National Instruments NI USB 9229 User Manual

USER GUIDE AND SPECIFICATIONS  
NI USB-9229/9239  
4-Channel, 24-Bit Analog Voltage Input Module  
This user guide describes how to use the National Instruments  
USB-9229/9239 and lists the device specifications. In this document,  
the NI USB-9229 and NI USB-9239 are referred to inclusively as the  
NI USB-9229/9239.  
Introduction  
The NI USB-9229/9239 provides a USB interface for four channels of  
24-bit simultaneous analog input with integrated signal conditioning. The  
NI USB-9229/9239 consists of two components: an NI 9229/9239 module  
and an NI USB-9162 carrier, as shown in Figure 1.  
NI 9229/9239  
H i - S p e e d U S B C a r r i e  
N I  
U
S B - 9 1 6 2  
NI USB-9162  
r
H i - S P  
N
I
U
e e d U S B C a r r i e  
S
B - 9 1 6 2  
r
NI USB-9229/9239  
Figure 1. NI USB-9229/9239 Components  
 
Caution Make sure that devices and circuits connected to the module are properly  
insulated from human contact.  
Caution When module terminals are hazardous voltage LIVE (>42.4Vpk/60 VDC), you  
must ensure that devices and circuits connected to the module are properly insulated from  
human contact. You must use the NI 9971 connector backshell kit to ensure that the  
terminals are not accessible.  
Figure 3 shows the NI 9971 connector backshell.  
Figure 3. NI 9971 Connector Backshell  
Refer to the Installing the NI USB-9229/9239 Device for more information  
about installing the backshell.  
Related Documentation  
Each application software package and driver includes information about  
writing applications for taking measurements and controlling measurement  
devices. The following references to documents assume you have  
NI-DAQmx 8.7 or later, and where applicable, version 7.1 or later of the  
NI application software.  
NI-DAQmx for Windows  
The DAQ Getting Started Guide describes how to install your NI-DAQmx  
for Windows software, your NI-DAQmx-supported DAQ device, and  
how to confirm that your device is operating properly. Select Start»All  
Programs»National Instruments»NI-DAQ»DAQ Getting Started  
Guide.  
The NI-DAQ Readme lists which devices are supported by this version of  
NI-DAQ. Select Start»All Programs»National Instruments»NI-DAQ»  
NI-DAQ Readme.  
© National Instruments Corporation  
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NI USB-9229/9239 User Guide and Specifications  
 
The NI-DAQmx Help contains general information about measurement  
concepts, key NI-DAQmx concepts, and common applications that are  
applicable to all programming environments. Select Start»All  
Programs»National Instruments»NI-DAQ»NI-DAQmx Help.  
LabVIEW  
If you are a new user, use the Getting Started with LabVIEW manual  
to familiarize yourself with the LabVIEW graphical programming  
environment and the basic LabVIEW features you use to build data  
acquisition and instrument control applications. Open the Getting Started  
with LabVIEW manual by selecting Start»All Programs»National  
Instruments»LabVIEW»LabVIEW Manuals or by navigating to the  
labview\manuals directory and opening LV_Getting_Started.pdf.  
Use the LabVIEW Help, available by selecting Help»Search the  
LabVIEW Help in LabVIEW, to access information about LabVIEW  
programming concepts, step-by-step instructions for using LabVIEW, and  
reference information about LabVIEW VIs, functions, palettes, menus, and  
tools. Refer to the following locations on the Contents tab of the LabVIEW  
Help for information about NI-DAQmx:  
Getting Started»Getting Started with DAQ—Includes overview  
information and a tutorial to learn how to take an NI-DAQmx  
measurement in LabVIEW using the DAQ Assistant.  
VI and Function Reference»Measurement I/O VIs and  
Functions—Describes the LabVIEW NI-DAQmx VIs and properties.  
Taking Measurements—Contains the conceptual and how-to  
information you need to acquire and analyze measurement data in  
LabVIEW, including common measurements, measurement  
fundamentals, NI-DAQmx key concepts, and device considerations.  
