National Instruments 9211A User Manual

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.  
NI 9211  
USB-9161/9162  
USB-9211/9211A  
Figure 1. USB-9211/9211A Components  
 
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.  
Table 1. Devices and Corresponding Components  
Device  
Carrier  
NI 9161  
NI 9162  
Software Support  
NI-DAQmx Base  
NI-DAQmx  
USB-9211  
USB-9211A  
Examples are included with each software API. Refer to the corresponding  
software Getting Started Guide for more information.  
© National Instruments Corporation  
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USB-9211/9211A User Guide and Specifications  
   
Related Documentation  
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.  
If your device uses NI-DAQmx Base, refer to ni.com to download the  
software.  
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.  
USB-9211/9211A User Guide and Specifications  
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3. Align the I/O module with the carrier, as shown in Figure 3.  
1
1
High Voltage Screw Terminal Backshell  
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.  
© National Instruments Corporation  
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USB-9211/9211A User Guide and Specifications  
   
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.  
85.7 mm  
(3.37 in.)  
72.2 mm  
(2.84 in.)  
Threaded Insert  
M3 x 0.5  
8.5 mm (0.34 in.) Max Depth  
76.1 mm  
(3.00 in.)  
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  
Not lit  
Device Status  
Device not connected or in suspend.  
Device connected, but no module installed.  
Operating normally.  
On, not blinking  
Single-blink  
Double-blink  
Operating normally.  
Quadruple-blink  
Device error. Refer to ni.com/support.  
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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.  
Shield  
TC+  
Thermocouple  
USB-9211/9211A  
TC–  
COM  
Figure 6. Connecting a Thermocouple Input Signal to the USB-9211/9211A  
© National Instruments Corporation  
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USB-9211/9211A User Guide and Specifications  
Refer to Table 3 for the terminal assignments for each channel.  
Table 3. Terminal Assignments  
Module  
Terminal  
Signal  
TC0+  
0
1
2
3
4
5
6
7
8
9
TC0–  
TC1+  
0
TC1–  
1
2
TC2+  
3
4
5
TC2–  
6
TC3+  
7
8
9
TC3–  
No connection  
Common (COM)  
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.  
USB-9211/9211A User Guide and Specifications  
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1
1
Strain Relief  
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.  
© National Instruments Corporation  
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USB-9211/9211A User Guide and Specifications  
 
TC+  
10 M  
10 MΩ  
TC–  
Input  
Impedance  
Open  
Thermocouple  
Detection  
Current  
Filtered  
Differential  
Amplifier  
Isolated  
ADC  
COM  
USB-9211/9211A  
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.  
USB-9211/9211A User Guide and Specifications  
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Measurement Accuracy for the Different Types  
of Thermocouples  
Figures 9, 10, 11, 12, and 13 show the typical and maximum errors for the  
different thermocouple types when used with the USB-9211/9211A over  
the full temperature range. The figures also show the maximum error for  
the thermocouple types with the USB-9211/9211A at room temperature,  
15 to 35 °C. The figures account for gain errors, offset errors, differential  
errors. The figures do not account for the accuracy of the thermocouple  
itself.  
Temperature gradients across the USB-9211/9211A terminals affect the  
cold-junction temperature accuracy. Refer to the Cold-Junction  
Temperature Measurement Accuracy section for more information about  
temperature gradients.  
6
Max over Temp Range with Autozero  
Max at Room Temp Range without Autozero  
Typ over Temp Range with Autozero  
4
2
0
200  
400  
600  
800  
1000  
1200  
1400  
1600 1800  
Measured Temperature (°C)  
Figure 9. Type B Errors  
© National Instruments Corporation  
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USB-9211/9211A User Guide and Specifications  
 
4
3
2
1
0
Max over Temp Range with Autozero  
Max at Room Temp Range without Autozero  
Typ over Temp Range with Autozero  
–200  
0
200  
400  
600  
800  
1000  
Measured Temperature (°C)  
Figure 10. Type E and T Errors  
4
3
2
1
0
Max over Temp Range with Autozero  
Max at Room Temp Range without Autozero  
Typ over Temp Range with Autozero  
–200  
0
200  
400  
600  
800  
1000  
1200  
Measured Temperature (°C)  
Figure 11. Type J and N Errors  
USB-9211/9211A User Guide and Specifications  
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4
3
2
1
0
Max over Temp Range with Autozero  
Max at Room Temp Range without Autozero  
Typ over Temp Range with Autozero  
–200  
0
200  
400  
600  
800  
1000  
1200  
Measured Temperature (°C)  
Figure 12. Type K Errors  
6
4
2
0
Max over Temp Range with Autozero  
Max at Room Temp Range without Autozero  
Typ over Temp Range with Autozero  
–200  
0
200  
400  
600  
800 1000 1200 1400 1600  
Measured Temperature (°C)  
Figure 13. Type R and S Errors  
Cold-Junction Temperature Measurement Accuracy  
Heat from other nearby heat sources can cause errors in thermocouple  
measurements by heating up the terminals so that they are at a different  
temperature than the cold-junction compensation sensor used to measure  
the cold junction. The thermal gradient generated across the terminals can  
cause the terminals of different channels to be at different temperatures, so  
the resulting measurement creates errors not only in absolute accuracy but  
also in the relative accuracy between channels.  
© National Instruments Corporation  
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USB-9211/9211A User Guide and Specifications  
     
