Page 2 - Note
NI 9235/9236 2 ni.com This doc u ment describes how to u se the National Instr u ments 9235 and National Instr u ments 9236 and incl u des specifications and terminal assignments. In this doc u ment, the NI 9235 and NI 9236 are referred to incl u sively as the NI 9235/9236. Visit ni.com/info and ent...
Page 3 - Safety Guidelines; Hot Surface; Safety Guidelines for Hazardous Locations; not; not
© National Instruments Corp. 3 NI 9235/9236 Safety Guidelines Operate the NI 9235/9236 only as described in these operating instr u ctions. Hot Surface This icon denotes that the component may be hot. To u ching this component may res u lt in bodily inj u ry. Safety Guidelines for Hazardous Location...
Page 4 - Special Conditions for Hazardous Locations Use in Europe
NI 9235/9236 4 ni.com Caution S u bstit u tion of components may impair s u itability for Class I, Division 2. Caution For Zone 2 applications, install the system in an enclos u re rated to at least IP 54 as defined by IEC 60529 and EN 60529. Caution For Zone 2 applications, connected signals m u st...
Page 5 - Special Conditions for Marine Applications
© National Instruments Corp. 5 NI 9235/9236 Special Conditions for Marine Applications Some mod u les 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 Regis...
Page 9 - Wiring for High-Vibration Applications
© National Instruments Corp. 9 NI 9235/9236 Wiring for High-Vibration Applications If an application is s u bject to high vibration, National Instr u ments recommends that yo u u se the NI 9965 backshell kit to protect the connections. Refer to Fig u re 4 for an ill u stration of the NI 9965 connect...
Page 12 - des filters to prevent aliasing. The
NI 9235/9236 12 ni.com Figure 6. Input Circuitry for One Channel of the NI 9236 The NI 9235/9236 also incl u des filters 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 abo u t ...
Page 13 - Shunt Calibration
© National Instruments Corp. 13 NI 9235/9236 Q u arter-bridge meas u rements are inherently sensitive to acc u racy degradation d u e to the lead resistance of wiring from the sensor to the meas u rement device. For a given change in the gage resistance, the total effective resistance changes slight...
Page 14 - Specifications; Excitation Voltage
NI 9235/9236 14 ni.com Sh u nt calibration sim u lates strain inp u t by changing the resistance of an arm in the bridge by a known amo u nt. By sh u nting, or connecting, a large resistor across one arm of the bridge, a specific change occ u rs in the bridge voltage ratio. With the connected sensor...
Page 15 - Passband
© National Instruments Corp. 15 NI 9235/9236 Understanding NI 9235/9236 Filtering The NI 9235/9236 u ses a combination of analog and digital filtering to provide an acc u rate representation of in-band signals while rejecting o u t-of-band signals. The filters discriminate between signals based on t...
Page 17 - Stopband
© National Instruments Corp. 17 NI 9235/9236 Stopband The filter significantly atten u ates all signals above the stopband freq u ency. The primary goal of the filter is to prevent aliasing. Therefore, the stopband freq u ency scales precisely with the data rate. The stopband rejection is the minim ...
Page 19 - Sleep Mode
© National Instruments Corp. 19 NI 9235/9236 Sleep Mode This mod u le s u pports a low-power sleep mode. S u pport for sleep mode at the system level depends on the chassis that the mod u le is pl u gged into. Refer to the chassis man u al for information abo u t s u pport for sleep mode. If the cha...
Page 20 - Input Characteristics
NI 9235/9236 20 ni.com Specifications The following specifications are typical for the range – 40 to 70 °C u nless otherwise noted. The specifications are the same for the NI 9235 and the NI 9236 u nless otherwise noted. Input Characteristics N u mber of channels .......................... 8 analog ...
Page 22 - Acc; Measurement Conditions
NI 9235/9236 22 ni.com Acc u racy, NI 9235 Stability, NI 9235 Gain drift .............................. 6 ppm/°COffset drift ............................ 2.2 μ V/V/°C Measurement Conditions Percent of Reading * (Gain Error) Percent of Range †, ‡ (Offset Error) 30 days after cal. ( ±5 °C) 1 year afte...
