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NI 9234E Operating Instructions and Specifications

NI 9234E Circuitry

The NI 9234E analog input channels are referenced to chassis
ground through a 50

Ω

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 9234E.

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Содержание NI 9234E

Страница 1: ...OPERATING INSTRUCTIONS AND SPECIFICATIONS NI 9234E 4 Channel 5 V 24 Bit Software Selectable IEPE and AC DC Analog Input Module ...

Страница 2: ...nformation about C Series documentation Caution National Instruments makes no electromagnetic compatibility EMC or CE marking compliance claims for the NI 9234E The end product supplier is responsible for conformity to any and all compliance requirements Caution The NI 9234E must be installed inside a suitable enclosure prior to use Hazardous voltages may be present Caution Do not operate the NI 9...

Страница 3: ...Instruments 3 NI 9234E Dimensions The following figure shows the dimensions of the NI 9234E Figure 1 NI 9234E Dimensions in Millimeters Inches 73 38 2 889 4x Ø 3 18 0 125 7 33 0 289 0 00 0 000 0 00 0 000 7 62 0 300 39 37 1 550 52 96 2 085 66 04 2 600 87 43 3 442 ...

Страница 4: ...ctions and Specifications Connecting the NI 9234E The NI 9234E has four BNC connectors that provide connections to four simultaneously sampled analog input channels Figure 2 NI 9234E Connector Assignments AI0 AI0 AI1 AI1 AI2 AI2 AI3 AI3 ...

Страница 5: ...ence Connecting Signal Sources to the NI 9234E You can connect ground referenced or floating signal sources to the NI 9234E 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 an...

Страница 6: ...s and Specifications Refer to Figures 3 and 4 for illustrations of connecting grounded and floating signal sources to the NI 9234E Figure 3 Connecting a Grounded Signal Source to the NI 9234E NI 9234E AI AI Signal Source Common Mode Voltage ...

Страница 7: ...n 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 9234E results in a floating connection even though the case of the sensor is grounded NI 9234E AI AI Signal Source ...

Страница 8: ...s 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 channel...

Страница 9: ...ses an error that is dependent on the AI lead impedance This error is approximately 50 ppm of range and 15 ppm of reading per Ω 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 2 mA IEPE on off AI AI A...

Страница 10: ...NI 9234E Filtering The NI 9234E 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 NI 9234E AI AI Signal Sou...

Страница 11: ...e 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 9234E adjust the frequency range of the passband to match the data rate Therefore the amount of gain or attenuation at a gi...

Страница 12: ...sband Flatness 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 Frequency Data Rate 0 5 0 4 0 025 0 000 0 025 0 050 0 3 0 2 0 1 0 Gain dB ...

Страница 13: ... to the data rate minus the stopband frequency Understanding NI 9234E Data Rates The frequency of a master timebase fM controls the data rate fs of the NI 9234E The NI 9234E 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 9234E with other modules t...

Страница 14: ...cifications section for more information about the data rate range When using the internal master timebase of 13 1072 MHz 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 using an external timebase with a frequency other than 13 1072 MHz the NI 9234E has a different set of data rates Note The cRIO 9151 R Series Expansion chas...

Страница 15: ...r 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 S...

Страница 16: ...herwise noted Input Characteristics Number of channels 4 analog input channels ADC resolution 24 bits Type of ADC Delta Sigma with analog prefiltering Sampling mode Simultaneous Type of TEDS supported IEEE 1451 4 TEDS Class I Internal master timebase fM Frequency 13 1072 MHz Accuracy 50 ppm max Data rate range fs using internal master timebase Minimum 1 652 kS s Maximum 51 2 kS s ...

Страница 17: ...r timebase Minimum 0 391 kS s Maximum 52 734 kS s Data rates1 fs n 1 2 31 Input coupling AC DC software selectable AC cutoff frequency 3 dB 0 5 Hz 0 1 dB 4 6 Hz max 1 The data rate must remain within the appropriate data rate range Refer to the Understanding NI 9234E Data Rates section for more information fM 256 n ...

Страница 18: ...18 ni com NI 9234E Operating Instructions and Specifications AC cutoff frequency response Input range 5 V Frequency Hz 10 4 0 5 0 0 0 5 1 0 3 2 1 0 9 8 7 6 5 Gain dB ...