LabWindows/CVI  
The Data Acquisition book of the LabWindows/CVI Help contains  
measurement concepts for NI-DAQmx. This book also contains Taking  
an NI-DAQmx Measurement in LabWindows/CVI, which includes  
step-by-step instructions about creating a measurement task using the DAQ  
TM  
TM  
Assistant. In LabWindows /CVI , select Help»Contents, then select  
Using LabWindows/CVI»Data Acquisition.  
The NI-DAQmx Library book of the LabWindows/CVI Help contains  
API overviews and function reference for NI-DAQmx. Select Library  
Reference»NI-DAQmx Library in the LabWindows/CVI Help.  
NI USB-9229/9239 User Guide and Specifications  
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ni.com  
Measurement Studio  
If you program your NI-DAQmx-supported device in Measurement Studio  
using Visual C++, Visual C#, or Visual Basic .NET, you can interactively  
create channels and tasks by launching the DAQ Assistant from MAX or  
from within Visual Studio .NET. You can generate the configuration code  
based on your task or channel in Measurement Studio. Refer to the DAQ  
Assistant Help for additional information about generating code. You also  
can create channels and tasks, and write your own applications in your  
ADE using the NI-DAQmx API.  
For help with NI-DAQmx methods and properties, refer to the NI-DAQmx  
.NET Class Library or the NI-DAQmx Visual C++ Class Library included  
in the NI Measurement Studio Help. For general help with programming in  
Measurement Studio, refer to the NI Measurement Studio Help, which is  
fully integrated with the Microsoft Visual Studio .NET help. To view  
this help file in Visual Studio. NET, select Measurement Studio»  
NI Measurement Studio Help.  
To create an application in Visual C++, Visual C#, or Visual Basic .NET,  
follow these general steps:  
1. In Visual Studio .NET, select File»New»Project to launch the New  
Project dialog box.  
2. Find the Measurement Studio folder for the language you want to  
create a program in.  
3. Choose a project type. You add DAQ tasks as a part of this step.  
ANSI C without NI Application Software  
The NI-DAQmx Help contains API overviews and general information  
about measurement concepts. Select Start»All Programs»National  
Instruments»NI-DAQ»NI-DAQmx Help.  
The NI-DAQmx C Reference Help describes the NI-DAQmx Library  
functions, which you can use with National Instruments data acquisition  
devices to develop instrumentation, acquisition, and control applications.  
Select Start»All Programs»National Instruments»NI-DAQ»  
NI-DAQmx C Reference Help.  
.NET Languages without NI Application Software  
With the Microsoft .NET Framework version 1.1 or later, you can use  
NI-DAQmx to create applications using Visual C# and Visual Basic .NET  
without Measurement Studio. You need Microsoft Visual Studio  
.NET 2003 or Microsoft Visual Studio 2005 for the API documentation to  
be installed.  
© National Instruments Corporation  
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NI USB-9229/9239 User Guide and Specifications  
The installed documentation contains the NI-DAQmx API overview,  
measurement tasks and concepts, and function reference. This help is fully  
integrated into the Visual Studio .NET documentation. To view the  
NI-DAQmx .NET documentation, go to Start»Programs»National  
Instruments»NI-DAQ»NI-DAQmx .NET Reference Help. Expand  
NI Measurement Studio Help»NI Measurement Studio .NET Class  
Library»Reference to view the function reference. Expand  
NI Measurement Studio Help»NI Measurement Studio .NET Class  
Library»Using the Measurement Studio .NET Class Libraries to  
view conceptual topics for using NI-DAQmx with Visual C# and Visual  
Basic .NET.  
To get to the same help topics from within Visual Studio, go to Help»  
Contents. Select Measurement Studio from the Filtered By drop-down  
list and follow the previous instructions.  
Device Documentation and Specifications  
NI-DAQmx includes the Device Document Browser, which contains  
online documentation for supported DAQ, SCXI, and switch devices, such  
as help files describing device pinouts, features, and operation, and PDF  
files of the printed device documents. You can find, view, and/or print the  
documents for each device using the Device Document Browser at any  
time by inserting the CD. After installing the Device Document Browser,  
device documents are accessible from Start»All Programs»National  
Instruments»NI-DAQ»Browse Device Documentation.  
Note You can also download these documents at ni.com/manuals.  
Training Courses  
If you need more help getting started developing an application with  
NI products, NI offers training courses. To enroll in a course or obtain a  
detailed course outline, refer to ni.com/training.  