Page 25 - Rejection at oversample rate
© National Instruments Corp. 25 NI 9235/9236 Alias-free bandwidth ........................ 0.45 · f s Oversample rate ................................ 64 · f s Rejection at oversample rate 1 (f s = 10 kS/s) ..................................... 80 dB @ 640 kHz Inp u t noise f s = 1 kS/s NI 9235 .......
Page 26 - Bellcore Iss; Contact NI for Bellcore MTBF specifications
NI 9235/9236 26 ni.com Crosstalk ( f in = 1 kHz) ...................... –100 dB Common-mode voltage,all signals to earth gro u nd ................. ±60 VDC CMRR ( f in = 0 to 60 Hz) NI 9235....................................... 120 dBNI 9236....................................... 110 dB MTBF .........
Page 27 - Shunt Calibration Characteristics; Measurement
© National Instruments Corp. 27 NI 9235/9236 Shunt Calibration Characteristics Sh u nt calibration acc u racy Resistance NI 9235....................................... 50 k Ω NI 9236....................................... 100 k Ω O u tp u t val u e NI 9235....................................... –599...
Page 29 - Physical Characteristics; Safety Voltages
© National Instruments Corp. 29 NI 9235/9236 Thermal dissipation (at 70 °C) NI 9235 Active mode ......................... 735 mW maxSleep mode ........................... 25 μ W max NI 9236 Active mode ......................... 675 mW maxSleep mode ........................... 25 μ W max Physical Cha...
Page 30 - MAINS
NI 9235/9236 30 ni.com Isolation Channel-to-channel .................... NoneChannel-to-earth gro u nd Contin u o u s ........................... 60 VDC, Meas u rement Category I Withstand ............................. 1,000 V rms , verified by a 5 s dielectric withstand test Meas u rement Category ...
Page 31 - Safety Standards; Hazardous Locations
© National Instruments Corp. 31 NI 9235/9236 Safety Standards This prod u ct is designed to meet the req u irements of the following standards of safety for electrical eq u ipment for meas u rement, control, and laboratory u se: • IEC 61010-1, EN 61010-1 • UL 61010-1, CSA 61010-1 Note For UL and oth...
Page 32 - Environmental
NI 9235/9236 32 ni.com Environmental National Instr u ments C Series mod u les are intended for indoor u se only b u t may be u sed o u tdoors if installed in a s u itable enclos u re. Refer to the man u al for the chassis yo u are u sing for more information abo u t meeting these specifications. Op...
Page 33 - Shock and Vibration; Electromagnetic Compatibility
© National Instruments Corp. 33 NI 9235/9236 Shock and Vibration To meet these specifications, yo u m u st panel mo u nt the system and u se the NI 9965 backshell to protect the connections. Operating vibration Random (IEC 60068-2-64)......... 5 g rms , 10 to 500 Hz Sin u soidal (IEC 60068-2-6) .......
Page 34 - CE Compliance; Environmental Management
NI 9235/9236 34 ni.com Note For EMC compliance, operate this device with shielded cabling. CE Compliance This prod u ct meets the essential req u irements of applicable E u ropean directives, as amended for CE markings, as follows: • 2006/95/EC; Low-Voltage Directive (safety) • 2004/108/EC; Electrom...
Page 35 - NI and the; Waste Electrical and Electronic Equipment (WEEE); EU Customers; must; RoHS; National Instruments; about China RoHS compliance, go to
© National Instruments Corp. 35 NI 9235/9236 For additional environmental information, refer to the NI and the Environment Web page at ni.com/environment . This page contains the environmental reg u lations and directives with which NI complies, as well as other environmental information not incl u ...
Page 36 - Calibration; Where to Go for Support
NI 9235/9236 36 ni.com Calibration Yo u can obtain the calibration certificate and information abo u t calibration services for the NI 9235/9236 at ni.com/ calibration . Calibration interval ........................... 1 year Where to Go for Support The National Instr u ments Web site is yo u r comp...
