National Instruments NI 9234 Operating Instructions Manual
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National Instruments NI 9234 Operating Instructions Manual

National instruments analog input module operating instructions and specifications
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OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9234
4-Channel, ±5 V, 24-Bit Software-Selectable
IEPE and AC/DC Analog Input Module
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ni.com/manuals

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Summary of Contents for National Instruments NI 9234

  • Page 1 OPERATING INSTRUCTIONS AND SPECIFICATIONS NI 9234 4-Channel, ±5 V, 24-Bit Software-Selectable IEPE and AC/DC Analog Input Module Français Deutsch ni.com/manuals...

  • Page 2: For Information

    This document describes how to use the National Instruments 9234 and includes specifications and connector assignments for the NI 9234. Visit ni.com/info 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.

  • Page 3: Safety Guidelines For Hazardous Locations

    Touching this component may result in bodily injury. Safety Guidelines for Hazardous Locations The NI 9234 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;...
  • Page 4 II 3G and is suitable for use in Zone 2 hazardous locations. If you are using the NI 9234 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.
  • Page 5 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. and search for the LR certificate, or NI 9234 Operating Instructions and Specifications...
  • Page 6 Connecting the NI 9234 The NI 9234 has four BNC connectors that provide connections to four simultaneously sampled analog input channels. Figure 1. NI 9234 Connector Assignments NI 9234 Operating Instructions and Specifications AI0+ AI0– AI1+ AI1– AI2+ AI2– AI3+ AI3–...
  • Page 7 If you make a ground-referenced connection between the signal source and the NI 9234, make sure the voltage on the AI– shell is in the common-mode range to ensure proper operation of the NI 9234. The AI– shell is protected against accidental contact with overvoltages within the overvoltage protection range.
  • Page 8 Refer to Figures 2 and 3 for illustrations of connecting grounded and floating signal sources to the NI 9234. Signal Source – Figure 2. Connecting a Grounded Signal Source to the NI 9234 NI 9234 Operating Instructions and Specifications Common AI– Mode...
  • Page 9 – Figure 3. Connecting a Floating Signal Source to the NI 9234 The NI 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...
  • Page 10 NI 9234 Circuitry The NI 9234 analog input channels are referenced to chassis ground through a 50 Ω resistor. To minimize ground noise, make sure the chassis ground is connected to earth ground. Each channel is protected from overvoltages. The input signal on each channel is buffered, conditioned, and then sampled by a 24-bit Delta-Sigma ADC.
  • Page 11 The NI 9234 uses common-mode bias current to bias the current-limiting diodes when IEPE current is turned off. When the NI 9234 is 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...
  • Page 12 Signal Source – Figure 5. Measurement Error Introduced by Common-Mode Bias Current The NI 9234 also has TEDS circuitry. For more information about TEDS, go to ni.com/info NI 9234 Operating Instructions and Specifications AI– Lead Impedance AI– and enter rdteds...
  • Page 13 The small amount of variation in gain with respect to frequency is called the passband flatness. The digital filters of the NI 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.
  • Page 14 0.025 0.000 –0.025 –0.050 Figure 6. NI 9234 Typical Passband Flatness NI 9234 Operating Instructions and Specifications Frequency/Data Rate ni.com...

  • Page 15: Alias-Free Bandwidth

    Alias-Free Bandwidth Any signal that appears in the alias-free bandwidth of the NI 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.
  • Page 16 13.1072 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 9234 with other modules that use master timebases to control sampling, all of the modules must share a single master timebase source.

  • Page 17: Sleep Mode

    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 9234 has a different set of data rates. The cRIO-9151 R Series Expansion chassis does Note not support sharing timebases between modules.

