National Instruments Network Card NI 9234 User Manual

OPERATING INSTRUCTIONS AND SPECIFICATIONS  
NI 9234  
4-Channel, 5 V, 24-Bit Software-Selectable  
IEPE and AC/DC Analog Input Module  
Français Deutsch  
ni.com/manuals  
 
Safety Guidelines  
Operate the NI 9234 only as described in these operating  
instructions.  
Hot Surface This icon denotes that the component may be  
hot. Touching this component may result in bodily injury.  
Safety Guidelines for Hazardous Locations  
The NI 9234 is suitable for use in Class I, Division 2, Groups A, B,  
C, D, T4 hazardous locations; Class I, Zone 2, AEx nA IIC T4, and  
Ex nA IIC T4 hazardous locations; and nonhazardous locations  
only. Follow these guidelines if you are installing the NI 9234 in a  
potentially explosive environment. Not following these guidelines  
may result in serious injury or death.  
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.  
© National Instruments Corp.  
3
NI 9234 Operating Instructions and Specifications  
 
Caution Substitution of components may impair  
suitability for Class I, Division 2.  
Caution For Zone 2 applications, install the system  
in an enclosure rated to at least IP 54 as defined by  
IEC 60529 and EN 60529.  
Caution For Zone 2 applications, connected signals must  
be within the following limit:  
Capacitance..........................0.2 μF max  
Special Conditions for Hazardous Locations Use in Europe  
This equipment has been evaluated as Ex nA IIC T4 equipment  
under DEMKO Certificate No. 07 ATEX 0626664X. Each module  
is marked  
II 3G and is suitable for use in Zone 2 hazardous  
locations. If you are using the NI 9234 in Gas Group IIC hazardous  
locations or in ambient temperatures of –40 °C Ta 70 °C, you  
must use the device in an NI chassis that has been evaluated as  
EEx nC IIC T4, Ex nA IIC T4, or Ex nL IIC T4 equipment.  
NI 9234 Operating Instructions and Specifications  
4
ni.com  
 
Special Conditions for Marine Applications  
Some modules are Lloyd’s Register (LR) Type Approved for  
marine applications. To verify Lloyd’s Register certification, visit  
ni.com/certification and search for the LR certificate, or  
look for the Lloyd’s Register mark on the module.  
Caution To meet radio frequency emission requirements  
for marine applications, use shielded cables and install  
the system in a metal enclosure. Suppression ferrites  
must be installed on power supply inputs near power  
entries to modules and controllers. Power supply and  
module cables must be separated on opposite sides of the  
enclosure and must enter and exit through opposing  
enclosure walls.  
© National Instruments Corp.  
5
NI 9234 Operating Instructions and Specifications  
 
Connecting the NI 9234  
The NI 9234 has four BNC connectors that provide connections to  
four simultaneously sampled analog input channels.  
AI0+  
AI0–  
AI1+  
AI1–  
AI2+  
AI2–  
AI3+  
AI3–  
Figure 1. NI 9234 Connector Assignments  
NI 9234 Operating Instructions and Specifications  
6
ni.com  
 
Each channel has a BNC connector to which you can connect  
a signal source. You can also enable excitation current on a  
per-channel basis to connect Integrated Electronics Piezoelectric  
(IEPE) sensors. Refer to the NI 9234 Circuitry section for more  
information. The center pin of the connector, AI+, provides the DC  
excitation, when enabled, and the positive input signal connection.  
The shell of the connector, AI–, provides the excitation return path  
and the signal ground reference.  
Connecting Signal Sources to the NI 9234  
You can connect ground-referenced or floating signal sources to  
the NI 9234. To avoid picking up ground noise, use a floating  
connection. To further minimize ground noise, prevent the metal  
shells of the BNC connectors from coming in contact with each  
other, the modules, or the chassis.  
If you make a ground-referenced connection between the signal  
source and the NI 9234, make sure the voltage on the AI– shell  
is in the common-mode range to ensure proper operation of the  
NI 9234. The AI– shell is protected against accidental contact with  
overvoltages within the overvoltage protection range. Refer to the  
Specifications section for more information about operating  
voltages and overvoltage protection.  
© National Instruments Corp.  
7
NI 9234 Operating Instructions and Specifications  
 
