National Instruments Network Card NI USB 9234 User Manual

USER GUIDE AND SPECIFICATIONS  
NI USB-9234  
4-Channel, 5 V, 24-Bit Software-Selectable IEPE and AC/DC  
Analog Input Module  
This user guide describes how to use the National Instruments USB-9234  
and includes device specifications and connector assignments.  
Introduction  
The NI USB-9234 consists of two components: an NI 9234 module and an  
NI USB-9162 carrier, as shown in Figure 1.  
NI 9234  
H i -  
S p e e d  
N
I
U
S B U S B C a r r i e r  
- 9 1  
6 2  
NI USB-9162  
H I -  
S p e e d U S B  
N
I
U
S B  
- 9 1  
6 2  
C a r r i e r  
NI USB-9234  
Figure 1. NI USB-9234 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.  
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 8.8 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-DAQmx. Select Start»All Programs»National Instruments»  
NI-DAQ»NI-DAQ Readme.  
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.  
© National Instruments Corporation  
3
NI USB-9234 User Guide and Specifications  
 
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  
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-9234 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.  
© National Instruments Corporation  
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NI USB-9234 User Guide and Specifications  
 
.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.  
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»All 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  
Documentation for supported devices and accessories, including PDF  
and help files describing device terminals, specifications, features, and  
operation are on the NI-DAQmx CD that includes Device Documentation.  
Insert the CD, open the Device Documentation directory, and double-click  
the Device Documents shortcut for your language to find, view, and print  
device documents.  
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.  
NI USB-9234 User Guide and Specifications  
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Installing the Software  
Software support for the NI USB-9234 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.  
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-9234. Refer to the NI-DAQmx for  
USB Devices Getting Started Guide that shipped with your device, which  
is also accessible from Start»All Programs»National Instruments»  
NI-DAQ for more information.  
Installing the NI USB-9234 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 9234 in the NI USB-9162 Carrier  
The NI 9234 module and NI USB-9162 carrier are packaged separately.  
Refer to Figure 3, while completing the following assembly steps:  
1. Make sure no signals are connected to the NI 9234 module and the  
USB cable is not connected to the device.  
2. Remove the protective cover from the 15-pin D-SUB connector.  
© National Instruments Corporation  
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NI USB-9234 User Guide and Specifications  
 
 
3. Align the I/O module with the carrier, as shown in Figure 3.  
H i - S p e e d U S  
N I U S B - 9 1 6 2  
B C a r r i e r  
Figure 3. Module Installation  
4. Squeeze the latches and insert the NI 9234 module into the  
NI USB-9162 carrier.  
5. Press firmly on the connector side of the NI 9234 module until the  
latches lock the module into place, as shown in Figure 4.  
H i - S p e e d U S B  
N I U S B - 9 1 6 2  
C a r r i e r  
Figure 4. Locking Module into Place  
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Mounting the NI USB-9234  
Threaded inserts are located in the NI USB-9234 for mounting it to a panel.  
Refer to Figure 5 for the module 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 NI USB-9234 to a Computer  
Plug one end of the USB cable into the NI USB-9234 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, which is also  
accessible from Start»All Programs»National Instruments»NI-DAQ,  
for more information.  
© National Instruments Corporation  
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NI USB-9234 User Guide and Specifications  
 
 
LED Indicator  
The NI USB-9234 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 your device is not blinking, make sure your computer has the latest  
version of NI-DAQmx installed on it, and that the computer is not in  
standby mode.  
Table 1. LED State/Device Status  
LED State  
Device Status  
Device not connected or in suspend.  
Device connected, but no module installed.  
Operating normally.  
Not lit  
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.  
NI USB-9234 User Guide and Specifications  
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Wiring the NI USB-9234  
The NI USB-9234 has four BNC connectors that provide connections to  
four simultaneously sampled analog input channels. 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  
Electronic Piezoelectric (IEPE) sensors. The center pin of the connector,  
AI+, provides the DC signal connection. The shell of the connector, AI–,  
provides the excitation return path and AC signal ground reference. Refer  
to Figure 6 for the connector assignments for each channel.  
AI0+  
AI0–  
AI1+  
AI1–  
AI2+  
AI2–  
AI3+  
AI3–  
Figure 6. NI USB-9234 Connector Assignments  
© National Instruments Corporation  
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NI USB-9234 User Guide and Specifications  
 
