National Instruments Network Card NI 9235 User Manual

OPERATING INSTRUCTIONS AND SPECIFICATIONS  
NI 9235/9236  
8-Channel, 24-Bit Quarter-Bridge Analog Input  
Module  
Français Deutsch  
ni.com/manuals  
 
Safety Guidelines  
Operate the NI 9235/9236 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 9235/9236 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 9235/9236 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.  
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NI9235/9236  
 
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 9235/9236 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 9235/9236  
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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.  
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NI9235/9236  
 
Connecting the NI 9235/9236  
The NI 9235/9236 has a 24-terminal detachable spring-terminal  
connector that provides connections for 8 analog input channels.  
EXC0  
AI0  
RC0  
EXC2  
AI2  
RC2  
EXC4  
AI4  
RC4  
EXC6  
AI6  
1
2
3
4
5
6
7
8
9
13  
14  
15  
16  
17  
18  
19  
20  
21  
EXC1  
AI1  
RC1  
EXC3  
AI3  
RC3  
EXC5  
AI5  
RC5  
EXC7  
AI7  
10 22  
11 23  
12 24  
RC6  
RC7  
Figure 1. NI 9235/9236 Terminal Assignments  
NI 9235/9236  
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You can connect a quarter-bridge sensor to each channel. Each  
channel has an EXC terminal that provides the excitation voltage  
stimulus, an AI terminal that measures the bridge voltage, and an  
RC terminal that provides the quarter-bridge completion. Refer to  
Figure 2 for an illustration of how to connect quarter-bridge  
sensors to the NI 9235/9236.  
EXC*  
AI**  
RC*  
NI 9235/9236  
* For best system accuracy, set up the connections to EXC and RC with  
equal lengths of an identical wire type and gauge.  
** For best system accuracy, set up the connection to AI directly at the  
sensor instead of shorting AI to RC directly at the terminals.  
Figure 2. Quarter-Bridge Connections for the NI 9235/9236  
© National Instruments Corp.  
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NI9235/9236  
 
 
Connecting Wires to the NI 9235/9236 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.  
Figure 3. Connecting Wires to the NI 9235/9236 Connector  
NI 9235/9236  
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Wiring for High-Vibration Applications  
If an application is subject to high vibration, National Instruments  
recommends that you use the NI 9965 backshell kit to protect the  
connections. Refer to Figure 4 for an illustration of the NI 9965  
connector backshell.  
Figure 4. NI 9965 Connector Backshell  
© National Instruments Corp.  
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NI9235/9236  
 
 
NI 9235/9236 Circuitry  
The NI 9235/9236 is isolated from earth ground. However, the  
individual channels are not isolated from each other. The EXC  
terminals all connect internally to a common excitation supply.  
You must connect each EXC terminal to only one gage to maintain  
the channel-to-channel crosstalk performance of the module.  
Each channel on the NI 9235/9236 has an independent 24-bit ADC  
and input amplifier that enables you to sample signals from all  
eight channels simultaneously. Refer to Figures 5 and 6 for  
illustrations of the input circuitry for one channel of the  
NI 9235/9236.  
NI 9235/9236  
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EXC  
AI  
2.0 V  
Bridge  
Excitation  
+
+
ADC  
Filtered  
Differential  
Amplifier  
RC  
120 Ω  
50 kΩ  
Bridge  
Shunt  
Completion Resistor  
Resistor  
NI 9235  
Figure 5. Input Circuitry for One Channel of the NI 9235  
© National Instruments Corp.  
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NI9235/9236  
 