Refer to Figures 2 and 3 for illustrations of connecting grounded  
and floating signal sources to the NI 9234.  
Signal  
Source  
AI+  
AI–  
+
NI 9234  
Common  
Mode  
Voltage  
Figure 2. Connecting a Grounded Signal Source to the NI 9234  
NI 9234 Operating Instructions and Specifications  
8
ni.com  
 
 
Signal  
Source  
AI+  
AI–  
+
NI 9234  
Figure 3. Connecting a Floating Signal Source to the NI 9234  
The NI 9234 can also provide an IEPE excitation current for each  
channel to measure ground-referenced or floating IEPE sensors.  
Typical IEPE sensors have a case that is electrically isolated from  
the IEPE electronics, so connecting the sensor to the NI 9234  
results in a floating connection even though the case of the sensor  
is grounded.  
© National Instruments Corp.  
9
NI 9234 Operating Instructions and Specifications  
 
 
NI 9234 Circuitry  
The NI 9234 analog input channels are referenced to chassis  
ground through a 50 Ω resistor. To minimize ground noise, make  
sure the chassis ground is connected to earth ground. Each channel  
is protected from overvoltages. The input signal on each channel is  
buffered, conditioned, and then sampled by a 24-bit Delta-Sigma  
ADC. You can configure each channel in software for AC or DC  
coupling. For channels set to AC coupling, you can turn the IEPE  
excitation current on or off. Refer to the software help for  
information about configuring channels on the NI 9234.  
NI 9234 Operating Instructions and Specifications 10  
ni.com  
 
 
2 mA IEPE on/off  
AC/DC Coupling  
AI+  
AI–  
+
ADC  
Current  
Limiting  
Diodes  
50 Ω  
Common  
Mode  
Bias  
Amplifier  
and  
Prefilter  
Current  
NI 9234  
Figure 4. NI 9234 Input Circuitry for One Channel  
The NI 9234 uses common-mode bias current to bias the  
current-limiting diodes when IEPE current is turned off. When the  
NI 9234 is using grounded signal sources, this current causes an  
error that is dependent on the AI– lead impedance. This error is  
approximately 50 ppm of range and 15 ppm of reading per Ω of  
AI– impedance. The common-mode bias current causes an error  
only with grounded sources and is not an issue with floating signal  
sources. For best accuracy, use a floating connection or use  
low-impedance leads when connecting grounded signal sources.  
© National Instruments Corp.  
11 NI 9234 Operating Instructions and Specifications  
 
Signal  
Source  
AI+  
AI–  
+
Common  
Mode  
Bias  
AI– Lead  
Impedance  
Current  
NI 9234  
Figure 5. Measurement Error Introduced by Common-Mode Bias Current  
The NI 9234 also has TEDS circuitry. For more information about  
TEDS, go to ni.com/info and enter rdteds.  
NI 9234 Operating Instructions and Specifications 12  
ni.com  
 
Understanding NI 9234 Filtering  
The NI 9234 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 9234 represents signals within the passband, as quantified  
primarily by passband flatness 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.  
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 9234 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 6 shows typical  
passband flatness for the NI 9234.  
© National Instruments Corp.  
13 NI 9234 Operating Instructions and Specifications  
 
0.025  
0.000  
–0.025  
–0.050  
0
0.1  
0.2  
0.3  
0.4  
0.5  
Frequency/Data Rate  
Figure 6. NI 9234 Typical Passband Flatness  
NI 9234 Operating Instructions and Specifications 14  
ni.com  
 
 
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 9234  
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 it is equal to the  
data rate minus the stopband frequency.  
© National Instruments Corp.  
15 NI 9234 Operating Instructions and Specifications  
 
Understanding NI 9234 Data Rates  
The frequency of a master timebase (fM) controls the data rate (fs)  
of the NI 9234. The NI 9234 includes an internal master timebase  
with a frequency of 13.1072 MHz, but the module also can accept  
an external master timebase or export its own master timebase. To  
synchronize the data rate of an NI 9234 with other modules that use  
master timebases to control sampling, all of the modules must  
share a single master timebase source. Refer to the software help  
for information about configuring the master timebase source for  
the NI 9234. Visit ni.com/info and enter cseriesdoc for  
information about C Series documentation.  
The following equation provides the available data rates of the  
NI 9234:  
f
÷ 256  
n
--M------------------  
fs =  
where n is any integer from 1 to 31.  
However, the data rate must remain within the appropriate data rate  
range. Refer to the Specifications section for more information  
about the data rate range. When using the internal master timebase  
NI 9234 Operating Instructions and Specifications 16  
ni.com  
 
