National Instruments NI 9234 User's Manual
Contents
1. 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 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 National Instruments Corp 9 NI 9234 Operating Instructions and Specifications NI 9234 Circuitry The NI 9234 analog input channels are referenced to chassis ground through a 50 Q 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 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 channels on the NI 9234 NI 9234 Operating Instructions and Specifications 10 ni com Z TX2mAIEPEonof 1 ACIDC Coupling Alt H i i4 n i AL ADC i 1 i i Current Common i Limiting 4 Mode Amplifier H Diodes Bias and 502 Current Prefilter f i S77 i e Figure 4 NI 9234 Input Circuitry for One Channel The NI 9234 uses common mode bias current to2. RoHS AUER Ek TEESE ni com environment rohs china Forinformation 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 9234 at ni com calibration Calibration interval year NI 9234 Operating Instructions and Specifications 34 ni com 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 4119
3. 2 1 IEC 60068 2 2 40 to 85 C Ingress protection IP 40 NI 9234 Operating Instructions and Specifications 32 ni com Operating humidity IEC 60068 2 56 esses 10 to 9096 RH noncondensing Storage humidity IEC 60068 2 56 esses 5 to 9596 RH noncondensing Maximum altitude 2 000 m Pollution Degree IEC 60664 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 National Instruments Corp 33 NI 9234 Operating Instructions and Specifications Waste Electrical and Electronic Equipment WEEE X EU Customers At the end of their 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 htm Baar mis Riehl SEDAE CHE ROHS RS E National Instruments A P ES T f Bh oG T dd rp Eg gap f REA dz da RoHS T National Instruments F E
4. 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 National Instruments Corp 15 NI 9234 Operating Instructions and Specifications Understanding NI 9234 Data Rates The frequency of a master timebase fy controls the data rate f of the NI 9234 The NI 9234 includes an internal master timebase with a frequency of 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 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 fu 256 Js n 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 NI 9234 Operating Instructions and Specifications 16 ni com of 13 1072 MHZz the result is data rates of 51 2 kS s 25 6 kS s 17 067 kS s and so on down to 1 652 kS s depending on the value of n When usin
5. 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 Q 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 National Instruments Corp 11 NI 9234 Operating Instructions and Specifications Signal Al Source i Mode i Impedance i Bias Al Current Figure 5 Measurement Error Introduced by Common Mode Bias Current AL Lead Common NI 9234 The NI 9234 also has TEDS circuitry For more information about TEDS go to ni com info and enter rdteds NI 9234 Operating Instructions and Specifications 12 ni com Understanding NI 9234 Filtering The NI 9234 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 9234 represents signals within the passband as quantified primarily by passband flat
6. for more information The center pin of the connector AI provides the DC excitation when enabled and the positive input signal connection The shell of the connector AI provides the excitation return path and the signal ground reference 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 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 Refer to the Specifications section for more information about operating voltages and overvoltage protection National Instruments Corp 7 NI 9234 Operating Instructions and Specifications Refer to Figures 2 and 3 for illustrations of connecting grounded and floating signal sources to the NI 9234 Signal Source Al Common Als eet Mode Voltage Figure 2 Connecting a Grounded Signal Source to the NI 9234 NI 9234 Operating Instructions and Specifications 8 ni com Signal Al Source i O E EM
7. 0000 Israel 972 3 6393737 Italy 39 02 41309277 Japan 0120 527196 National Instruments Corp 35 NI 9234 Operating Instructions and Specifications 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 1ega1 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 technology refer to the appropriate location Help Patents in your software the patents 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
