National Instruments NI 9225 Specifications

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OPERATING INSTRUCTIONS AND SPECIFICATIONS
ni.com/manuals
NI 9225
3-Channel, 300 V
, 24-Bit Simultaneous,
rms
Channel-to-Channel Isolated Analog Input Module
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This document describes how to use the National Instruments 9225 and includes specifications and pin assignments for the NI 9225.
Note The safety guidelines and specifications in this
document are specific to the NI 9225. The other components in the system might not meet the same safety ratings and specifications. Refer to the documentation for each component in the system to determine the safety ratings and specifications for the entire system.
Related Information
NI CompactDAQ & NI CompactRIO Documentation
ni.com/info cseriesdoc
Software Support
ni.com/info  softwareversion
2 | ni.com | NI 9225 Operating Instructions and Specifications
Chassis Compatibility
ni.com/info  compatibility
Services
ni.com/services
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Safety Guidelines
Operate the NI 9225 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.
Hazardous Voltage This icon denotes a warning
advising you to take precautions to avoid electrical shock.
Caution Do not operate the NI 9242 in a manner not
specified in this manual. Product misuse can result in a hazard. You can compromise the safety protection built into the product if the product is damaged in any way. If the product is damaged, return it to National Instruments for repair.
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 V
NI 9225 Operating Instructions and Specifications | © National Instruments | 3
or 60 VDC to earth ground.
pk
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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.
Caution When module terminals are hazardous voltage
LIVE (>42.4 V
/60 VDC), you must ensure that devices
pk
and circuits connected to the module are properly insulated from human contact. You must use the NI 9971 connector backshell kit to ensure that the terminals are not accessible.
4 | ni.com | NI 9225 Operating Instructions and Specifications
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Figure 1 shows the NI 9971 connector backshell.
Figure 1. NI 9971 Connector Backshell
NI 9225 Operating Instructions and Specifications | © National Instruments | 5
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Safety Guidelines for Hazardous Locations
The NI 9225 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 9225 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.
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.
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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.
NI 9225 Operating Instructions and Specifications | © National Instruments | 7
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Connecting the NI 9225
The NI 9225 has three 2-terminal detachable screw-terminal connectors that provide connections for three simultaneously sampled, isolated analog input channels.
Figure 2. NI 9225 Terminal Assignments
AI0+ AI0–
AI1+ AI1–
AI2+ AI2–
0 1
0 1
0 1
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You can connect ground-referenced or floating signal sources to the NI 9225. 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 9225, 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 9225. 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 9225.
NI 9225 Operating Instructions and Specifications | © National Instruments | 9
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Refer to Figures 3 and 4 for illustrations of how to connect
NI 9225
Signal
Source
AI–
+
AI+
NI 9225
Signal
Source
AI–
+
AI+
grounded and floating signal sources to the NI 9225.
Figure 3. Connecting a Grounded Signal Source to the NI 9225
Figure 4. Connecting a Floating Signal Source to the NI 9225
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The NI 9225 analog input channels are floating with respect to
NI 9225
AI+
AI–
ADC
Amplifier
Overvoltage
Protection
Prefilter
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 9225.
Figure 5. Input Circuitry for One Channel of the NI 9225
NI 9225 Operating Instructions and Specifications | © National Instruments | 11
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Wiring for High-Vibration Applications
If an application is subject to high vibration, National Instruments recommends that you either use ferrules to terminate wires to the detachable screw-terminal connector or use the NI 9971 backshell kit to protect the connections. Refer to Figure 6 for an illustration of using ferrules. Refer to Figure 1 for an illustration of the NI 9971 connector backshell.
Figure 6. 2-Terminal Detachable Screw-Terminal Connector with Ferrule
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Understanding NI 9225 Filtering
The NI 9225 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 9225 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 9225 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 NI 9225.
NI 9225 Operating Instructions and Specifications | © National Instruments | 13
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Figure 7. Typical Passband Response of the NI 9225
0.025
0.000
Gain (dB)
–0.025
–0.050
0.30.20.10
Frequency/Data Rate (Hz)
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0.50.4
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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 9225 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 9225 Data Rates
The frequency of a master timebase (fM) controls the data rate (fs) of the NI 9225. The NI 9225 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 9225 with other modules that use master timebases to control sampling, all of the modules must
NI 9225 Operating Instructions and Specifications | © National Instruments | 15
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share a single master timebase source. Refer to the software help
f
M
256÷
n
-------------------- -
for information about configuring the master timebase source for the NI 9225. Visit ni.com/info and enter cseriesdoc for information about C Series documentation.
The following equation provides the available data rates of the NI 9225:
=
f
s
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 9225 has a different set of data rates.
Note The cRIO-9151 R Series Expansion chassis does
not support sharing timebases between modules.
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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.
NI 9225 Operating Instructions and Specifications | © National Instruments | 17
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Specifications
The following specifications are typical for the range -40 to 70 °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 (f
M
)
Frequency ................................... 12.8 MHz
Accuracy..................................... ±100 ppm max
Data rate range (f
) using internal master timebase
s
Minimum.................................... 1.613 kS/s
Maximum ................................... 50 kS/s
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Data rate range (fs) using external master timebase
f
M
256÷
n
-------------------- -
Minimum.................................... 390.625 S/s
Maximum ................................... 51.36 kS/s
Data rates
Operating voltage ranges
Minimum.................................... 294 V
Typical ........................................ 300 V
1
(fs)................................... , n = 1, 2, ..., 31
2
rms
rms
Typical scaling coefficient ................50.66 µV/LSB
Overvoltage protection ..................... ±450 VDC
Input coupling...................................DC
Input impedance (AI+ to AI-)........... 1 M
1
The data rate must remain within the appropriate data rate range. Refer to the
Understanding NI 9225 Data Rates section for more information.