 
EXC  
AI  
3.3 V  
Bridge  
Excitation  
+
+
ADC  
Filtered  
Differential  
Amplifier  
RC  
350 Ω  
100 kΩ  
Bridge  
Shunt  
Completion Resistor  
Resistor  
NI 9236  
Figure 6. Input Circuitry for One Channel of the NI 9236  
The NI 9235/9236 also includes filters to prevent aliasing. The  
filters on the NI 9235/9236 filter according to the sampling rate.  
Refer to the Understanding NI 9235/9236 Filtering section for  
more information about filtering.  
NI 9235/9236  
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Quarter-bridge measurements are inherently sensitive to accuracy  
degradation due to the lead resistance of wiring from the sensor to  
the measurement device. For a given change in the gage resistance,  
the total effective resistance changes slightly less. Accordingly, the  
measured mV/V reading is less than its true value. However, you  
can use shunt calibration to quantify the lead wire desensitization,  
and can then design the software application to correct subsequent  
readings for this gain error. The gain error caused by a lead wire  
equals RL/RG, where RL is the lead wire resistance, and RG is the  
quarter-bridge completion resistance.  
Shunt Calibration  
The NI 9235/9236 shunt calibration circuitry consists of a  
precision resistor and a software-controlled switch, connected  
across the internal quarter-bridge completion resistor. Refer to the  
software help for information about enabling the shunt calibration  
switch for the NI 9235/9236. Each input channel has a unique  
shunt calibration resistor that can operate independently, as shown  
in Figures 5 and 6.  
© National Instruments Corp.  
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NI9235/9236  
 
Shunt calibration simulates strain input by changing the resistance  
of an arm in the bridge by a known amount. By shunting, or  
connecting, a large resistor across one arm of the bridge, a specific  
change occurs in the bridge voltage ratio. With the connected  
sensor in a stable, typically unloaded, state, you can measure the  
output of the bridge before and after the shunt calibration. You can  
compare the measured reading change to the shunt calibration  
output value to verify system setup or compensate for  
quarter-bridge lead wire desensitization error. Refer to the  
Specifications section for the shunt calibration output value. Visit  
ni.com/info and enter lwcomp for information about lead wire  
compensation.  
Excitation Voltage  
The NI 9235/9236 provides a constant excitation supply voltage to  
each channel. The excitation supply provides sufficient output  
current to power all eight channels at minimum resistance.  
The excitation supply retains regulation even if one channel  
experiences a gage short. If more than one channel has a gage  
short, the excitation supply enters a current limit state and the  
excitation voltage falls accordingly.  
NI 9235/9236  
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Understanding NI 9235/9236 Filtering  
The NI 9235/9236 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 9235/9236 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 9235/9236 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 7 shows typical  
passband flatness for the 10 kS/s data rate.  
© National Instruments Corp.  
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NI9235/9236  
 
 
0.025  
0.000  
–0.025  
–0.050  
0
1
2
3
4
5
Frequency (kHz)  
Figure 7. Typical Passband Response for the NI 9235/9236  
NI 9235/9236  
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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 9235/9236 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.  
Understanding NI 9235/9236 Data Rates  
The frequency of a master timebase (fM) controls the data rate (fs)  
of the NI 9235/9236. The NI 9235/9236 includes an internal master  
timebase with a frequency of 12.8 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 9235/9236 with  
other modules that use master timebases to control sampling, all of  
© National Instruments Corp.  
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NI9235/9236  
 
 
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 9235/9236. Visit ni.com/info and  
enter cseriesdoc for information about C Series documentation.  
The following equation provides the available data rates of the  
NI 9235/9236:  
f
÷ 256  
n
--M------------------  
fs =  
where n is any integer in the set {2; 4, 5, ..., 63}.  
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  
of 12.8 MHz, the result is data rates of 10 kS/s, 8.333 kS/s,  
7.143 kS/s, and so on down to 794 S/s, depending on the value of  
n. When using an external timebase with a frequency other than  
12.8 MHz, the NI 9235/9236 has a different set of data rates.  
Note The cRIO-9151 R Series Expansion chassis does  
not support sharing timebases between modules.  
NI 9235/9236  
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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.  
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NI9235/9236  
 