 
Connecting Signal Sources to the NI USB-9234  
You can connect ground-referenced or floating signal sensors to the  
NI USB-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 touching each other, the modules, or the chassis.  
If you make a ground-referenced connection between the signal source and  
the NI USB-9234, make sure the voltage on the AI– shell is in the  
common-mode range to ensure proper operation of the NI USB-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.  
Figures 7 and 8 illustrate connecting grounded and floating signal sources  
to the NI USB-9234.  
Signal  
Source  
AI+  
AI–  
+
NI USB-9234  
Common-  
Mode  
Voltage  
Figure 7. Connecting a Grounded IEPE Sensor to the NI USB-9234  
Signal  
Source  
AI+  
AI–  
+
NI USB-9234  
Figure 8. Connecting a Floating IEPE Sensor to the NI USB-9234  
The NI USB-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 USB-9234 results in a  
floating connection even though the case of the sensor is grounded.  
NI USB-9234 User Guide and Specifications  
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NI USB-9234 Circuitry  
The NI USB-9234 analog input channels are referenced to chassis ground  
through a 50 Ω resistor. To minimize ground noise, make sure that the  
chassis ground is connected to earth ground. Each channel is protected  
from overvoltages. You can configure the NI USB-9234 for AC or DC  
coupling for each channel. You can turn the IEPE excitation current on or  
off in AC-coupled mode (in software). IEPE current is not available in  
DC-coupled mode. The input signal on each channel is buffered,  
conditioned, and then sampled by a 24-bit, Delta-Sigma ADC.  
2 mA IEPE On/Off  
AC/DC Coupling  
AI+  
AI–  
+
ADC  
Current-  
Limiting  
Diodes  
50 Ω  
Common-  
Mode  
Amplifier  
and  
Prefilter  
Bias  
Current  
NI USB-9234  
Figure 9. Input Circuitry for One Channel  
The NI USB-9234 uses common-mode bias current to bias the  
current-limiting diodes when IEPE current is turned off. When 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.  
Signal  
Source  
AI+  
AI–  
NI USB-9234  
+
Common-  
Mode  
AI– Lead  
Impedance  
Bias  
Current  
Figure 10. Measurement Error Introduced by Common-Mode Bias Current  
© National Instruments Corporation  
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NI USB-9234 User Guide and Specifications  
 
 
The NI USB-9234 also has TEDS circuitry. For more information about  
TEDS, go to ni.com/info and enter rdteds.  
Understanding NI USB-9234 Filtering  
The NI USB-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 USB-9234 represents signals within the passband as quantified  
primarily by passband flatness and phase nonlinearity. The filters reject  
frequencies within the stopband as much as possible, as quantified by  
stopband rejection. 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 frequency is called  
the passband flatness. The digital filters of the NI USB-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 11 shows typical passband flatness for 51.2 kS/s data rate.  
0.025  
0.000  
–0.025  
–0.050  
0
5
10  
15  
20  
25  
30  
Frequency (kHz)  
Figure 11. NI USB-9234 Typical Passband Response  
NI USB-9234 User Guide and Specifications  
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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 USB-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.  
Understanding NI USB-9234 Data Rates  
The frequency of a master timebase (fM) controls the data rate (fs) of the  
NI USB-9234. The NI USB-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. Refer to the  
software help for information about configuring the master timebase source  
for the NI USB-9234.  
The following equation provides the available data rates of the  
NI USB-9234:  
(fM) ÷ 256  
------------------------  
fs =  
n
where n is any integer from 1 to 31.  
The data rate must remain within the data range. Refer to the Specifications  
section for more information about the data rate range. When using the  
internal master timebase 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 USB-9234 has a different set of data rates.  
© National Instruments Corporation  
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NI USB-9234 User Guide and Specifications  
 
Specifications  
The following specifications are typical for the range 0 to 60 °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  
(interface)  
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  
Data rate range (fs) using external master timebase  
Minimum.........................................0.391 kS/s  
Maximum ........................................52.734 kS/s  
fM ÷ 256  
--------------------  
Data rates (fs) ..........................................  
, n = 1, 2, …, 31  
n
Input coupling.........................................AC/DC (software-selectable)  
AC cutoff frequency  
–3 dB ...............................................0.5 Hz typ  
–0.1 dB............................................4.6 Hz max  
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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)  
Input range ............................................. 5 V  
AC voltage full-scale range  
Minimum ........................................ 5 Vpk  
Typical ............................................ 5.1 Vpk  
Maximum........................................ 5.2 Vpk  
Common-mode voltage  
(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 mA for 10 ms  
IEPE compliance voltage....................... 19 V max  
If you are using an IEPE sensor, use the following equation to make sure  
that 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 of the  
NI USB-9234,  
Vbias is the bias voltage of the IEPE sensor,  
Vfull-scale is the full-scale voltage of IEPE sensor  
© National Instruments Corporation  
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NI USB-9234 User Guide and Specifications  
 
