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National Instruments NI 9235 Operating Instructions Manual Download Page 2

NI 9235/9236 

2

ni.com

This doc

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ment describes how to 

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se the National Instr

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ments 9235 

and National Instr

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des specifications and 

terminal assignments. In this doc

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ment, the NI 9235 and NI 9236 

are referred to incl

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sively as the NI 9235/9236. Visit 

ni.com/info

 and enter 

rd

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oftwarever

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 to determine 

which software yo

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 need for the mod

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 are 

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information abo

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system, refer to the system doc

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mentation. Visit 

ni.com/info

 

and enter 

c

s

erie

s

doc

 for information abo

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t C Series 

doc

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mentation.

Note

The safety g

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idelines and specifications in this 

doc

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ment are specific to the NI 9235/9236. The other 

components in the system might not meet the same safety 
ratings and specifications. Refer to the doc

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mentation for 

each component in the system to determine the safety 
ratings and specifications for the entire system. Visit 

ni.com/info

 and enter 

c

s

erie

s

doc

 for information 

abo

u

t C Series doc

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mentation.

Summary of Contents for NI 9235

Page 1: ...OPERATING INSTRUCTIONS AND SPECIFICATIONS NI 9235 9236 8 Channel 24 Bit Quarter Bridge Analog Input Module ni com manuals Deutsch Français ...

Page 2: ...tion 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 Note The safety guidelines and specifications in this document are specific to the NI 9235 9236 The other components in the system might not meet the same safety ratings and specifications Refer to the documentation for e...

Page 3: ...n 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 9235 9236 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...

Page 4: ...ng 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 9235 9236 in Gas Group IIC hazardous locations or in ambient temperatures of 40 C Ta 70 C you must us...

Page 5: ...rtificate 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 ...

Page 6: ...ble spring terminal connector that provides connections for 8 analog input channels Figure 1 NI 9235 9236 Terminal Assignments EXC0 AI0 RC0 EXC2 AI2 RC2 EXC4 AI4 RC4 EXC6 AI6 RC6 EXC1 AI1 RC1 EXC3 AI3 RC3 EXC5 AI5 RC5 EXC7 AI7 RC7 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 ...

Page 7: ... the quarter bridge completion Refer to Figure 2 for an illustration of how to connect quarter bridge sensors to the NI 9235 9236 Figure 2 Quarter Bridge Connections for the NI 9235 9236 For best system accuracy set up the connections to EXC and RC with equal lengths of an identical wire type and gauge For best system accuracy set up the connection to AI directly at the sensor instead of shorting ...

Page 8: ...o the detachable spring terminal connector Insert the screwdriver into a spring clamp activation slot and press a wire into the corresponding connector terminal then remove the screwdriver to clamp the wire into the terminal Refer to the Specifications section for more information about spring terminal wiring Figure 3 Connecting Wires to the NI 9235 9236 Connector ...

Page 9: ... Applications If an application is subject to high vibration National Instruments recommends that you use the NI 9965 backshell kit to protect the connections Refer to Figure 4 for an illustration of the NI 9965 connector backshell Figure 4 NI 9965 Connector Backshell ...

Page 10: ...common excitation supply You must connect each EXC terminal to only one gage to maintain the channel to channel crosstalk performance of the module Each channel on the NI 9235 9236 has an independent 24 bit ADC and input amplifier that enables you to sample signals from all eight channels simultaneously Refer to Figures 5 and 6 for illustrations of the input circuitry for one channel of the NI 923...

Page 11: ...ruments Corp 11 NI9235 9236 Figure 5 Input Circuitry for One Channel of the NI 9235 EXC AI RC Bridge Completion Resistor Filtered Differential Amplifier 2 0 V Bridge Excitation 120 Ω 50 kΩ Shunt Resistor ADC NI 9235 ...

Page 12: ... to prevent aliasing The filters on the NI 9235 9236 filter according to the sampling rate Refer to the Understanding NI 9235 9236 Filtering section for more information about filtering EXC AI RC Bridge Completion Resistor Filtered Differential Amplifier 3 3 V Bridge Excitation 350 Ω 100 kΩ Shunt Resistor ADC NI 9236 ...

Page 13: ...n then design the software application to correct subsequent readings for this gain error The gain error caused by a lead wire equals RL RG where RL is the lead wire resistance and RG is the quarter bridge completion resistance Shunt Calibration The NI 9235 9236 shunt calibration circuitry consists of a precision resistor and a software controlled switch connected across the internal quarter bridg...

Page 14: ... value to verify system setup or compensate for quarter bridge lead wire desensitization error Refer to the Specifications section for the shunt calibration output value Visit ni com info and enter lwcomp for information about lead wire compensation Excitation Voltage The NI 9235 9236 provides a constant excitation supply voltage to each channel The excitation supply provides sufficient output cur...

Page 15: ... 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 call...

Page 16: ...NI 9235 9236 16 ni com Figure 7 Typical Passband Response for the NI 9235 9236 Frequency kHz 5 4 0 025 0 000 0 025 0 050 3 2 1 0 Gain dB ...