8. CCIF 11 kHz 12 kHz 1 1 amplitude ratio 80 dB 93 dB 390 362 hours at 25 C Bellcore Issue 2 Method 1 Case 3 Limited Part Stress Method ei Note Contact NI for Bellcore MTBF specifications at other temperatures or for MIL HDBK 217F specifications NI 9234 Operating Instructions and Specifications 26 ni com Power Requirements Power consumption from chassis Active mode cccceccesteeteeereeeee 900 mW max Sleep mode sss 25 uW max Thermal dissipation at 70 C Active mode sss 930 mW max Sleep mode s 25 uW max Physical Characteristics If you need to clean the module wipe it with a dry towel Weights cin Et d 173 g 6 1 oz National Instruments Corp 27 NI 9234 Operating Instructions and Specifications Safety Safety Voltages Connect only voltages that are within the following limits Channel to earth ground x30 V max Measurement Category I Isolation Channel to channel None Channel to earth ground Measurement Category I is for measurements performed on circuits not 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 par
9. Instructions and Specifications IEPE compliance voltage 19 V max If you are using an IEPE sensor use the following equation to make sure your configuration meets the IEPE compliance voltage range Veommon mode Maa V full scale must be 0 to 19 where Viommon mode 1 the common mode voltage applied to the NI 9234 Vpias is the bias voltage of the IEPE sensor Vyjull scale 1 the full scale voltage of the IEPE sensor Overvoltage protection with respect to chassis ground For a signal source connected to AL and AI nn 30 V For a low impedance source connected to AL and AI 6 to 30 V Input delay sess 38 4 fs 3 2 Us NI 9234 Operating Instructions and Specifications 22 ni com Accuracy Range 5 1 Vix Percent of Percent of Reading Range Measurement Conditions Gain Error Offset Error Calibrated max 40 to 70 C 0 3496 0 14 0 03 dB 7 1 mV Calibrated typ 25 C 5 C 0 05 0 006 0 005 dB 0 3 mV Uncalibrated max 40 to 70 C 1 9 0 27 0 16 dB 13 9 mV Uncalibrated typ 25 C 5 C 0 48 0 04 0 04 dB 2 3 mV Refer to the NJ 9234 Circuitry section for information regarding grounded signal sources and measurement accuracy National Instruments Corp 23 NI 9234 Operating Instructions and Specifications Gain drift Typical tee deiere hien 0 14 mdB C 16 ppm C Maximum ee
10. L IIC T4 equipment NI 9234 Operating Instructions and Specifications 4 ni com 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 d 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 National Instruments Corp 5 NI 9234 Operating Instructions and Specifications Connecting the NI 9234 The NI 9234 has four BNC connectors that provide connections to four simultaneously sampled analog input channels Al0 AIO Al1 Ali Al2 Al2 AI34 Al3 OOO Figure 1 NI 9234 Connector Assignments NI 9234 Operating Instructions and Specifications 6 ni com Each channel has a BNC connector to which you can connect a signal source You can also enable excitation current on a per channel basis to connect Integrated Electronics Piezoelectric IEPE sensors Refer to the NI 9234 Circuitry section
11. OPERATING INSTRUCTIONS AND SPECIFICATIONS NI 9234 4 Channel 5 V 24 Bit Software Selectable IEPE and AC DC Analog Input Module Fran ais Deutsch H R S30 APX ni com manuals Qy NATIONAL y INSTRUMENTS This document describes how to use the National Instruments 9234 and includes specifications and connector assignments for the NI 9234 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 Visitni com info and enter cseriesdoc for information about C Series documentation 3 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 determine the safety ratings and specifications for the entire system Visit ni com info and enter cseriesdoc for information about C Series documentation NI 9234 Operating Instructions and Specifications 2 ni com Safety Guidelines Operate the NI 9234 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 Safety Guidelines for Hazardous Locations The NI 9234 is suitable for use in Class I Division 2 G
12. ection Note For EMC compliance operate this device with shielded cabling NI 9234 Operating Instructions and Specifications 30 ni com CE Compliance C This product meets the essential requirements of applicable European Directives as follows e 2006 95 EC Low Voltage Directive safety e 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 National Instruments Corp 31 NI 9234 Operating Instructions and Specifications Shock and Vibration To meet these specifications you must panel mount the system Operating vibration Random IEC 60068 2 64 5 gs 10 to 500 Hz Sinusoidal IEC 60068 2 6 5 g 10 to 500 Hz Operating shock IEC oe 220 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 temperature IEC 60068
13. g an external timebase with a frequency other than 13 1072 MHz the NI 9234 has a different set of data rates el Note The cRIO 9151 R Series Expansion chassis does not support sharing timebases between modules 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 National Instruments Corp 17 NI 9234 Operating Instructions and Specifications Specifications The following specifications are typical for the range 40 to 70 C unless otherwise noted Input Characteristics Number of channels 4 analog input channels ADC resolution cece eeeeeeeees 24 bits Type of ET Delta Sigma with analog prefiltering Sampling mode Simultaneous Type of TEDS supported IEEE 1451 4 TEDS Class I Internal master timebase fy F
