National Instruments NI 9235 Uživatelský manuál

OPERATING INSTRUCTIONS AND SPECIFICATIONSNI 9235/92368-Channel, 24-Bit Quarter-Bridge Analog InputModuleni.com/manualsDeutschFrançais

NI 9235/9236 10 ni.comNI 9235/9236 CircuitryThe NI 9235/9236 is isolated from earth ground. However, the individual channels are not isolated from ea

© National Instruments Corp. 11 NI 9235/9236 Figure 5. Input Circuitry for One Channel of the NI 9235EXCAIRC+–BridgeCompletionResistorFiltered Differ

NI 9235/9236 12 ni.comFigure 6. Input Circuitry for One Channel of the NI 9236The NI 9235/9236 also includes filters to prevent aliasing. The filter

© National Instruments Corp. 13 NI 9235/9236 Quarter-bridge measurements are inherently sensitive to accuracy degradation due to the lead resistance o

NI 9235/9236 14 ni.comShunt calibration simulates strain input by changing the resistance of an arm in the bridge by a known amount. By shunting, or

© National Instruments Corp. 15 NI 9235/9236 Understanding NI 9235/9236 FilteringThe NI 9235/9236 uses a combination of analog and digital filtering t

NI 9235/9236 16 ni.comFigure 7. Typical Passband Response for the NI 9235/9236Frequency (kHz) 5 40.0250.000–0.025–0.050 3 210Gain (dB)

© National Instruments Corp. 17 NI 9235/9236 StopbandThe filter significantly attenuates all signals above the stopband frequency. The primary goal of

NI 9235/9236 18 ni.comthe modules must share a single master timebase source. Refer to the software help for information about configuring the master

© National Instruments Corp. 19 NI 9235/9236 Sleep ModeThis module supports a low-power sleep mode. Support for sleep mode at the system level depends

NI 9235/9236 2 ni.comThis document describes how to use the National Instruments 9235 and National Instruments 9236 and includes specifications and t

NI 9235/9236 20 ni.comSpecificationsThe following specifications are typical for the range –40 to 70 °Cunless otherwise noted. The specifications are

© National Instruments Corp. 21 NI 9235/9236 Data rate range (fs) using internal master timebaseMinimum... 794 S/sMax

NI 9235/9236 22 ni.comAccuracy, NI 9235Stability, NI 9235Gain drift... 6 ppm/°COffset drift... 2.

© National Instruments Corp. 23 NI 9235/9236 Accuracy, NI 9236Stability, NI 9236Gain drift... 6 ppm/°COffset drift...

NI 9235/9236 24 ni.comChannel-to-channel matching (calibrated)Phase nonlinearityfin = 0 to 1 kHz... ±0.002°fin = 0 to 4 kHz.

© National Instruments Corp. 25 NI 9235/9236 Alias-free bandwidth ...0.45 · fsOversample rate ... 64

NI 9235/9236 26 ni.comCrosstalk (fin = 1 kHz) ... –100 dBCommon-mode voltage,all signals to earth ground... ±60 VDCC

© National Instruments Corp. 27 NI 9235/9236 Shunt Calibration CharacteristicsShunt calibration accuracyResistanceNI 9235...

NI 9235/9236 28 ni.comExcitation CharacteristicsExcitation type ... Constant voltageExcitation valueNI 9235...

© National Instruments Corp. 29 NI 9235/9236 Thermal dissipation (at 70 °C)NI 9235Active mode ... 735 mW maxSleep mode...

© National Instruments Corp. 3 NI 9235/9236 Safety GuidelinesOperate the NI 9235/9236 only as described in these operating instructions.Hot Surface Th

NI 9235/9236 30 ni.comIsolationChannel-to-channel ... NoneChannel-to-earth groundContinuous ... 60 VDC, Meas

© National Instruments Corp. 31 NI 9235/9236 Safety StandardsThis product is designed to meet the requirements of the following standards of safety fo

NI 9235/9236 32 ni.comEnvironmentalNational Instruments C Series modules are intended for indoor use only but may be used outdoors if installed in a

© National Instruments Corp. 33 NI 9235/9236 Shock and VibrationTo meet these specifications, you must panel mount the system and use the NI 9965 back

NI 9235/9236 34 ni.comNote For EMC compliance, operate this device with shielded cabling.CE ComplianceThis product meets the essential requirements o

© National Instruments Corp. 35 NI 9235/9236 For additional environmental information, refer to the NI and the Environment Web page at ni.com/environm

NI 9235/9236 36 ni.comCalibrationYo u can obtain the calibration certificate and information about calibration services for the NI 9235/9236 at ni.co

© National Instruments Corp. 37 NI 9235/9236 and follow the calling instructions or dial 512 795 8248. For telephone support outside the United States

© 2008 National Instruments Corp. All rights reserved.374645A-01 Jun08National Instruments, NI, ni.com, and LabVIEW are trademarks of National Instrum

NI 9235/9236 4 ni.comCaution Substitution of components may impair suitability for Class I, Division 2.Caution For Zone 2 applications, install the s

© National Instruments Corp. 5 NI 9235/9236 Special Conditions for Marine ApplicationsSome modules are Lloyd’s Register (LR) Type Approved for marine

NI 9235/9236 6 ni.comConnecting the NI 9235/9236The NI 9235/9236 has a 24-terminal detachable spring-terminal connector that provides connections for

© National Instruments Corp. 7 NI 9235/9236 Yo u can connect a quarter-bridge sensor to each channel. Each channel has an EXC terminal that provides t

NI 9235/9236 8 ni.comConnecting Wires to the NI 9235/9236 ConnectorUse a flathead screwdriver with a blade smaller than 2.3 × 1.0 mm (0.09 × 0.04 in.

© National Instruments Corp. 9 NI 9235/9236 Wiring for High-Vibration ApplicationsIf an application is subject to high vibration, National Instruments