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National Instruments NI 9234 Operating Instructions Manual Download Page 10

NI 9234 Operating Instructions and Specifications

10

ni.com

NI 9234 Circuitry

The NI 9234 analog inp

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t channels are referenced to chassis 

gro

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nd thro

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 resistor. To minimize gro

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nd noise, make 

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nd is connected to earth gro

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nd. Each channel 

is protected from overvoltages. The inp

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ffered, conditioned, and then sampled by a 24-bit Delta-Sigma 

ADC. Yo

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pling. For channels set to AC co

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 can t

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excitation c

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rrent on or off. Refer to the software help for 

information abo

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ring channels on the NI 9234.

Summary of Contents for 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 ni com manuals Deutsch Français ...

Page 2: ...ing and programming the system refer to the system documentation Visit ni com info and enter cseriesdoc for information about C Series documentation Note The safety guidelines and specifications in this document are specific to the NI 9234 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 dete...

Page 3: ... 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 9234 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 s...

Page 4: ...be within the following limit Capacitance 0 2 μF max Special Conditions for Hazardous Locations Use in Europe This equipment has been evaluated as Ex nA IIC T4 equipment under DEMKO Certificate No 07 ATEX 0626664X Each module is marked 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 ...

Page 5: ...earch 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...

Page 6: ...nd Specifications 6 ni com 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 AI3 AI3 AI2 AI2 AI0 AI0 AI1 AI1 ...

Page 7: ...eference Connecting Signal Sources to the NI 9234 You can connect ground referenced or floating signal sources to the NI 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 coming in contact with each other the modules or the chassis If you make a ground referenced connection between the signal source ...

Page 8: ...ecifications 8 ni com Refer to Figures 2 and 3 for illustrations of connecting grounded and floating signal sources to the NI 9234 Figure 2 Connecting a Grounded Signal Source to the NI 9234 NI 9234 AI AI Signal Source Common Mode Voltage ...

Page 9: ... 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 9234 results in a floating connection even though the case of the sensor is grounded NI 9234 AI AI Signal Source ...

Page 10: ...s 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 You can configure each channel in software for AC or DC coupling For channels set to AC coupling you can turn the IEPE excitation current on or off Refer to the software help for information about configuring channel...

Page 11: ...auses 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 2 mA IEPE on off AI AI...

Page 12: ... 12 ni com 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 and enter rdteds NI 9234 AI AI Signal Source AI Lead Impedance Common Mode Bias Current ...

Page 13: ... 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 t...

Page 14: ...NI 9234 Operating Instructions and Specifications 14 ni com Figure 6 NI 9234 Typical Passband Flatness Frequency Data Rate 0 5 0 4 0 025 0 000 0 025 0 050 0 3 0 2 0 1 0 Gain dB ...

Page 15: ...h 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 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 stopb...

Page 16: ...hat use master timebases to control sampling all of the modules must share a single master timebase source Refer to the software help for information about configuring the master timebase source for the NI 9234 Visit ni com info and enter cseriesdoc for information about C Series documentation The following equation provides the available data rates of the NI 9234 fs where n is any integer from 1 ...

Page 17: ... 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...

Page 18: ...nput 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 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 ...

Page 19: ...ster timebase Minimum 0 391 kS s Maximum 52 734 kS s Data rates1 fs n 1 2 31 Input coupling AC DC software selectable AC cutoff frequency 3 dB 0 5 Hz 0 1 dB 4 6 Hz max 1 The data rate must remain within the appropriate data rate range Refer to the Understanding NI 9234 Data Rates section for more information fM 256 n ...

Page 20: ...NI 9234 Operating Instructions and Specifications 20 ni com AC cutoff frequency response Frequency Hz 10 4 0 5 0 0 0 5 1 0 3 2 1 0 9 8 7 6 5 Gain dB ...

Page 21: ...ecifications Input range 5 V AC voltage full scale range Minimum 5 Vpk Typical 5 1 Vpk Maximum 5 2 Vpk 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 ...