Specifications  
The following specifications are typical for the range –40 to 70 °C  
unless otherwise noted. The specifications are the same for the  
NI 9235 and the NI 9236 unless otherwise noted.  
Input Characteristics  
Number of channels..........................8 analog input channels  
Quarter-bridge completion  
NI 9235.......................................120 Ω, 10 ppm/°C max  
NI 9236.......................................350 Ω, 10 ppm/°C max  
ADC resolution.................................24 bits  
Type of ADC.....................................Delta-Sigma (with analog  
prefiltering)  
Sampling mode.................................Simultaneous  
Internal master timebase (fM)  
Frequency...................................12.8 MHz  
Accuracy..................................... 100 ppm max  
NI 9235/9236  
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Data rate range (fs) using internal master timebase  
Minimum....................................794 S/s  
Maximum ...................................10 kS/s  
Data rate range (fs) using external master timebase  
Minimum....................................195.3125 S/s  
Maximum ...................................10.547 kS/s  
f
÷ 256  
n
--M------------------  
1
Data rates (fs).....................................  
, n = {2; 4, 5, ..., 63}  
Full-scale range................................. 29.4 mV/V  
(+62,500 με/–55,500 με)  
Scaling coefficient ............................3.5062 nV/V per LSB  
Overvoltage protection  
between any two terminals ............... 30 V  
1
The data rate must remain within the appropriate data rate range. Refer to the  
Understanding NI 9235/9236 Data Rates section for more information.  
© National Instruments Corp.  
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NI9235/9236  
 
Accuracy, NI 9235  
Percent of Range†,  
(Offset Error)  
Percent of  
Reading*  
30 days  
after cal. after cal.  
1 year  
Measurement Conditions  
Calibrated typ (25 °C, 5 °C)  
Calibrated max (–40 to 70 °C)  
Uncalibrated typ (25 °C, 5 °C)  
Uncalibrated max (–40 to 70 °C)  
(Gain Error) ( 5 °C)  
( 5 °C)  
0.15%  
0.4%  
0.02%  
0.07%  
0.15%  
0.53%  
0.1%  
0.17%  
1.25%  
2.14%  
* Exclusive of lead wire desensitization error.  
Range equals 29.4 mV/V.  
Calibrated errors represent offset stability following unstrained  
measurement. Errors include the effect of completion resistor tolerance  
and drift.  
Stability, NI 9235  
Gain drift..............................6 ppm/°C  
Offset drift............................2.2 μV/V/°C  
NI 9235/9236  
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Accuracy, NI 9236  
Percent of Range†,  
(Offset Error)  
Percent of  
Reading*  
30 days  
after cal. after cal.  
1 year  
Measurement Conditions  
Calibrated typ (25 °C, 5 °C)  
Calibrated max (–40 to 70 °C)  
Uncalibrated typ (25 °C, 5 °C)  
Uncalibrated max (–40 to 70 °C)  
(Gain Error) ( 5 °C)  
( 5 °C)  
0.14%  
0.39%  
0.02%  
0.07%  
0.15%  
0.53%  
0.08%  
0.16%  
0.79%  
1.67%  
* Exclusive of lead wire desensitization error.  
Range equals 29.4 mV/V.  
Calibrated errors represent offset stability following unstrained  
measurement. Errors include the effect of completion resistor tolerance  
and drift.  
Stability, NI 9236  
Gain drift..............................6 ppm/°C  
Offset drift............................1.7 μV/V/°C  
© National Instruments Corp.  
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NI9235/9236  
 
Channel-to-channel matching (calibrated)  
Input Signal  
Frequency  
(fin)  
Gain  
Maximum  
Phase  
Typical  
0.08%  
0.17%  
Maximum  
0 to 1 kHz  
0 to 4 kHz  
0.11%  
0.32%  
0.34°/kHz · fin  
Phase nonlinearity  
fin = 0 to 1 kHz............................ 0.002°  
fin = 0 to 4 kHz............................ 0.1°  
Input delay ........................................38.2/fs + 11 μs  
Passband  
Frequency...................................0.45 · fs  
Flatness (fs = 10 kS/s).................33 mdB max  
Stopband  
Frequency...................................0.55 · fs  
Rejection.....................................100 dB  
NI 9235/9236  
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Alias-free bandwidth ........................0.45 · fs  
Oversample rate................................64 · fs  
Rejection at oversample rate1  
(fs = 10 kS/s) .....................................80 dB @ 640 kHz  
Input noise  
fs = 1 kS/s  
NI 9235 ................................0.38 μV/Vrms  
NI 9236 ................................0.25 μV/Vrms  
fs = 10 kS/s  
NI 9235 ................................0.85 μV/Vrms  
NI 9236 ................................0.5 μV/Vrms  
SFDR (1 kHz, –60 dBFS)  
NI 9235.......................................110 dB  
NI 9236.......................................115 dB  
THD (1 kHz, –20 dBFS)  
NI 9235.......................................90 dB  
NI 9236.......................................95 dB  
1
Rejection by analog prefilter of signal frequencies at oversample rate.  
© National Instruments Corp.  
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NI9235/9236  
 