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 ..............................................3.2 ms + 38.4 fs  
Accuracy1  
Percent of Reading  
(Gain Error)  
Percent of Range*  
(Offset Error)  
Measurement Conditions  
Calibrated max (–40 to 70 °C)  
0.34%,  
0.03 dB  
0.14%,  
7.1 mV  
Calibrated typ (25 °C 5 °C)  
Uncalibrated max (–40 to 70 °C)  
Uncalibrated typ (25 °C 5 °C)  
* Range = 5.1 Vpk  
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  
Gain drift  
Typical.............................................0.14 mdB/°C (16 ppm/°C)  
Maximum ........................................0.45 mdB/°C (52 ppm/°C)  
Offset drift  
Typical.............................................19.2 mV/°C  
Maximum ........................................118 mV/°C  
Channel-to-channel matching  
Gain  
Typical......................................0.01 dB  
Maximum .................................0.04 dB  
Phase ( fin in kHz) ............................fin · 0.045° + 0.04 max  
Frequency ........................................0.45 · fs  
Flatness (fs = 51.2 kS/s)................... 40 mdB  
(pk-to-pk max)  
1
Refer to the NI USB-9234 Circuitry section for information regarding grounded signal sources and measurement accuracy.  
NI USB-9234 User Guide and Specifications  
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Phase nonlinearity  
(fs = 51.2 kS/s) ................................ 0.45° max  
Stopband  
Frequency........................................ 0.55 · fs  
Rejection ......................................... 100 dB  
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  
Total harmonic distortion (THD)  
Input  
1 kHz,  
8 kHz,  
Amplitude  
–40 to 70 °C  
–40 to 70 °C  
–1 dBFS  
–95 dB  
–95 dB  
–87 dB  
–80 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  
© National Instruments Corporation  
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NI USB-9234 User Guide and Specifications  
 
Power Requirements  
Current consumption from USB.............500 mA, max  
Suspend mode..................................2.5 mA, max  
Bus Interface  
USB specification ...................................USB 2.0 Hi-Speed  
Physical Characteristics  
Dimensions .............................................12.1 cm × 8.6 cm × 2.5 cm  
(4.75 in. × 3.37 in. × 0.99 in.)  
Weight ....................................................Approx. 250 g (8.8 oz)  
Safety  
If you need to clean the module, wipe it with a dry towel.  
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..........................No isolation between channels  
Channel-to-earth ground..................No isolation between channels  
and earth ground  
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 USB-9234 to signals or use for measurements within  
Measurement Categories II, III, or IV.  
NI USB-9234 User Guide and Specifications  
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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 model number or product line, and click the appropriate link  
in the Certification column.  
Hazardous Locations  
The NI USB-9234 is not certified for use in hazardous locations.  
Environmental  
The NI USB-9234 device is intended for indoor use only.  
Operating temperature............................ 0 to 60 °C  
Storage temperature ............................... –40 to 85 °C  
Ingress protection................................... IP 40  
Operating humidity  
(IEC 60068-2-56)................................... 10 to 90% RH, noncondensing  
Storage humidity  
(IEC 6008-2-56)..................................... 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; Minimum 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.  
© National Instruments Corporation  
21  
NI USB-9234 User Guide and Specifications  
 
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/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 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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National Instruments  
(RoHS)  
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RoHS  
ni.com/environment/rohs_china  
(For information about China RoHS compliance, go to  
.)  
Calibration  
You can obtain the calibration certificate and information about calibration  
services for the NI USB-9234 at ni.com/calibration.  
Calibration interval.................................1 year  
NI USB-9234 User Guide and Specifications  
22  
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, 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, refer to the  
appropriate location: Help»Patents in your software, the patents.txt file on your CD, or  
ni.com/patents.  
© 2008 National Instruments Corporation. All rights reserved.  
372307A-01  
May08  
 

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