 
of 13.1072 MHz, the result is data rates of 51.2 kS/s, 25.6 kS/s,  
17.067 kS/s, and so on down to 1.652 kS/s, depending on the value  
of n. When using an external timebase with a frequency other than  
13.1072 MHz, the NI 9234 has a different set of data rates.  
Note The cRIO-9151 R Series Expansion chassis does  
not support sharing timebases between modules.  
Sleep Mode  
This module supports a low-power sleep mode. Support for sleep  
mode at the system level depends on the chassis that the module is  
plugged into. Refer to the chassis manual for information about  
support for sleep mode. If the chassis supports sleep mode, refer to  
the software help for information about enabling sleep mode. Visit  
ni.com/info and enter cseriesdoc for information about  
C Series documentation.  
Typically, when a system is in sleep mode, you cannot  
communicate with the modules. In sleep mode, the system  
consumes minimal power and may dissipate less heat than it does  
in normal mode. Refer to the Specifications section for more  
information about power consumption and thermal dissipation.  
© National Instruments Corp.  
17 NI 9234 Operating Instructions and Specifications  
 
Specifications  
The following specifications are typical for the range –40 to 70 °C  
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  
Type of TEDS supported ..................IEEE 1451.4 TEDS Class I  
Internal master timebase (fM)  
Frequency...................................13.1072 MHz  
Accuracy..................................... 50 ppm max  
Data rate range (fs) using internal master timebase  
Minimum....................................1.652 kS/s  
Maximum ...................................51.2 kS/s  
NI 9234 Operating Instructions and Specifications 18  
ni.com  
 
 
Data rate range (fs) using external master timebase  
Minimum....................................0.391 kS/s  
Maximum ...................................52.734 kS/s  
f
÷ 256  
n
--M------------------  
1
Data rates (fs)...................................  
, n = 1, 2, …, 31  
Input coupling...................................AC/DC (software-selectable)  
AC cutoff frequency  
–3 dB ..........................................0.5 Hz  
–0.1 dB.......................................4.6 Hz max  
1
The data rate must remain within the appropriate data rate range. Refer to the  
Understanding NI 9234 Data Rates section for more information.  
© National Instruments Corp.  
19 NI 9234 Operating Instructions and Specifications  
 
AC cutoff frequency response  
0.5  
0.0  
–0.5  
–1.0  
0
1
2
3
4
5
6
7
8
9
10  
Frequency (Hz)  
NI 9234 Operating Instructions and Specifications 20  
ni.com  
 
Input range........................................ 5 V  
AC voltage full-scale range  
Minimum.................................... 5 Vpk  
Typical........................................ 5.1 Vpk  
Maximum ................................... 5.2 Vpk  
Common-mode voltage range  
(AI– to earth ground)........................ 2 V max  
IEPE excitation current (software-selectable on/off)  
Minimum....................................2.0 mA  
Typical........................................2.1 mA  
Power-on glitch.................................90 μA for 10 μs  
© National Instruments Corp.  
21 NI 9234 Operating Instructions and Specifications  
 
IEPE compliance voltage..................19 V max  
If you are using an IEPE sensor, use the following equation to make  
sure your configuration meets the IEPE compliance voltage range.  
(Vcommon-mode + Vbias Vfull-scale) must be 0 to 19  
where Vcommon-mode is the common-mode voltage applied  
to the NI 9234  
Vbias is the bias voltage of the IEPE sensor  
Vfull-scale is the full-scale voltage of the IEPE sensor  
Overvoltage protection (with respect to chassis ground)  
For a signal source connected  
to AI+ and AI– ........................... 30 V  
For a low-impedance source  
connected to AI+ and AI..........–6 to 30 V  
Input delay ........................................38.4/ fs + 3.2 μs  
NI 9234 Operating Instructions and Specifications 22  
ni.com  
 