Crosstalk (fin = 1 kHz) ......................100 dB  
Common-mode voltage,  
all signals to earth ground................. 60 VDC  
CMRR (fin = 0 to 60 Hz)  
NI 9235.......................................120 dB  
NI 9236.......................................110 dB  
MTBF ...............................................566,796 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 9235/9236  
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Shunt Calibration Characteristics  
Shunt calibration accuracy  
NI 9235  
NI 9236  
Measurement  
Conditions  
Percent of Reading Percent of Reading  
(Gain Error)  
(Gain Error)  
Typical (25 °C, 5 °C)  
0.09%  
0.07%  
Maximum (–40 to 70 °C)  
0.22%  
0.2%  
Resistance  
NI 9235.......................................50 kΩ  
NI 9236.......................................100 kΩ  
Output value  
NI 9235.......................................599.28 μV/V  
NI 9236.......................................873.47 μV/V  
Temperature drift ..............................15 ppm/°C  
Method..............................................Shunt across completion  
resistor  
© National Instruments Corp.  
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NI9235/9236  
 
Excitation Characteristics  
Excitation type..................................Constant voltage  
Excitation value  
NI 9235.......................................2.0 V 1%  
NI 9236.......................................3.3 V 1%  
Maximum output current  
NI 9235.......................................80 mA  
NI 9236.......................................46 mA  
Power Requirements  
Power consumption from chassis  
NI 9235  
Active mode.........................735 mW max  
Sleep mode...........................25 μW max  
NI 9236  
Active mode.........................675 mW max  
Sleep mode...........................25 μW max  
NI 9235/9236  
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Thermal dissipation (at 70 °C)  
NI 9235  
Active mode.........................735 mW max  
Sleep mode...........................25 μW max  
NI 9236  
Active mode.........................675 mW max  
Sleep mode...........................25 μW max  
Physical Characteristics  
If you need to clean the module, wipe it with a dry towel.  
Spring-terminal wiring......................18 to 28 AWG copper  
conductor wire with 7 mm  
(0.28 in.) of insulation  
stripped from the end  
Weight...............................................153 g (5.4 oz)  
Safety  
Safety Voltages  
Connect only voltages that are within the following limits.  
Between any two terminals............... 30 V max  
© National Instruments Corp.  
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NI9235/9236  
 
Isolation  
Channel-to-channel ....................None  
Channel-to-earth ground  
Continuous...........................60 VDC,  
Measurement Category I  
Withstand .............................1,000 Vrms, verified by a 5 s  
dielectric withstand test  
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 9235/9236 to signals or  
use for measurements within Measurement Categories II,  
III, or IV.  
NI 9235/9236  
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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 visit ni.com/certification, search  
by module number or product line, and click the  
appropriate link in the Certification column.  
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  
© National Instruments Corp.  
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NI9235/9236  
 
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  
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  
NI 9235/9236  
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Shock and Vibration  
To meet these specifications, you must panel mount the system and  
use the NI 9965 backshell to protect the connections.  
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  
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  
© National Instruments Corp.  
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NI9235/9236  
 
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 markings, as follows:  
2006/95/EC; Low-Voltage Directive (safety)  
2004/108/EC; 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 module 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.  
NI 9235/9236  
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ni.com  
 
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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© National Instruments Corp.  
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NI9235/9236  
 
Calibration  
You can obtain the calibration certificate and information about  
calibration services for the NI 9235/9236 at ni.com/  
calibration.  
Calibration interval ...........................1 year  
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  
NI 9235/9236  
36  
ni.com  
 
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,  
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 Corp.  
37  
NI9235/9236  
 
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 media, or ni.com/patents.  
© 2008 National Instruments Corp. All rights reserved.  
374645A-01  
Jun08  
 

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