2
Refer to the Safety Guidelines section for more information about safe operating
voltages.
NI 9225 Operating Instructions and Specifications | © National Instruments | 19
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Accuracy
Percent of
Range
(Offset Error)
Measurement Conditions
Percent of
Reading
(Gain Error)
Calibrated max (-40 to 70 °C) ±0.23% ±0.05%
Calibrated typ (25 °C, ±5 °C) ±0.05% ±0.008%
Calibrated max (25 °C, ±15 °C) ±0.084% ±0.016%
Uncalibrated max (-40 to 70 °C) ±1.6% ±0.66%
Uncalibrated typ (25 °C, ±5 °C) ±0.4% ±0.09%
*
Range equals 425 V.
Input noise ........................................ 2 mV
rms
*
Stability
Gain drift .................................... ±10 ppm/°C
Offset drift .................................. ±970 µV/°C
Post calibration gain match
(ch-to-ch, 20 kHz)............................. ±0.25 dB max
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Crosstalk (60 Hz)..............................–130 dB
5
512
-------- -
Phase match
Ch-to-ch, max............................. 0.035°/kHz
Module-to-module, max............. 0.035°/kHz + 360° · f
Phase linearity (fs = 50 kS/s) ............. 0.22° max
Input delay ........................................ 40 /f
+ 3.6 µs
s
Passband
Frequency ................................... 0.453 · f
s
Flatness (fs = 50 kS/s) ................. ±100 mdB max
Stopband
Frequency ................................... 0.547 · f
s
Rejection..................................... -100 dB
Alias-free bandwidth ........................0.453 · f
s
in/fM
-3 dB bandwidth (fs = 50 kS/s).......... 24.56 kHz
CMRR (f
= 60 Hz).......................... 104 dB
in
SFDR (1 kHz, -60 dBFS)..................128 dBFS
NI 9225 Operating Instructions and Specifications | © National Instruments | 21
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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
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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
(1.95to2.21lb· in.)
2
Ferrules ............................................. 0.25 mm
to 0.5 mm
Weight............................................... 141 g (5.0 oz)
Safety
Maximum Voltage
Connect only voltages that are within the following limits.
AI+ to AI- ......................................... 300 V
rms
max
2
NI 9225 Operating Instructions and Specifications | © National Instruments | 23
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Isolation Voltages
Channel-to-channel
Continuous .................................600 V
, Measurement
rms
Category II
Withstand.................................... 2,300 V
, verified by a 5 s
rms
dielectric withstand test
Channel-to-earth ground
Continuous .................................300 V
, Measurement
rms
Category II
Withstand.................................... 2,300 V
, verified by a 5 s
rms
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 9225 to signals or use
for measurements within Measurement Categories III or IV.
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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
for the 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
NI 9225 Operating Instructions and Specifications | © National Instruments | 25
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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
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Shock and Vibration
To meet these specifications, you must panel mount the system and either affix ferrules to the ends of the terminal wires or use the NI 9971 backshell kit to protect the connections.
Operating vibration
Random (IEC 60068-2-64)......... 5 g
, 10 to 500 Hz
rms
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
NI 9225 Operating Instructions and Specifications | © National Instruments | 27
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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
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.
28 | ni.com | NI 9225 Operating Instructions and Specifications
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NI 9225 Operating Instructions and Specifications | © National Instruments | 29
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Calibration
You can obtain the calibration certificate and information about calibration services for the NI 9225 at
ni.com/calibration.
Calibration interval ........................... 1 year
Worldwide Support and Services
The National Instruments website is your complete resource for technical support. At everything from troubleshooting and application development self-help resources to email and phone assistance from NI Application Engineers.
Visit
ni.com/services for NI Factory Installation Services,
repairs, extended warranty, and other services.
Visit
ni.com/register to register your National Instruments
ni.com/support you have access to
product. Product registration facilitates technical support and ensures that you receive important information updates from NI.
A Declaration of Conformity (DoC) is our claim of compliance with the Council of the European Communities using the manufacturer’s declaration of conformity. This system affords the user protection for electromagnetic compatibility (EMC) and
30 | ni.com | NI 9225 Operating Instructions and Specifications
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product safety. You can obtain the DoC for your product by visiting
ni.com/certification. If your product supports calibration,
you can obtain the calibration certificate for your product at ni.com/calibration.
National Instruments corporate headquarters is located at 11500 North Mopac Expressway, Austin, Texas, 78759-3504. National Instruments also has offices located around the world. For telephone support in the United States, create your service request at
ni.com/support or dial 1 866 ASK MYNI (275 6964). For
telephone support outside the United States, visit the Worldwide Offices section of ni.com/niglobal to access the branch office websites, which provide up-to-date contact information, support phone numbers, email addresses, and current events.
NI 9225 Operating Instructions and Specifications | © National Instruments | 31
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