Minimizing Thermal Gradients  
Thermocouple wire can be a significant source of thermal gradients if it  
conducts heat or cold directly to terminal junctions. To minimize these  
errors, follow these guidelines:  
Use small-gauge thermocouple wire. Smaller wire transfers less heat  
to or from the measuring junction.  
Run thermocouple wiring together near the screw-terminal connector  
to keep the wires at the same temperature.  
Avoid running thermocouple wires near hot or cold objects.  
If you connect any extension wires to thermocouple wires, use wires  
made of the same conductive material.  
Specifications  
The following specifications are typical at 25 °C, unless otherwise noted.  
All voltages are relative to COM unless otherwise noted.  
Input Characteristics  
Number of channels................................4 thermocouple channels,  
1 internal autozero channel,  
1 internal cold-junction  
compensation channel  
ADC resolution.......................................24 bits  
Type of ADC ..........................................Delta-sigma  
Input range.............................................. 80 mV, (not software selectable)  
Common-mode range  
Channel-to-COM............................. 1.5 V  
Common-to-earth ground ................ 250 V  
Common-mode rejection ratio (0 to 60 Hz)  
Channel-to-common........................95 dB  
Common-to-earth ground ................>170 dB  
Temperature measurement ranges..........Works over temperature  
ranges defined by NIST  
(J, K, R, S, T, N, E, and  
B thermocouple types)  
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Cold-junction compensation sensor accuracy  
0 to 60 °C........................................ 0.6 °C (1.1 °F) typ,  
1.3 °C (2.3 °F) max  
Conversion time ..................................... 70 ms per channel;  
420 ms total for all channels  
including the autozero and  
cold-junction channels  
Max sampling rate (Hz)  
Type of Measurement  
Number of  
Channels in  
Scan List  
Tempertaure  
with CJC and  
Autozero  
RAW  
Analog  
Input  
Temperature  
with Autozero  
1
2
3
4
4
3
6
4
12  
6
2.4  
2
3
4
2.4  
3
Note: DAQmx Base always applies autozero.  
Input bandwidth (–3 dB)........................ 15 Hz  
Noise rejection ....................................... 85 dB min at 50/60 Hz  
Overvoltage protection........................... 30 V between any input and  
common  
Differential input impedance ................. 20 MΩ  
Input current........................................... 50 nA  
Input noise.............................................. 1 µVrms  
Gain error ............................................... 0.05% max at 25 °C,  
0.06% typ (over temperature)  
0.1% max (over temperature)  
Offset error (with autozeroing) .............. 15 µV typ, 20 µV max  
Gain error from source impedance......... 0.05 ppm per source impedance  
due to input impedance  
© National Instruments Corporation  
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USB-9211/9211A User Guide and Specifications  
Offset error from source impedance.......0.05 µV typ, 0.07 µV max per Ω  
source impedance due to input  
current  
Power Requirements  
Current consumption from USB.............500 mA, max  
Suspend mode..................................2.5 mA, max  
Bus Interface  
USB specification  
USB-9211........................................USB 2.0 full speed  
USB-9211A.....................................USB 2.0 high speed  
Physical Characteristics  
If you need to clean the module, wipe it with a dry towel.  
Dimensions ............................................14 cm × 8.6 cm × 2.5 cm  
(5.51 in. × 3.37 in. × 0.99 in.)  
Weight ....................................................Approx. 350 g (12.3 oz)  
Screw-terminal wiring ............................12 to 24 AWG wire with 10 mm  
(0.39 in.) of insulation stripped  
from the end  
Torque for screw terminals.....................0.5 – 0.6 N · m  
(4.4 – 5.3 lb · in.)  
Safety  
Standards  
The USB-9211/9211A is designed to meet the requirements of the  
following standards of safety for electrical equipment for measurement,  
control, and laboratory use:  
IEC 61010-1, EN 61010-1  
UL 61010-1  
CAN/CSA-C22.2 No. 61010-1  
Note For UL and other safety certifications, refer to the product label, or visit  
ni.com/certification, search by model number or product line, and click the  
appropriate link in the Certification column.  
USB-9211/9211A User Guide and Specifications  
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ni.com  
Voltages  
Connect only voltages that are within these limits.  
Channel-to-COM ................................... 30 V max,  
Measurement Category I  
Measurement Category I is for measurements performed on circuits not  
directly connected to the electrical distribution system referred to as  
MAINS voltage. MAINS is a hazardous live electrical supply system that  
powers equipment. This category is for measurements of voltages from  
specially protected secondary circuits. Such voltage measurements include  