Technical Support on the Web  
For additional support, refer to ni.com/support or zone.ni.com.  
Installing the Software  
Software support for the NI USB-9229/9239 for Windows Vista/XP/2000  
is provided by NI-DAQmx. The DAQ Getting Started Guide, which you  
can download at ni.com/manuals, offers NI-DAQmx users step-by-step  
instructions for installing software and hardware, configuring channels and  
tasks, and getting started developing an application.  
NI USB-9229/9239 User Guide and Specifications  
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Installing Other Software  
If you are using other software, refer to the installation instructions that  
accompany your software.  
Example Programs  
The NI-DAQmx CD contains example programs that you can use to get  
started programming with the NI USB-9229/9239. Refer to the NI-DAQmx  
for USB Devices Getting Started Guide that shipped with your device, and  
is also accessible from Start»All Programs»National Instruments»  
NI-DAQ, for more information.  
Installing the NI USB-9229/9239 Device  
Before installing the device, you must install the software you plan to use  
with the device. Refer to the Installing the Software section of this guide  
and the documentation included with the software for more information.  
Installing the NI 9229/9239 Device into the NI USB-9162 Carrier  
The NI 9229/9239 module and NI USB-9162 carrier are packaged  
separately. Refer to Figure 4, while completing the following assembly  
steps:  
1. Make sure that no signals are connected to the NI 9229/9239 module  
and the USB cable is not connected to the device.  
2. Remove the protective cover from the 15-pin D-SUB connector.  
3. Align the I/O module with the carrier, as shown in Figure 4.  
Figure 4. Module Installation  
4. Squeeze the latches and insert the NI 9229/9239 module into the  
NI USB-9162 carrier.  
© National Instruments Corporation  
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NI USB-9229/9239 User Guide and Specifications  
   
5. Press firmly on the connector side of the NI 9229/9239 module until  
the latches lock the module into place, as shown in Figure 5.  
Figure 5. Locking Module into Place  
Mounting the NI USB-9229/9239 to a Panel  
Threaded inserts are located in the NI USB-9229/9239 for mounting it to a  
panel. Refer to Figure 6 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 6. Module Dimensions In Millimeters (Inches)  
Connecting the NI USB-9229/9239 to a Computer  
Plug one end of the USB cable into the NI USB-9229/9239 and the other  
end into an available USB port on the computer. Refer to the NI-DAQmx  
for USB Devices Getting Started Guide that shipped with your device, and  
is also accessible from Start»All Programs»National Instruments»  
NI-DAQ, for more information.  
NI USB-9229/9239 User Guide and Specifications  
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LED Indicator  
The NI USB-9229/9239 device has a green LED next to the USB  
connector. The LED indicator indicates device status, as listed in Table 1.  
When the device is connected to a USB port, the LED blinks steadily to  
indicate that the device is initialized and is receiving power from the  
connection.  
If the LED is not blinking, it may mean that the device is not initialized or  
the computer is in standby mode. In order for the device to be recognized,  
the device must be connected to a computer that has NI-DAQmx installed  
on it. If your device is not blinking, make sure your computer has the latest  
version of NI-DAQmx installed on it, and the computer is not in standby  
mode.  
Table 1. 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  
Connected to USB Full-Speed port. Device  
performance might be affected. Refer to the  
Specifications section for more information.  
Quadruple-blink  
Device error. Refer to ni.com/support.  
Wiring the NI USB-9229/9239  
Note Table 2 illustrates the accessories available from ni.com for use with the  
NI USB-9229/9239.  
Table 2. Accessories  
Accessory  
Accessory Description  
Strain relief and high-voltage backshell  
2-position screw-terminal plug  
NI 9971  
NI 9976  
The NI USB-9229/9239 has four 2-terminal detachable screw-terminal  
connectors that provide connections for four simultaneously sampled,  
isolated analog input channels. Connect the positive signal of the signal  
source to the AI+ terminal, and connect the negative signal of the signal  
© National Instruments Corporation  
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NI USB-9229/9239 User Guide and Specifications  
   
source to the AI– terminal. Refer to Table 3 for the terminal assignments  
for each channel.  
