OPERATING INSTRUCTIONS AND SPECIFICATIONS NI 9225E 3-Channel, 300 Vrms, 24-Bit, Simultaneous, Channel-to-Channel Isolated Analog Input Module
This document describes how to use the National Instruments 9225E and includes dimensions, terminal assignments, and specifications for the NI 9225E. Visit ni.com/info and enter rdsoftwareversion to determine which software you need for the modules you are using. For information about installing, configuring, and programming the system, refer to the system documentation. Visit ni.com/info and enter cseriesdoc for information about C Series documentation.
NI 9225E Dimensions The following figure shows the dimensions of the NI 9225E. 73.4 (2.89) 58.4 (2.30) 66.0 (2.60) 0.0 (0.00) 26.7 (1.05) 0.0 (0.00) Figure 1. NI 9225E Dimensions in Millimeters (Inches) © National Instruments Corp.
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. AI0+ AI0– 0 1 AI1+ AI1– 0 1 AI2+ AI2– 0 1 Figure 2. NI 9225E Terminal Assignments NI 9225E Operating Instructions and Specifications 4 ni.
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.
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 6 ni.
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+ AI– Overvoltage Protection ADC Amplifier Prefilter NI 9225E Figure 5.
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.
0.025 Gain (dB) 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.
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.
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 M ÷ 256 fs = -------------------n where n is any integer from 1 to 31. However, the data rate must remain within the appropriate data rate range.
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.
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 .................................
Data rate range (fs) using external master timebase Minimum.................................... 390.6 S/s Maximum ................................... 51.2 kS/s f M ÷ 256 Data rates1 (fs) ................................... --------------------- , n = 1, 2, ..., 31 n Operating voltage ranges Minimum.................................... 294 Vrms Typical ........................................ 300 Vrms Typical scaling coefficient ................ 50.66 μV/LSB Overvoltage protection .....................
Accuracy Percent of Reading (Gain Error) Percent of Range* (Offset 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% Measurement Conditions * Range equals 425 V. Input noise ........................................ 2 mVrms Stability Gain drift .................................... ±10 ppm/°C Offset drift ....
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.........
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 .................................
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.
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....................................
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.
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)..............................
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.
⬉ᄤֵᙃѻક∵ᶧࠊㅵ⧚ࡲ⊩ ˄Ё RoHS˅ Ёᅶ᠋ National Instruments ヺড়Ё⬉ᄤֵᙃ ѻકЁ䰤ࠊՓ⫼ᶤѯ᳝ᆇ⠽䋼ᣛҸ (RoHS)DŽ݇Ѣ National Instruments Ё RoHS ড়㾘ᗻֵᙃˈ䇋ⱏᔩ ni.com/environment/rohs_chinaDŽ (For information about China RoHS compliance, go to ni.com/ environment/rohs_china.) 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.
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.
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