Страница 19: ...nal Instruments 19 AC voltage full scale range Minimum 5 Vpk Typical 5 1 Vpk Maximum 5 2 Vpk Common mode voltage range AI to earth ground 2 V max IEPE excitation current software selectable on off Minimum 2 0 mA Typical 2 1 mA Power on glitch 90 μA for 10 μs ...

Страница 20: ...ge range Vcommon mode Vbias Vfull scale must be 0 to 19 Overvoltage protection with respect to chassis ground For a signal source connected to AI and AI 30 V For a low impedance source connected to AI and AI 6 V to 30 V Input delay 40 0 fs 3 2 μs where Vcommon mode is the common mode voltage applied to the NI 9234E Vbias is the bias voltage of the IEPE sensor Vfull scale is the full scale voltage ...

Страница 21: ...ement Conditions Percent of Reading Gain Error Percent of Range Offset Error Calibrated max 40 C to 85 C 0 34 0 03 dB 0 14 7 1 mV Calibrated typ 25 C 5 C 0 05 0 005 dB 0 006 0 3 mV Uncalibrated max 40 C to 85 C 1 9 0 16 dB 0 27 13 9 mV Uncalibrated typ 25 C 5 C 0 48 0 04 dB 0 04 2 3 mV Local ambient temperature Refer to the Environmental section for more information about operatingtemperatures Ran...

Страница 22: ...dB C 52 ppm C Offset drift Typical 19 2 μV C Maximum 118 μV C Channel to channel matching Gain Typical 0 01 dB Maximum 0 04 dB Phase fin in kHz fin 0 045 0 04 max Passband Frequency 0 45 fs Flatness fs 51 2 kS s 40 mdB pk to pk max Phase nonlinearity fs 51 2 kS s 0 45 max Stopband Frequency 0 55 fs Rejection 100 dB ...

Страница 23: ...1 kHz 110 dB CMRR fin 1 kHz Minimum 40 dB Typical 47 dB SFDR fin 1 kHz 60 dBFS 120 dB Idle channel noise and noise density Input impedance Differential 305 kΩ AI shield to chassis ground 50 Ω Idle Channel 51 2 kS s 25 6 kS s 2 048 kS s Noise 97 dBFS 99 dBFS 103 dBFS 50 μVrms 40 μVrms 25 μVrms Noise density 310 nV Hz 350 nV Hz 780 nV Hz ...

Страница 24: ...8 kHz 4 1 amplitude ratio 80 dB CCIF 11 kHz 12 kHz 1 1 amplitude ratio 93 dB MTBF 390 362 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 Input Amplitude 1 kHz 8 kHz 1 dBFS 95 dB 87 dB 20 dBFS 95 dB 80 dB ...

Страница 25: ...ssipation at 85 C Active mode 930 mW max Sleep mode 25 μW max Physical Characteristics Use a dry low velocity stream of air to clean the module If needed use a soft bristle brush for cleaning around components Note For two dimensional drawings and three dimensional models of the C Series module and connectors visit ni com dimensions and search by module number Weight 71 g 2 5 oz ...

Страница 26: ...t 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 parts of equipment circuits powered by regulated low voltage sources...

Страница 27: ...n installed in a suitable enclosure IEC 61010 1 EN 61010 1 UL 61010 1 CSA 61010 1 Note For UL and other safety certifications refer to the product label or the Online Product Certification section Online Product Certification To obtain product certifications and the Declaration of Conformity DoC for this product visit ni com certification search by model number or product line and click the approp...

Страница 28: ...m info and enter the Info Code sbRIOcooling for information about NI sbRIO system operating temperatures Storage temperature IEC 60068 2 1 IEC 60068 2 2 40 C to 85 C Operating humidity IEC 60068 2 56 10 to 90 RH noncondensing Storage humidity IEC 60068 2 56 5 to 95 RH noncondensing Pollution Degree 2 1 Local ambient temperature Measure the local ambient temperature by placing thermocouples on both...

Страница 29: ... information refer to the Minimize Our Environmental Impact 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 Waste Electrical and Electronic Equipment WEEE EU Customers At the end of the product life cycle all products must be sent to a WEEE recycling center...

Страница 30: ...ruments 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 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 environment rohs_chinaǄ For informa...

Страница 31: ...license agreements EULAs and third party legal notices in the NI RIO Readme Refer to the Export Compliance Information at ni com legal export compliance for the National Instruments global trade compliance policy and how to obtain relevant HTS codes ECCNs and other import export data National Instruments corporate headquarters is located at 11500 North Mopac Expressway Austin Texas 78759 3504 Nati...

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