Accuracy1  
Percent of  
Range*  
(Offset Error)  
Percent of  
Reading  
(Gain Error)  
Measurement Conditions  
Calibrated max (–40 to 70 °C)  
Calibrated typ (25 °C 5 °C)  
Uncalibrated max (–40 to 70 °C)  
Uncalibrated typ (25 °C 5 °C)  
* Range = 5.1 Vpk  
0.34%,  
0.03 dB  
0.14%,  
7.1 mV  
0.05%,  
0.005 dB  
0.006%,  
0.3 mV  
1.9%,  
0.16 dB  
0.27%,  
13.9 mV  
0.48%,  
0.04 dB  
0.04%,  
2.3 mV  
1
Refer to the NI 9234 Circuitry section for information regarding grounded signal  
sources and measurement accuracy.  
© National Instruments Corp.  
23 NI 9234 Operating Instructions and Specifications  
 
Gain drift  
Typical........................................0.14 mdB/°C (16 ppm/°C)  
Maximum ...................................0.45 mdB/°C (52 ppm/°C)  
Offset drift  
Typical........................................19.2 μV/°C  
Maximum ...................................118 μV/°C  
Channel-to-channel matching  
Gain  
Typical..................................0.01 dB  
Maximum.............................0.04 dB  
Phase ( fin in kHz) .......................fin · 0.045° + 0.04 max  
Passband  
Frequency...................................0.45 · fs  
Flatness (fs = 51.2 kS/s).............. 40 mdB (pk-to-pk max)  
Phase nonlinearity  
(fs = 51.2 kS/s) .................................. 0.45° max  
Stopband  
Frequency...................................0.55 · fs  
Rejection.....................................100 dB  
NI 9234 Operating Instructions and Specifications 24  
ni.com  
 
Alias-free bandwidth ........................0.45 · fs  
Oversample rate................................64 · fs  
Crosstalk (1 kHz)..............................110 dB  
CMRR (fin 1 kHz)  
Minimum....................................40 dB  
Typical........................................47 dB  
SFDR (fin = 1 kHz, –60 dBFS).........120 dB  
Idle channel noise and noise density  
Idle Channel  
51.2 kS/s  
97 dBFS  
25.6 kS/s  
99 dBFS  
2.048 kS/s  
103 dBFS  
25 μVrms  
Noise  
50 μVrms  
40 μVrms  
Noise density  
310 nV/Hz  
350 nV/Hz  
780 nV/Hz  
Input impedance  
Differential .................................305 kΩ  
AI– (shield) to chassis ground....50 Ω  
© National Instruments Corp.  
25 NI 9234 Operating Instructions and Specifications  
 
Total harmonic distortion (THD)  
Input  
Amplitude  
1 kHz  
8 kHz  
–87 dB  
–80 dB  
–1 dBFS  
–95 dB  
–95 dB  
–20 dBFS  
Intermodulation distortion (–1 dBFS)  
DIN 250 Hz/8 kHz  
4:1 amplitude ratio .....................80 dB  
CCIF 11 kHz/12 kHz  
1:1 amplitude ratio .....................93 dB  
MTBF ...............................................390,362 hours at 25 °C;  
Bellcore Issue 2, Method 1,  
Case 3, Limited Part Stress  
Method  
Note Contact NI for Bellcore MTBF specifications  
at other temperatures or for MIL-HDBK-217F  
specifications.  
NI 9234 Operating Instructions and Specifications 26  
ni.com  
 
Power Requirements  
Power consumption from chassis  
Active mode ...............................900 mW max  
Sleep mode .................................25 μW max  
Thermal dissipation (at 70 °C)  
Active mode ...............................930 mW max  
Sleep mode .................................25 μW max  
Physical Characteristics  
If you need to clean the module, wipe it with a dry towel.  
Weight...............................................173 g (6.1 oz)  
© National Instruments Corp.  
27 NI 9234 Operating Instructions and Specifications  
 
Safety  
Safety Voltages  
Connect only voltages that are within the following limits.  
Channel-to-earth ground................... 30 V max,  
Measurement Category I  
Isolation  
Channel-to-channel ....................None  
Channel-to-earth ground ............None  
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.  
Caution Do not connect the NI 9234 to signals or use for  
measurements within Measurement Categories II, III,  
or IV.  
NI 9234 Operating Instructions and Specifications 28  
ni.com  
 
Hazardous Locations  
U.S. (UL) ..........................................Class I, Division 2,  
Groups A, B, C, D, T4;  
Class I, Zone 2,  
AEx nA IIC T4  
Canada (C-UL) .................................Class I, Division 2,  
Groups A, B, C, D, T4;  
Class I, Zone 2,  
Ex nA IIC T4  
Europe (DEMKO).............................Ex nA IIC T4  
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  
Note For UL and other safety certifications, refer to the  
product label or the Online Product Certification section.  
© National Instruments Corp.  
29 NI 9234 Operating Instructions and Specifications  
 