signal levels, special equipment, limited-energy parts of equipment,  
circuits powered by regulated low-voltage sources, and electronics.  
Isolation  
Channel-to-channel......................... No isolation between channels  
Channel-to-earth ground  
Withstand................................. 2,300 Vrms, 5 seconds max  
Continuous............................... 250 Vrms  
,
Measurement Category II  
Measurement Category II is for measurements performed on circuits  
directly connected to the electrical distribution system. This category refers  
to local-level electrical distribution, such as that provided by a standard  
wall outlet (for example, 115 V for U.S. or 230 V for Europe).  
Hazardous Locations  
The USB-9211/9211A is not certified for use in hazardous locations.  
Environmental  
The USB-9211/9211A device is intended for indoor use only.  
Operating temperature  
(IEC 60068-2-1 and IEC 60068-2-2)..... 0 to 60 °C  
Storage temperature  
(IEC 60068-2-1 and IEC 60068-2-2)..... –40 to 85 °C  
Operating humidity  
(IEC 60068-2-56)................................... 10 to 90% RH, noncondensing  
Storage humidity  
(IEC 60068-2-56)................................... 5 to 95% RH, noncondensing  
© National Instruments Corporation  
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USB-9211/9211A User Guide and Specifications  
Maximum altitude...................................2,000 m (at 25 °C ambient  
temperature)  
Pollution Degree (IEC 60664)................2  
Electromagnetic Compatibility  
Emissions................................................EN 55011 Class A at 10 m  
FCC Part 15A above 1 GHz  
Immunity ................................................EN 61326-1:1997 + A2:2001,  
Table 1  
EMC/EMI ...............................................CE, C-Tick, and FCC Part 15  
(Class A) Compliant  
Note For EMC compliance, operate this device with shielded cabling.  
CE Compliance  
This product meets the essential requirements of applicable European  
Directives, as amended for CE marking, as follows:  
Low-Voltage Directive (safety)..............73/23/EEC  
Electromagnetic Compatibility  
Directive (EMC).....................................89/336/EEC  
Note Refer to the Declaration of Conformity (DoC) for this product for any additional  
regulatory compliance information. To obtain the DoC for this product, visit  
ni.com/certification, search by model number or product line, and click the  
appropriate link in the Certification column.  
Calibration  
You can obtain the calibration certificate for the USB-9211/9211A at  
ni.com/calibration.  
Calibration interval.................................1 year  
USB-9211/9211A User Guide and Specifications  
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Where to Go for Support  
The National Instruments Web site is your complete resource for technical  
support. At ni.com/support you have access to everything from  
troubleshooting and application development self-help resources to email  
and phone assistance from NI Application Engineers.  
National Instruments corporate headquarters is located at  
11500 North Mopac Expressway, Austin, Texas, 78759-3504.  
National Instruments also has offices located around the world to help  
address your support needs. For telephone support in the United States,  
create your service request at ni.com/support and follow the calling  
instructions or dial 512 795 8248. For telephone support outside the United  
States, contact your local branch office:  
Australia 1800 300 800, Austria 43 0 662 45 79 90 0,  
Belgium 32 0 2 757 00 20, Brazil 55 11 3262 3599,  
Canada 800 433 3488, China 86 21 6555 7838,  
Czech Republic 420 224 235 774, Denmark 45 45 76 26 00,  
Finland 385 0 9 725 725 11, France 33 0 1 48 14 24 24,  
Germany 49 0 89 741 31 30, India 91 80 41190000,  
Israel 972 0 3 6393737, Italy 39 02 413091, Japan 81 3 5472 2970,  
Korea 82 02 3451 3400, Lebanon 961 0 1 33 28 28,  
Malaysia 1800 887710, Mexico 01 800 010 0793,  
Netherlands 31 0 348 433 466, New Zealand 0800 553 322,  
Norway 47 0 66 90 76 60, Poland 48 22 3390150,  
Portugal 351 210 311 210, Russia 7 095 783 68 51,  
Singapore 1800 226 5886, Slovenia 386 3 425 4200,  
South Africa 27 0 11 805 8197, Spain 34 91 640 0085,  
Sweden 46 0 8 587 895 00, Switzerland 41 56 200 51 51,  
Taiwan 886 02 2377 2222, Thailand 662 278 6777,  
United Kingdom 44 0 1635 523545  
National Instruments, NI, ni.com, and LabVIEW are trademarks of National Instruments Corporation.  
Refer to the Terms of Use section on ni.com/legal for more information about National  
Instruments trademarks. Other product and company names mentioned herein are trademarks or trade  
names of their respective companies. For patents covering National Instruments products, refer to the  
appropriate location: Help»Patents in your software, the patents.txt file on your CD, or  
ni.com/patents.  
© 2005–2006 National Instruments Corporation. All rights reserved.  
371566B-01  
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