  • Page 18: Specifications

    Type of TEDS supported ... IEEE 1451.4 TEDS Class I Internal master timebase (f Frequency ... 13.1072 MHz Accuracy... ±50 ppm max Data rate range (f ) using internal master timebase Minimum... 1.652 kS/s Maximum ... 51.2 kS/s NI 9234 Operating Instructions and Specifications (with analog prefiltering) ni.com...
  • Page 19 The data rate must remain within the appropriate data rate range. Refer to the Understanding NI 9234 Data Rates © National Instruments Corp. ÷ -------------------- - , n = 1, 2, …, 31 section for more information. NI 9234 Operating Instructions and Specifications...
  • Page 20 AC cutoff frequency response –0.5 –1.0 NI 9234 Operating Instructions and Specifications Frequency (Hz) ni.com...
  • Page 21 Common-mode voltage range (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 μA for 10 μs © National Instruments Corp. NI 9234 Operating Instructions and Specifications...
  • Page 22 AI+ and AI– ... ±30 V For a low-impedance source connected to AI+ and AI– ... –6 to 30 V Input delay ... 38.4/ f NI 9234 Operating Instructions and Specifications ± V ) must be 0 to 19 bias...
  • Page 23 (Gain Error) 0.34%, ±0.03 dB 0.05%, ±0.005 dB 1.9%, ±0.16 dB 0.48%, ±0.04 dB section for information regarding grounded signal NI 9234 Operating Instructions and Specifications Percent of Range (Offset Error) ±0.14%, 7.1 mV ±0.006%, 0.3 mV ±0.27%, 13.9 mV ±0.04%,...
  • Page 24 Frequency ... 0.45 · f Flatness (f = 51.2 kS/s)... ±40 mdB (pk-to-pk max) Phase nonlinearity = 51.2 kS/s) ... ±0.45° max Stopband Frequency ... 0.55 · f Rejection... 100 dB NI 9234 Operating Instructions and Specifications · 0.045° + 0.04 max ni.com...
  • Page 25 AI– (shield) to chassis ground... 50 Ω © National Instruments Corp. 51.2 kS/s 25.6 kS/s 97 dBFS 99 dBFS 50 μV 40 μV 310 nV/√Hz 350 nV/√Hz NI 9234 Operating Instructions and Specifications 2.048 kS/s 103 dBFS 25 μV 780 nV/√Hz...
  • Page 26 MTBF ... 390,362 hours at 25 °C; Contact NI for Bellcore MTBF specifications Note at other temperatures or for MIL-HDBK-217F specifications. NI 9234 Operating Instructions and Specifications 1 kHz –95 dB –95 dB Bellcore Issue 2, Method 1, Case 3, Limited Part Stress...

  • Page 27: Power Requirements

    Active mode ... 930 mW max Sleep mode ... 25 μW max Physical Characteristics If you need to clean the module, wipe it with a dry towel. Weight... 173 g (6.1 oz) © National Instruments Corp. NI 9234 Operating Instructions and Specifications...
  • Page 28 Such voltage measurements include signal levels, special equipment, limited-energy parts of equipment, circuits powered by regulated low-voltage sources, and electronics. Do not connect the NI 9234 to signals or use for Caution measurements within Measurement Categories II, III, or IV.
  • Page 29 © National Instruments Corp. Groups A, B, C, D, T4; Class I, Zone 2, AEx nA IIC T4 Groups A, B, C, D, T4; Class I, Zone 2, Ex nA IIC T4 Online Product Certification NI 9234 Operating Instructions and Specifications section.

  • Page 30: Electromagnetic Compatibility

    ICES-001: Class A emissions For the standards applied to assess the EMC of this Note product, refer to the For EMC compliance, operate this device with Note shielded cabling. NI 9234 Operating Instructions and Specifications Online Product Certification section. ni.com...

  • Page 31: Online Product Certification

    To obtain product certifications and the DoC for this product, visit , search by module number or product line, certification and click the appropriate link in the Certification column. © National Instruments Corp. ni.com/ NI 9234 Operating Instructions and Specifications...

  • Page 32: Shock And Vibration

    (IEC 60068-2-27)... 30 g, 11 ms half sine, 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.

  • Page 33: Environmental Management

    Environment Web page at contains the environmental regulations and directives with which NI complies, as well as other environmental information not included in this document. © National Instruments Corp. noncondensing noncondensing ni.com/environment NI 9234 Operating Instructions and Specifications . This page...
  • Page 34 China RoHS compliance, go to environment/rohs_china Calibration You can obtain the calibration certificate and information about calibration services for the NI 9234 at Calibration interval ... 1 year NI 9234 Operating Instructions and Specifications At the end of their life cycle, all products...

  • Page 35: Where To Go For Support

    Where to Go for Support The National Instruments Web site is your complete resource for technical support. At you have access to ni.com/support everything from troubleshooting and application development self-help resources to email and phone assistance from NI Application Engineers.
  • Page 36 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.

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