Table 3. Terminal Assignments  
Module  
Channel  
Terminal  
Signal  
0+  
AI0+  
0
0–  
1+  
1–  
2+  
2–  
3+  
3–  
AI0–  
AI1+  
AI1–  
AI2+  
AI2–  
AI3+  
AI3–  
0+  
0-  
Ch 0  
Ch 1  
Ch 2  
1+  
1-  
1
2
3
2+  
2-  
3+  
3-  
Ch 3  
Wiring for High-Vibration Applications  
If an application is subject to high vibration, National Instruments  
recommends that you either use ferrules to terminate wires to the  
detachable screw-terminal connector or use the NI 9971 backshell  
kit to protect the connections. Refer to Figure 7 for an illustration.  
Figure 7. 2-Terminal Detachable Screw-Terminal Connector with Ferrule  
NI USB-9229/9239 User Guide and Specifications  
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You can connect ground-referenced or floating signal sources to the  
NI USB-9229/9239. If you make a ground-referenced connection between  
the signal source and the NI USB-9229/9239, make sure the voltage on  
the AI+ and AI– connections are in the channel-to-earth safety voltage  
range to ensure proper operation of the NI USB-9229/9239. Refer to the  
Specifications section for more information about operating voltages and  
overvoltage protection.  
Figures 8 and 9 illustrate connecting grounded and floating signal sources  
to the NI USB-9229/9239.  
Signal  
Source  
AI+  
+
NI USB-9229/9239  
AI–  
Figure 8. Connecting a Grounded Signal Source to the NI USB-9229/9239  
Signal  
Source  
AI+  
+
NI USB-9229/9239  
AI–  
Figure 9. Connecting a Floating Signal Source to the NI USB-9229/9239  
NI USB-9229/9239 Circuitry  
The NI USB-9229/9239 analog input channels are floating with respect to  
earth ground and each other. The incoming analog signal on each channel  
is conditioned, buffered, and then sampled by a 24-bit Delta-Sigma ADC.  
© National Instruments Corporation  
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NI USB-9229/9239 User Guide and Specifications  
   
Each channel provides an independent signal path and ADC, enabling you  
to sample all four channels simultaneously. Refer to Figure 10 for an  
illustration of the circuitry for one channel.  
AI+  
Overvoltage  
ADC  
Protection  
AI–  
Amplifier Prefilter  
NI USB-9229/9239  
Figure 10. Input Circuitry for One Channel  
Understanding NI USB-9229/9239 Filtering  
The NI USB-9229/9239 uses a combination of analog and digital filtering  
to provide an accurate representation of in-band signals while rejecting  
out-of-band signals. The filters discriminate between signals based on  
the frequency range, or bandwidth, of the signal. The three important  
bandwidths to consider are the passband, the stopband, and the alias-free  
bandwidth.  
The NI USB-9229/9239 represents signals within the passband, as  
quantified primarily by passband ripple and phase nonlinearity. All signals  
that appear in the alias-free bandwidth are either unaliased signals or  
signals that have been filtered by at least the amount of the stopband  
rejection.  
NI USB-9229/9239 User Guide and Specifications  
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Passband  
The signals within the passband have frequency-dependent gain or  
attenuation. The small amount of variation in gain with respect to  
frequency is called the passband flatness. The digital filters of the  
NI USB-9229/9239 adjust the frequency range of the passband to match  
the data rate. Therefore, the amount of gain or attenuation at a given  
frequency depends on the data rate. Figure 11 shows typical passband  
flatness for the 50 kS/s data rate.  
0.025  
0.000  
–0.025  
–0.050  
0
5
10  
15  
20  
25  
Frequency (kHz)  
Figure 11. Typical Passband Response  
Stopband  
The filter significantly attenuates all signals above the stopband frequency.  
The primary goal of the filter is to prevent aliasing. Therefore, the stopband  
frequency scales precisely with the data rate. The stopband rejection is the  
minimum amount of attenuation applied by the filter to all signals with  
frequencies within the stopband.  
Alias-Free Bandwidth  
Any signal that appears in the alias-free bandwidth of the  
NI USB-9229/9239 is not an aliased artifact of signals at a higher  
frequency. The alias-free bandwidth is defined by the ability of the filter to  
reject frequencies above the stopband frequency and equals the data rate  
minus the stopband frequency.  
