depth

72.2 mm

(2.84 in.)

85.7 mm

(3.37 in.)

76.1 mm

(3.00 in.)

©National Instruments Corporation 7 USB-9211/9211A User Guide and Specifications

Wiring the USB-9211/9211A

The USB-9211/9211A has a 10-terminal, detachable high voltage screw

terminal enclosure that provides connections for four thermocouple input

channels. Each channel has a terminal to which you can connect the

positive lead of the thermocouple, TC+, and a terminal to which

you can connect the negative lead of the thermocouple, TC–. The

USB-9211/9211A also has a common terminal, COM, that is internally

connected to the isolated ground reference of the module.

Caution The high voltage screw terminal backshell must be installed when using

hazardous voltages (>42.4 Vpk, 60 VDC).

If you are unsure which of the thermocouple leads is positive and which is

negative, check the thermocouple documentation or the thermocouple wire

spool. If you are using shielded wiring, connect one end of the shield to the

COM terminal.

Figure 6. Connecting a Thermocouple Input Signal to the USB-9211/9211A

Thermocouple

TC–

TC+

Shield

USB-9211/9211A

COM

USB-9211/9211A User Guide and Specifications 8 ni.com

Refer to Table 3 for the terminal assignments for each channel.

Assembling the High Voltage Screw Terminal Backshell

The high voltage screw terminal backshell must be installed when using

hazardous voltages (>42.4 Vpk, 60 VDC). Refer to Figure 7 while

completing the following steps:

1. Connect the leads to the screw terminal and secure with the strain

relief.

2. Finish by snapping the backshell around the connector.

Table 3. Terminal Assignments

Module Terminal Signal

0TC0+

1TC0–

2TC1+

3TC1–

4TC2+

5TC2–

6TC3+

7TC3–

8No connection

9Common (COM)

©National Instruments Corporation 9 USB-9211/9211A User Guide and Specifications

Figure 7. High Voltage Screw Terminal Backshell

USB-9211/9211A Circuitry

The USB-9211/9211A channels share a common ground that is isolated

from the chassis and the host computer. Each channel has an impedance

between the TC+and COM terminals and between the TC– and COM

terminals. Each channel is filtered and then sampled by a 24-bit

analog-to-digital converter (ADC). There is 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.

Effects of Source Impedance on Voltage Measurement Accuracy

The resistors shown in Figure 8 produce an input impedance at the

terminals of the USB-9211/9211A.

1 Strain Relief

USB-9211/9211A User Guide and Specifications 10 ni.com

Figure 8. Input Circuitry for One Channel

If thermocouples are connected to the USB-9211/9211A, the gain and

offset errors resulting from the source impedance of the thermocouples are

negligible for most applications. Other voltage sources with a higher source

impedance can introduce more significant errors. For more information

about errors resulting from source impedance, refer to the Specifications

section.

Determining Temperature Measurement Accuracy and

Minimizing Errors

Temperature measurement errors depend in part on the thermocouple type,

the temperature being measured, the accuracy of the thermocouple, and the

cold-junction temperature.

Using the Autozero Channel

The USB-9211/9211A has an internal autozero channel for measuring the

offset error. If the ambient temperature of the USB-9211/9211A is less than

15 °C or more than 35 °C, use this channel to read the offset error. The

USB-9211 always has this channel enabled. Use NI-DAQmx to configure

the behavior of the autozero channel for the USB-9211A. Refer to the

NI-DAQmx Help, accessible from Start»All Programs»National

Instruments»NI-DAQ, for more information.

TC+

TC–

COM

USB-9211/9211A

Input

Impedance

Open

Thermocouple

Detection

Current

Filtered

Differential

Amplifier

Isolated

ADC

10 MΩ

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