National Instruments Network Card NI 9225E User Manual

OPERATING INSTRUCTIONS AND SPECIFICATIONS  
NI 9225E  
3-Channel, 300 Vrms, 24-Bit, Simultaneous,  
Channel-to-Channel Isolated Analog Input Module  
 
NI 9225E Dimensions  
The following figure shows the dimensions of the NI 9225E.  
73.4 (2.89)  
0.0 (0.00)  
Figure 1. NI 9225E Dimensions in Millimeters (Inches)  
© National Instruments Corp.  
3
NI 9225E Operating Instructions and Specifications  
 
Connecting the NI 9225E  
The NI 9225E has three 2-terminal detachable screw-terminal  
connectors that provide connections for three simultaneously  
sampled, isolated analog input channels.  
0
1
AI0+  
AI0–  
0
1
AI1+  
AI1–  
0
1
AI2+  
AI2–  
Figure 2. NI 9225E Terminal Assignments  
NI 9225E Operating Instructions and Specifications  
4
ni.com  
 
You can connect ground-referenced or floating signal sources to  
the NI 9225E. Connect the positive signal of the signal source to  
the AI+ terminal, and connect the negative signal of the signal  
source to the AI– terminal. If you make a ground-referenced  
connection between the signal source and the NI 9225E, 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 9225E. Refer to the Specifications section for more  
information about operating voltages and overvoltage protection.  
Note You must use 2-wire ferrules to create a secure  
connection when connecting more than one wire to a  
single terminal on the NI 9225E.  
Refer to Figures 3 and 4 for illustrations of how to connect  
grounded and floating signal sources to the NI 9225E.  
© National Instruments Corp.  
5
NI 9225E Operating Instructions and Specifications  
 
Signal  
Source  
AI+  
AI–  
+
NI 9225E  
Figure 3. Connecting a Grounded Signal Source to the NI 9225E  
Signal  
Source  
AI+  
+
AI–  
NI 9225E  
Figure 4. Connecting a Floating Signal Source to the NI 9225E  
NI 9225E Operating Instructions and Specifications  
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The NI 9225E 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.  
Each channel provides an independent signal path and ADC,  
enabling you to sample all three channels simultaneously. Refer to  
Figure 5 for an illustration of the circuitry for one channel of  
the NI 9225E.  
AI+  
Overvoltage  
ADC  
Protection  
AI–  
Amplifier Prefilter  
NI 9225E  
Figure 5. Input Circuitry for One Channel of the NI 9225E  
© National Instruments Corp.  
7
NI 9225E Operating Instructions and Specifications  
 
 
Understanding NI 9225E Filtering  
The NI 9225E 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 9225E 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 9225E 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 9225E.  
NI 9225E Operating Instructions and Specifications  
8
ni.com  
 
0.025  
0.000  
–0.025  
–0.050  
0
0.1  
0.2  
0.3  
0.4  
0.5  
Frequency/Data Rate  
Figure 6. Typical Passband Response of the NI 9225E  
© National Instruments Corp.  
9
NI 9225E Operating Instructions and Specifications  
 
 
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 9225E 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 9225E Data Rates  
The frequency of a master timebase (fM) controls the data rate (fs)  
of the NI 9225E. The NI 9225E 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 9225E with other  
modules that use master timebases to control sampling, all of the  
NI 9225E Operating Instructions and Specifications 10  
ni.com  
 
 
modules must share a single master timebase source. Refer to the  
software help for information about configuring the master  
timebase source for the NI 9225E. Visit ni.com/info and enter  
cseriesdoc for information about C Series documentation.  
The following equation provides the available data rates of the  
NI 9225E:  
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  
of 12.8 MHz, the result is data rates of 50 kS/s, 25 kS/s,  
16.667 kS/s, and so on down to 1.613 kS/s, depending on the value  
of n. When using an external timebase with a frequency other than  
12.8 MHz, the NI 9225E has a different set of data rates.  
Note The cRIO-9151 R Series Expansion chassis does  
not support sharing timebases between modules.  
© National Instruments Corp.  
11 NI 9225E Operating Instructions and Specifications  
 
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.  
NI 9225E Operating Instructions and Specifications 12  
ni.com  
 
Specifications  
The following specifications are typical for the range –40 to 85 °C  
unless otherwise noted. All voltages are relative to the AI– signal  
on each channel unless otherwise noted.  
Input Characteristics  
Number of channels..........................3 analog input channels  
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  
Data rate range (fs) using internal master timebase  
Minimum....................................1.613 kS/s  
Maximum ...................................50 kS/s  
© National Instruments Corp.  
13 NI 9225E Operating Instructions and Specifications  
 