Page 17: ...he NI 9235 9236 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 9235 9236 Data Rates The frequency of a master timebase fM controls the data rate fs of the NI 9235 9236 The NI 9235 9236 includes an int...

Page 18: ...eger in the set 2 4 5 63 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 10 kS s 8 333 kS s 7 143 kS s and so on down to 794 S s depending on the value of n When using an external timebase with a frequency other ...

Page 19: ...he 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 sec...

Page 20: ... the NI 9235 and the NI 9236 unless otherwise noted Input Characteristics Number of channels 8 analog input channels Quarter bridge completion NI 9235 120 Ω 10 ppm C max NI 9236 350 Ω 10 ppm C max ADC resolution 24 bits Type of ADC Delta Sigma with analog prefiltering Sampling mode Simultaneous Internal master timebase fM Frequency 12 8 MHz Accuracy 100 ppm max ...

Page 21: ...ebase Minimum 195 3125 S s Maximum 10 547 kS s Data rates1 fs n 2 4 5 63 Full scale range 29 4 mV V 62 500 με 55 500 με Scaling coefficient 3 5062 nV V per LSB Overvoltage protection between any two terminals 30 V 1 The data rate must remain within the appropriate data rate range Refer to the Understanding NI 9235 9236 Data Rates section for more information fM 256 n ...

Page 22: ...r cal 5 C 1 year after cal 5 C Calibrated typ 25 C 5 C 0 02 0 1 0 15 Calibrated max 40 to 70 C 0 07 0 17 0 4 Uncalibrated typ 25 C 5 C 0 15 1 25 Uncalibrated max 40 to 70 C 0 53 2 14 Exclusive of lead wire desensitization error Range equals 29 4 mV V Calibrated errors represent offset stability following unstrained measurement Errors include the effect of completion resistor tolerance and drift ...

Page 23: ...days after cal 5 C 1 year after cal 5 C Calibrated typ 25 C 5 C 0 02 0 08 0 14 Calibrated max 40 to 70 C 0 07 0 16 0 39 Uncalibrated typ 25 C 5 C 0 15 0 79 Uncalibrated max 40 to 70 C 0 53 1 67 Exclusive of lead wire desensitization error Range equals 29 4 mV V Calibrated errors represent offset stability following unstrained measurement Errors include the effect of completion resistor tolerance a...

Page 24: ...in 0 to 1 kHz 0 002 fin 0 to 4 kHz 0 1 Input delay 38 2 fs 11 μs Passband Frequency 0 45 fs Flatness fs 10 kS s 33 mdB max Stopband Frequency 0 55 fs Rejection 100 dB Input Signal Frequency fin Gain Phase Typical Maximum Maximum 0 to 1 kHz 0 08 0 11 0 34 kHz fin 0 to 4 kHz 0 17 0 32 ...

Page 25: ...e rate1 fs 10 kS s 80 dB 640 kHz Input noise fs 1 kS s NI 9235 0 38 μV Vrms NI 9236 0 25 μV Vrms fs 10 kS s NI 9235 0 85 μV Vrms NI 9236 0 5 μV Vrms SFDR 1 kHz 60 dBFS NI 9235 110 dB NI 9236 115 dB THD 1 kHz 20 dBFS NI 9235 90 dB NI 9236 95 dB 1 Rejection by analog prefilter of signal frequencies at oversample rate ...

Page 26: ... signals to earth ground 60 VDC CMRR fin 0 to 60 Hz NI 9235 120 dB NI 9236 110 dB MTBF 566 796 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 ...

Page 27: ...stance NI 9235 50 kΩ NI 9236 100 kΩ Output value NI 9235 599 28 μV V NI 9236 873 47 μV V Temperature drift 15 ppm C Method Shunt across completion resistor Measurement Conditions NI 9235 Percent of Reading Gain Error NI 9236 Percent of Reading Gain Error Typical 25 C 5 C 0 09 0 07 Maximum 40 to 70 C 0 22 0 2 ...

Page 28: ...onstant voltage Excitation value NI 9235 2 0 V 1 NI 9236 3 3 V 1 Maximum output current NI 9235 80 mA NI 9236 46 mA Power Requirements Power consumption from chassis NI 9235 Active mode 735 mW max Sleep mode 25 μW max NI 9236 Active mode 675 mW max Sleep mode 25 μW max ...

Page 29: ...x Sleep mode 25 μW max Physical Characteristics If you need to clean the module wipe it with a dry towel Spring terminal wiring 18 to 28 AWG copper conductor wire with 7 mm 0 28 in of insulation stripped from the end Weight 153 g 5 4 oz Safety Safety Voltages Connect only voltages that are within the following limits Between any two terminals 30 V max ...

Page 30: ...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 and electronics Caution Do not connect...

Page 31: ...N 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 by 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 ...

Page 32: ...he 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 ...

Page 33: ...oidal 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 ...

Page 34: ...aration 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 National Instruments is committed to designing and manufacturing products in an environmentally responsible manner NI ...

Page 35: ...ocument Waste Electrical and Electronic Equipment WEEE 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 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...

Page 36: ...ical 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 F...

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Page 38: ...he 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 For patents covering National Instruments products refer to the appropriate location Help Patents in your software the patents txt file on your media or ni com patents ...

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