National Instruments NI 9237 - Manuals

© National Instruments Corp. 5 NI 9237 Operating Instructions and Specifications 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 certi...

NI 9237 Operating Instructions and Specifications 6 ni.com Connecting the NI 9237 The NI 9237 has fo u r RJ-50 receptacles that provide connections for fo u r half or f u ll bridges. Figure 1. NI 9237 Pin Assignments SC AI+AI–RS+RS–EX+EX–T+T–SC 123456789 10 Ch0 – Ch3 EX+ EX+ EX– EX– Ch 0 Ch 1 Ch 2 C...

NI 9237 Operating Instructions and Specifications 10 ni.com Each channel on the NI 9237 has an independent 24-bit ADC and an inp u t amplifier that enable yo u to sample signals from all fo u r channels sim u ltaneo u sly. The NI 9237 is isolated from earth gro u nd. However, the individ u al channe...

© National Instruments Corp. 11 NI 9237 Operating Instructions and Specifications Wiring TEDS Channels Ens u re that neither the TEDS data (T+) nor the TEDS ret u rn (T–) signal is tied in common to any AI signals on the NI 9237. The NI 9237 connects all the T– signals together internally. Visit ni....

NI 9237 Operating Instructions and Specifications 12 ni.com circ u it. Refer to Fig u re 3 for an ill u stration of how to connect remote sense wires to the NI 9237. Figure 3. Connecting Remote Sense Wires to the NI 9237 EX+ EX– RS+ RS– R bridge R lead R lead R bridge R bridge R bridge NI 9237 AI– A...

© National Instruments Corp. 13 NI 9237 Operating Instructions and Specifications The act u al bridge excitation voltage is smaller than the voltage at the EX+ and EX– leads. If yo u do not u se remote sensing of the act u al bridge voltage, the res u lting gain error is: for half-bridge sensors and...

© National Instruments Corp. 15 NI 9237 Operating Instructions and Specifications Excitation Voltages Altho u gh the sensor ind u stry does not recognize a single standard excitation voltage level, excitation voltage levels of between 2.5 V and 10 V are common. Yo u can program the NI 9237 to s u pp...

NI 9237 Operating Instructions and Specifications 16 ni.com The 150 mW limit allows yo u to power half and f u ll bridges as follows: • Fo u r 350 Ω half bridges at 5.0 V • Fo u r 350 Ω f u ll bridges at 3.3 V • Fo u r 120 Ω half bridges at 2.5 V If yo u need an excitation voltage that ca u ses more...

© National Instruments Corp. 17 NI 9237 Operating Instructions and Specifications or signals that have been filtered by at least the amo u nt of the stopband rejection. Passband The signals within the passband have freq u ency-dependent gain or atten u ation. The small amo u nt of variation in gain ...

NI 9237 Operating Instructions and Specifications 18 ni.com Figure 4. Typical Passband Flatness for the NI 9237 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...

© National Instruments Corp. 19 NI 9237 Operating Instructions and Specifications rate. The stopband rejection is the minim u m amo u nt of atten u ation applied by the filter to all signals with freq u encies within the stopband. Alias-Free Bandwidth Any signal that appears in the alias-free bandwi...

NI 9237 Operating Instructions and Specifications 20 ni.com The following eq u ation provides the available data rates of the NI 9237: f s = where n is any integer from 1 to 31. However, the data rate m u st remain within the appropriate data rate range. Refer to the Specifications section for more ...

© National Instruments Corp. 21 NI 9237 Operating Instructions and Specifications s u pport for sleep mode. If the chassis s u pports sleep mode, refer to the software help for information abo u t enabling sleep mode. Visit ni.com/info and enter c s erie s doc for information abo u t C Series doc u ...

© National Instruments Corp. 23 NI 9237 Operating Instructions and Specifications Overvoltage protectionbetween any two pins........................ ±30 V Acc u racy Gain drift........................................... 10 ppm/°C max Offset drift 2.5 V excitation .......................... 0.6 μ V/V...

© National Instruments Corp. 25 NI 9237 Operating Instructions and Specifications Rejection at oversample rate 1 f s = 10 kS/s.................................. 60 dB @ 640 kHz f s = 50 kS/s.................................. 90 dB @ 3.2 MHz Common-mode voltage,all signals to earth gro u nd ............

NI 9237 Operating Instructions and Specifications 26 ni.com Inp u t noise Excitation noise ................................ 0.1 mV/V rms Crosstalk f in = 1 kHz................................... 110 dB f in = 10 kHz................................. 100 dB Excitation Internal voltage ...................

© National Instruments Corp. 27 NI 9237 Operating Instructions and Specifications Sh u nt calibration Resistance ................................... 100 k Ω Resistor acc u racy 25°C ..................................... ±110 Ω –40 to 70°C .......................... ±200 Ω MTBF .........................

NI 9237 Operating Instructions and Specifications 28 ni.com Physical Characteristics If yo u need to clean the mod u le, wipe it with a dry towel. Weight ............................................... 152 g (5.4 oz) Safety Safety Voltages Connect only voltages that are within the following limits. ...

© National Instruments Corp. 29 NI 9237 Operating Instructions and Specifications meas u rements of voltages from specially protected secondary circ u its. S u ch voltage meas u rements incl u de signal levels, special eq u ipment, limited-energy parts of eq u ipment, circ u its powered by reg u lat...

NI 9237 Operating Instructions and Specifications 30 ni.com Safety Standards This prod u ct meets 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 ot...

© National Instruments Corp. 31 NI 9237 Operating Instructions and Specifications Note For the standards applied to assess the EMC of this prod u ct, refer to the Online Product Certification section. Note For EMC compliance, operate this device with shielded cabling. CE Compliance This prod u ct me...

NI 9237 Operating Instructions and Specifications 32 ni.com Shock and Vibration To meet these specifications, yo u m u st panel mo u nt the system. Operating vibration Random (IEC 60068-2-64)......... 5 g rms , 10 to 500 Hz Sin u soidal (IEC 60068-2-6) ....... 5 g, 10 to 500 Hz Operating shock(IEC 6...

© National Instruments Corp. 33 NI 9237 Operating Instructions and Specifications Operating h u midity (IEC 60068-2-56).............................. 10 to 90% RH, noncondensing Storage h u midity (IEC 60068-2-56).............................. 5 to 95% RH, noncondensing Maxim u m altit u de............

NI 9237 Operating Instructions and Specifications 34 ni.com Waste Electrical and Electronic Equipment (WEEE) EU Customers At the end of the life cycle, all prod u cts must be sent to a WEEE recycling center. For more information abo u t WEEE recycling centers and National Instr u ments WEEE initiati...

© National Instruments Corp. 35 NI 9237 Operating Instructions and Specifications Where to Go for Support The National Instr u ments Web site is yo u r complete reso u rce for technical s u pport. At ni.com/ s upport yo u have access to everything from tro u bleshooting and application development s...