© National Instruments Corporation  
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NI USB-9229/9239 User Guide and Specifications  
 
Specifications  
The following specifications are typical for the range 0 to 60 °C  
unless otherwise noted. All voltages are relative to the AI– signal on each  
channel unless otherwise noted.  
Input Characteristics  
Number of channels................................4 analog input channels  
ADC resolution.......................................24 bits  
Type of ADC ..........................................Delta-Sigma (with analog  
prefiltering)  
Sampling mode.......................................Simultaneous  
Data rate range (fs)  
Minimum.........................................1.613 kS/s  
Maximum ........................................50 kS/s1  
50kS/s  
----------------  
Data rates (fs)..........................................  
, n = 1, 2, ... 31.  
n
Master timebase (internal)  
Frequency ........................................12.8 MHz  
Accuracy.......................................... 100 ppm max  
Operating voltage ranges2  
Measurement Voltage, AI+ to AI–  
Nominal (V)  
Typical (V)  
62.64  
Minimum (V)  
61.5  
NI USB-9229  
NI USB-9239  
60  
10  
10.52  
10.3  
Overvoltage protection ........................... 100 V  
Input coupling.........................................DC  
Input impedance (AI+ to AI–)................1 MΩ  
1
2
Full performance requires the use of a USB 2.0 Hi-Speed host controller and USB 2.0 hubs.  
Refer to the Safety Guidelines section for more information about safe operating voltages.  
NI USB-9229/9239 User Guide and Specifications  
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Accuracy, NI USB-9229  
Percent of  
Reading  
Percent of  
Range*  
Error  
(Gain Error)  
(Offset Error)  
Calibrated max (–0 to 60 °C)  
Calibrated typ (25 °C, 5 °C)  
0.13%  
0.03%  
1.2%  
0.05%  
0.008%  
0.55%  
0.11%  
Uncalibrated max (0 to 60 °C)  
Uncalibrated typ (25 °C, 5 °C)  
* Range equals 62.64 V  
0.3%  
Accuracy, NI USB-9239  
Percent of  
Reading  
Percent of  
Range*  
Error  
(Gain Error)  
(Offset Error)  
Calibrated max (0 to 60 °C)  
Calibrated typ (25 °C, 5 °C)  
Uncalibrated max (0 to 60 °C)  
Uncalibrated typ (25 °C, 5 °C)  
* Range equals 10.52 V  
0.13%  
0.03%  
1.4%  
0.05%  
0.008%  
0.67%  
0.11%  
0.3%  
Input noise  
NI USB-9229 .................................. 320 μVrms  
NI USB-9239 .................................. 70 μVrms  
Stability  
Gain drift......................................... 5 ppm/°C  
Offset drift  
NI USB-9229........................... 150 μV/°C  
NI USB-9239........................... 24 μV/°C  
Post calibration gain match  
(ch-to-ch, 20 kHz).................................. 0.22 dB max  
Crosstalk (1 kHz) ................................... –130 dB  
Phase mismatch (ch-to-ch)  
NI USB-9229 .................................. 0.045°/kHz max  
NI USB-9239 .................................. 0.075°/kHz max  
Phase mismatch (module-to-module, max)  
© National Instruments Corporation  
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NI USB-9229/9239 User Guide and Specifications  
1
1
NI USB-9229...................................0.045°/kHz + 360°· fin/Mclk  
NI USB-9239...................................0.075°/kHz + 360°· fin/Mclk  
Phase nonlinearity (fs = 50 kS/s).............0.11° max  
Input delay  
NI USB-9229...................................38.4/fs + 2.6 μs  
NI USB-9239...................................38.4/fs + 3 μs  
Passband  
Frequency ........................................0.453 · fs  
Flatness (fs = 50 kS/s)...................... 100 mdB max  
Stopband  
Frequency ........................................0.547 · fs  
Rejection..........................................100 dB  
Alias-free bandwidth ..............................0.453 · fs  
–3 dB prefilter bandwidth  
(fs = 50 kS/s) ...........................................24.56 kHz  
CMRR (fin = 60 Hz)  
NI USB-9229...................................116 dB  
NI USB-9239...................................126 dB  
SFDR (1 kHz, –60 dBFS).......................–128 dBFS  
Total Harmonic Distortion (THD)  
1 kHz, –1 dBFS ...............................–99 dB  
1 kHz, –20 dBFS .............................–105 dB  
Power Requirements  
Current consumption from USB.............500 mA, max  
Suspend mode..................................2.5 mA, max  
Bus Interface  
USB specification...................................USB 2.0 Hi-Speed  
1
Mclk is the master timebase.  