Electromagnetic Compatibility  
This product meets the requirements of the following EMC  
standards for electrical equipment for measurement, control,  
and laboratory use:  
EN 61326 (IEC 61326): Class A emissions; Basic immunity  
EN 55011 (CISPR 11): Group 1, Class A emissions  
AS/NZS CISPR 11: Group 1, Class A emissions  
FCC 47 CFR Part 15B: Class A emissions  
ICES-001: Class A emissions  
Note For the standards applied to assess the EMC of this  
product, refer to the Online Product Certification section.  
Note For EMC compliance, operate this device with  
shielded cabling.  
NI 9234 Operating Instructions and Specifications 30  
ni.com  
 
CE Compliance  
This product meets the essential requirements of applicable  
European Directives as follows:  
2006/95/EC; Low-Voltage Directive (safety)  
2004/108/EC; Electromagnetic Compatibility Directive  
(EMC)  
Online Product Certification  
Refer to the product Declaration of Conformity (DoC) for  
additional regulatory compliance information. To obtain product  
certifications and the DoC for this product, visit ni.com/  
certification, search by module number or product line,  
and click the appropriate link in the Certification column.  
© National Instruments Corp.  
31 NI 9234 Operating Instructions and Specifications  
 
 
Shock and Vibration  
To meet these specifications, you must panel mount the system.  
Operating vibration  
Random (IEC 60068-2-64).........5 grms, 10 to 500 Hz  
Sinusoidal (IEC 60068-2-6) .......5 g, 10 to 500 Hz  
Operating shock  
(IEC 60068-2-27)..............................30 g, 11 ms half sine,  
50 g, 3 ms half sine,  
18 shocks at 6 orientations  
Environmental  
National Instruments C Series modules are intended for indoor use  
only but may be used outdoors if installed in a suitable enclosure.  
Refer to the manual for the chassis you are using for more  
information about meeting these specifications.  
Operating temperature  
(IEC 60068-2-1, IEC 60068-2-2) .....40 to 70 °C  
Storage temperature  
(IEC 60068-2-1, IEC 60068-2-2) .....40 to 85 °C  
Ingress protection..............................IP 40  
NI 9234 Operating Instructions and Specifications 32  
ni.com  
 
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  
Environmental Management  
NI is committed to designing and manufacturing products in an  
environmentally responsible manner. NI recognizes that  
eliminating certain hazardous substances from our products is  
beneficial to the environment and 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.  
© National Instruments Corp.  
33 NI 9234 Operating Instructions and Specifications  
 
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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ni.com/environment/rohs_chinaDŽ  
about China RoHS compliance, go to  
environment/rohs_china  
(For information  
ni.com/  
.)  
Calibration  
You can obtain the calibration certificate and information about  
calibration services for the NI 9234 at ni.com/calibration.  
Calibration interval ...........................1 year  
NI 9234 Operating Instructions and Specifications 34  
ni.com  
 
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 43 662 457990-0,  
Belgium 32 (0) 2 757 0020, Brazil 55 11 3262 3599,  
Canada 800 433 3488, China 86 21 5050 9800,  
Czech Republic 420 224 235 774, Denmark 45 45 76 26 00,  
Finland 358 (0) 9 725 72511, France 01 57 66 24 24,  
Germany 49 89 7413130, India 91 80 41190000,  
Israel 972 3 6393737, Italy 39 02 41309277, Japan 0120-527196,  
© National Instruments Corp.  
35 NI 9234 Operating Instructions and Specifications  
 
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 7 495 783 6851,  
Singapore 1800 226 5886, Slovenia 386 3 425 42 00,  
South Africa 27 0 11 805 8197, Spain 34 91 640 0085,  
Sweden 46 (0) 8 587 895 00, Switzerland 41 56 2005151,  
Taiwan 886 02 2377 2222, Thailand 662 278 6777,  
Turkey 90 212 279 3031, 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/technology, refer to the appropriate location: Help»Patents in  
your software, the patents.txt file on your media, or the National Instruments Patent Notice at  
ni.com/patents.  
© 2008 National Instruments Corp. All rights reserved.  
374238C-01  
Aug08  
 

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