Page 22: ...age range Vcommon mode Vbias Vfull scale must be 0 to 19 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 38 4 fs 3 2 μs where Vcommon mode is the common mode voltage applied to the NI 9234 Vbias is the bias voltage of the IEPE sensor Vfull scale is the full scale voltage of...

Page 23: ...ing grounded signal sources and measurement accuracy Measurement Conditions Percent of Reading Gain Error Percent of Range Offset Error Calibrated max 40 to 70 C 0 34 0 03 dB 0 14 7 1 mV Calibrated typ 25 C 5 C 0 05 0 005 dB 0 006 0 3 mV Uncalibrated max 40 to 70 C 1 9 0 16 dB 0 27 13 9 mV Uncalibrated typ 25 C 5 C 0 48 0 04 dB 0 04 2 3 mV Range 5 1 Vpk ...

Page 24: ...B C 52 ppm C Offset drift Typical 19 2 μV C Maximum 118 μV C Channel to channel matching Gain Typical 0 01 dB Maximum 0 04 dB Phase fin in kHz fin 0 045 0 04 max Passband Frequency 0 45 fs Flatness fs 51 2 kS s 40 mdB pk to pk max Phase nonlinearity fs 51 2 kS s 0 45 max Stopband Frequency 0 55 fs Rejection 100 dB ...

Page 25: ...lk 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 Input impedance Differential 305 kΩ AI shield to chassis ground 50 Ω Idle Channel 51 2 kS s 25 6 kS s 2 048 kS s Noise 97 dBFS 99 dBFS 103 dBFS 50 μVrms 40 μVrms 25 μVrms Noise density 310 nV Hz 350 nV Hz 780 nV Hz ...

Page 26: ...8 kHz 4 1 amplitude ratio 80 dB CCIF 11 kHz 12 kHz 1 1 amplitude ratio 93 dB MTBF 390 362 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 Input Amplitude 1 kHz 8 kHz 1 dBFS 95 dB 87 dB 20 dBFS 95 dB 80 dB ...

Page 27: ...ations Power Requirements Power consumption from chassis Active mode 900 mW max Sleep mode 25 μW max Thermal dissipation at 70 C 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 ...

Page 28: ...t 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...

Page 29: ... Groups A B C D T4 Class I Zone 2 Ex nA IIC T4 Europe DEMKO Ex nA IIC T4 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 the Online Product Certification se...

Page 30: ...ol and laboratory use EN 61326 IEC 61326 Class A emissions Basic immunity EN 55011 CISPR 11 Group 1 Class A emissions AS NZS CISPR 11 Group 1 Class A emissions FCC 47 CFR Part 15B Class A emissions ICES 001 Class A emissions Note For the standards applied to assess the EMC of this product refer to the Online Product Certification section Note For EMC compliance operate this device with shielded ca...

Page 31: ...w Voltage Directive safety 2004 108 EC Electromagnetic Compatibility Directive EMC 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 ...

Page 32: ... 2 27 30 g 11 ms half sine 50 g 3 ms half sine 18 shocks at 6 orientations 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 tem...

Page 33: ...mitted 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 whic...

Page 34: ...ational Instruments WEEE initiatives visit ni com environment weee htm Calibration You can obtain the calibration certificate and information about calibration services for the NI 9234 at ni com calibration Calibration interval 1 year ᄤֵᙃѻક ᶧ ࠊㅵ ࡲ Ё RoHS Ё ᅶ National Instruments ヺড়Ё ᄤֵᙃ ѻકЁ䰤ࠊՓ ᶤѯ ᆇ 䋼ᣛҸ RoHS DŽ Ѣ National Instruments Ё RoHS ড়㾘ᗻֵᙃˈ䇋ⱏᔩ ni com environment rohs_chinaDŽ For information ab...

Page 35: ...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...

Page 36: ...tents txt file on your media or the National Instruments Patent Notice at ni com patents 2008 National Instruments Corp All rights reserved 374238C 01 Aug08 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 Singap...

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