NI USB-9229/9239 User Guide and Specifications  
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ni.com  
Physical Characteristics  
Screw-terminal wiring............................ 16 to 28 AWG copper conductor  
wire with 7 mm (0.28 in.) of  
insulation stripped from the end  
Torque for screw terminals .................... 0.22 to 0.25 N · m  
(1.95 to 2.21 lb · in.)  
Ferrules................................................... 0.25 mm2 to 0.5 mm2  
Weight.................................................... 249 g (8.8 oz)  
Safety  
If you need to clean the module, wipe it with a dry towel.  
Safety Voltages  
Isolation  
Channel-to-earth ground  
Continuous............................... 250 Vrms  
,
Measurement Category II  
Withstand................................. 2300 Vrms, verified by a 5 s  
dielectric withstand test  
Channel-to-channel  
Continuous............................... 250 Vrms  
,
Measurement Category II  
Withstand................................. 1390 Vrms, verified by a 5 s  
dielectric withstand test  
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. Do not  
connect the NI USB-9229/9239 to signals or use for measurements within  
Measurement Categories III or IV.  
Safety Standards  
This product 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, CSA 61010-1  
© National Instruments Corporation  
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NI USB-9229/9239 User Guide and Specifications  
Note For UL and other safety certifications, refer to the product label or visit ni.com/  
certification, search for the module number or product line, and click the appropriate  
link in the Certification column.  
Hazardous Locations  
The NI USB-9229/9239 is not certified for use in hazardous locations.  
Environmental  
The NI USB-9229/9239 devices are intended for indoor use only but may  
be used outdoors if installed in a suitable enclosure.  
Operating temperature  
(IEC 60068-2-1, IEC 60068-2-2) ...........0 to 60 °C  
Storage temperature  
(IEC 60068-2-1, 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  
Maximum altitude...................................2,000 m  
Pollution Degree (IEC 60664)................2  
Electromagnetic Compatibility  
This product is designed to meet the requirements of the following  
standards of EMC for electrical equipment for measurement, control,  
and laboratory use:  
EN 61326 EMC requirements; Industrial Immunity  
EN 55011 Emissions; Group 1, Class A  
CE, C-Tick, ICES, and FCC Part 15 Emissions; Class A  
Note For EMC compliance, operate this device with shielded cabling.  
NI USB-9229/9239 User Guide and Specifications  
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CE Compliance  
This product meets the essential requirements of applicable European  
Directives, as amended for CE marking, as follows:  
2006/95/EC; Low-Voltage Directive (safety)  
2004/108/EEC; Electromagnetic Compatibility Directive (EMC)  
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.  
Environmental Management  
National Instruments is committed to designing and manufacturing  
products in an environmentally responsible manner. NI recognizes that  
eliminating certain hazardous substances from our products is beneficial  
not only to the environment but also to NI customers.  
For additional environmental information, refer to the NI and the  
Environment Web page at ni.com/environment. This page contains the  
environmental regulations and directives with which NI complies, as well  
as other environmental information not included in this document.  
Waste Electrical and Electronic Equipment (WEEE)  
EU Customers At the end of their life cycle, all products must be sent to a WEEE recycling  
center. For more information about WEEE recycling centers and National Instruments  
WEEE initiatives, visit ni.com/environment/weee.htm.  
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(For information about China RoHS compliance, go to  
.)  
Calibration  
You can obtain the calibration certificate and information about calibration  
services for the NI USB-9229/9239 at ni.com/calibration.  
Calibration interval ................................ 1 year  
© National Instruments Corporation  
19  
NI USB-9229/9239 User Guide and Specifications  
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.  
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© 2007 National Instruments Corporation. All rights reserved.  
372409A-01  
Dec07  

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