 
Data rate range (fs) using external master timebase  
Minimum....................................390.6 S/s  
Maximum ...................................51.2 kS/s  
f
÷ 256  
n
--M------------------  
1
Data rates (fs)...................................  
, n = 1, 2, ..., 31  
Operating voltage ranges  
Minimum....................................294 Vrms  
Typical........................................300 Vrms  
Typical scaling coefficient ................50.66 μV/LSB  
Overvoltage protection ..................... 450 VDC  
Input coupling...................................DC  
Input impedance (AI+ to AI–)..........1 MΩ  
1
The data rate must remain within the appropriate data rate range. Refer to the  
Understanding NI 9225E Data Rates section for more information.  
NI 9225E Operating Instructions and Specifications 14  
ni.com  
 
Accuracy  
Percent of  
Range*  
(Offset Error)  
Percent of  
Reading  
(Gain Error)  
Measurement Conditions  
Calibrated max (–40 to 70 °C)  
Calibrated typ (25 °C, 5 °C)  
Calibrated max (25 °C, 15 °C)  
Uncalibrated max (–40 to 70 °C)  
Uncalibrated typ (25 °C, 5 °C)  
* Range equals 425 V.  
0.23%  
0.05%  
0.084%  
1.6%  
0.05%  
0.008%  
0.016%  
0.66%  
0.09%  
0.4%  
Input noise ........................................2 mVrms  
Stability  
Gain drift .................................... 10 ppm/°C  
Offset drift.................................. 970 μV/°C  
Post calibration gain match  
(ch-to-ch, 20 kHz)............................. 0.25 dB max  
© National Instruments Corp.  
15 NI 9225E Operating Instructions and Specifications  
 
Crosstalk (60 Hz)..............................130 dB  
Phase match  
Ch-to-ch, max.............................0.035°/kHz  
Module-to-module, max.............0.035°/kHz + 360° · fin/fM  
Phase linearity (fs = 50 kS/s).............0.22° max  
Input delay ........................................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 bandwidth (fs = 50 kS/s).........24.56 kHz  
CMRR (fin = 60 Hz)..........................104 dB  
SFDR (1 kHz, –60 dB) .....................128 dB  
NI 9225E Operating Instructions and Specifications 16  
ni.com  
 
Total Harmonic Distortion (THD)  
(1 kHz, –20 dB) ................................95 dB  
MTBF ...............................................301,606 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.  
Power Requirements  
Power consumption from chassis  
Active mode ...............................495 mW max  
Sleep mode .................................25 μW max  
Thermal dissipation (at 70 °C)  
Active mode ...............................760 mW max  
Sleep mode .................................265 mW max  
© National Instruments Corp.  
17 NI 9225E Operating Instructions and Specifications  
 
Physical Characteristics  
If you need to clean the module, wipe it with a dry towel.  
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...............................................43 g (1.5 oz)  
Safety  
Maximum Voltage  
Connect only voltages that are within the following limits.  
AI+ to AI– ........................................300 Vrms max  
NI 9225E Operating Instructions and Specifications 18  
ni.com  
 
Isolation Voltages  
Channel-to-channel  
Continuous .................................600 Vrms  
,
Measurement Category II,  
(Basic insulation)  
Withstand....................................2,300 Vrms, verified by a 5 s  
dielectric withstand test  
Channel-to-earth ground  
Continuous .................................300 Vrms  
,
Measurement Category II,  
(Double insulation)  
Withstand....................................2,300 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.  
Caution Do not connect the NI 9225E to signals or use for  
measurements within Measurement Categories III or IV.  
© National Instruments Corp.  
19 NI 9225E Operating Instructions and Specifications  
 
Safety Standards  
This product meets the requirements of the following standards of  
safety for electrical equipment for measurement, control, and  
laboratory use when installed in a suitable enclosure:  
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.  
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.  
NI 9225E Operating Instructions and Specifications 20  
ni.com  
 
 
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 85 °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  
© National Instruments Corp.  
21 NI 9225E Operating Instructions and Specifications  
 
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.  
Waste Electrical and Electronic Equipment (WEEE)  
EU Customers At the end of the 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.  
NI 9225E Operating Instructions and Specifications 22  
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about China RoHS compliance, go to  
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ni.com/  
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Calibration  
You can obtain the calibration certificate and information about  
calibration services for the NI 9225E at ni.com/calibration.  
Calibration interval ...........................1 year  
© National Instruments Corp.  
23 NI 9225E Operating Instructions 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.  
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,  
NI 9225E Operating Instructions and Specifications 24  
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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 media, or ni.com/patents.  
© 2008 National Instruments Corp. All rights reserved.  
372618A-01  
Jul08  
 

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