14. ness 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 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 Figure 6 shows typical passband flatness for the NI 9234 National Instruments Corp 13 NI 9234 Operating Instructions and Specifications 0 025 0 000 Gain dB 0 025 0 050 0 0 1 0 2 0 3 0 4 0 5 Frequency Data Rate Figure 6 NI 9234 Typical Passband Flatness NI 9234 Operating Instructions and Specifications 14 ni com 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 9234 is not an aliased artifact of signals at a higher frequency
15. re 0 45 mdB C 52 ppm C Offset drift Typical eie eus 19 2 uV C Maximum as eenei 118 uV C Channel to channel matching Gain Typical ied 0 01 dB Maximum 0 04 dB Phase fin in KH2z Fin 0 045 0 04 max Passband Frequency eerte 0 45 f Flatness f 51 2 KS s 40 mdB pk to pk max Phase nonlinearity f 5T EE 0 45 max Stopband Frequency seen 0 55 f Rejection eet eerie 100 dB NI 9234 Operating Instructions and Specifications 24 ni com Alias free bandwidth 0 45 f Oversample rate sss 64 f Crosstalk kan 110 dB CMRR fin 1 kHz Minimum esee 40 dB Typical sect ehe ar SFDR fin 1 kHz 60 dBFS 120 dB Idle channel noise and noise density Idle Channel 51 2 kS s 25 6 kS s 2 048 kS s Noise 97 dBFS 99 dBFS 103 dBFS 50 UV ms 40 UV ms 25 HN ans Noise density 310 nV VHz 350 nV VHZz 780 nV Hz Input impedance Differential sss 305 kQ AL shield to chassis ground 50 Q National Instruments Corp 25 NI 9234 Operating Instructions and Specifications Total harmonic distortion THD Input Amplitude 1kHz 8 kHz dBFS 95 dB 87 dB 20 dBFS 95 dB 80 dB Intermodulation distortion 1 dBFS DIN 250 Hz 8 kHz 4 1 amplitude ratio
16. requency see 13 1072 MHz ACCULACY io crecen tereti tenons x50 ppm max Data rate range f using internal master timebase Minimum 1 652 kS s Maximum 0 cccccceeseceeseeeeees 51 2 kS s NI 9234 Operating Instructions and Specifications 18 ni com Data rate range f using external master timebase Minimum 0 391 kS s Maximum 52 734 kS s 256 Data rates f isses fut T nel 4 21 I Input coupling se AC DC software selectable AC cutoff frequency S3 dB EE 0 5 Hz ell dB e usscscseseiesms 4 6 Hz max The data rate must remain within the appropriate data rate range Refer to the Understanding NI 9234 Data Rates section for more information National Instruments Corp 19 NI 9234 Operating Instructions and Specifications AC cutoff frequency response 0 5 0 0 a S amp o 0 5 1 0 0 1 2 3 4 5 6 7 8 9 10 Frequency Hz NI 9234 Operating Instructions and Specifications 20 ni com Input onge eene 5 V AC voltage full scale range Minimum eene 5 Vy Typical oett d etie 5 1 Vox Maximum seeeeeeree 5 2 Vox Common mode voltage range AI to earth ground 2 V max IEPE excitation current software selectable on off Mmmum nenien 2 0 mA Typical dire Rs 2 mA Power on glitch ieee 90 uA for 10 us National Instruments Corp 21 NI 9234 Operating
17. roups 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 switched off or the area is known to be nonhazardous A Caution Do not remove modules unless power has been switched off or the area is known to be nonhazardous National Instruments Corp 3 NI 9234 Operating Instructions and Specifications Caution Substitution of components may impair UN suitability for Class I Division 2 d 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 A Caution For Zone 2 applications connected signals must be within the following limit Capacitance sssini 0 2 uF 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 x 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 lt 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 n
18. ts of equipment circuits powered by regulated low voltage sources and electronics Caution Do not connect the NI 9234 to signals or use for measurements within Measurement Categories II III or IV NI 9234 Operating Instructions and Specifications 28 ni com Hazardous Locations UR d EE EN Class I Division 2 Groups A B C D T4 Class I Zone 2 AEx nA IIC T4 Canada CHL Class I Division 2 Groups A B C D T4 Class I Zone 2 Ex nA IIC T4 Europe DEMRKO 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 e EC 61010 1 EN 61010 1 e UL 61010 1 CSA 61010 1 Note For UL and other safety certifications refer to the product label or the Online Product Certification section National Instruments Corp 29 NI 9234 Operating Instructions and Specifications Electromagnetic Compatibility This product meets the requirements of the following EMC standards for electrical equipment for measurement control 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 s
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