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NI 9242 User Manual and Specifications

Connecting Single-Phase Measurement 
Configurations

You can connect 3-wire or 2-wire single-phase measurement 

configurations to the NI 9242.

Figure 11.  

Connecting a 3-Wire Measurement (Split Phase) 

Configuration

NI 9242

AI0

Ne

u

tr

a

l

AI1

Summary of Contents for NI 9242

Page 1: ...USER MANUAL AND SPECIFICATIONS NI 9242 4 Channel 250 Vrms 24 Bit Simultaneous Analog Input Module ni com manuals Deutsch Français ...

Page 2: ...cific to the NI 9242 The other components in the system might not meet the same safety ratings and specifications Refer to the documentation for each component in the system to determine the safety ratings and specifications for the entire system Related Information Services ni com services NI CompactDAQ NI CompactRIO Documentation ni com info cseriesdoc ni com info softwareversion Chassis Compati...

Page 3: ...nent may result in bodily injury Warning This icon denotes a warning advising you to take precautions to avoid electrical shock Caution Do not operate the NI 9242 in a manner not specified in this manual Product misuse can result in a hazard You can compromise the safety protection built into the product if the product is damaged in any way If the product is damaged return it to National Instrumen...

Page 4: ...ersonnel adhering to local electrical standards Caution Do not mix hazardous voltage circuits and human accessible circuits on the same module Caution Make sure that devices and circuits connected to the module are properly insulated from human contact Caution When module terminals are hazardous voltage LIVE 42 4Vpk 60 VDC you must ensure that devices and circuits connected to the module are prope...

Page 5: ...NI 9242 User Manual and Specifications National Instruments 5 Figure 1 shows the NI 9967 connector backshell Figure 1 NI 9967 Connector Backshell ...

Page 6: ...entially 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 or the area is known to be nonhazardous Caution Do not remove modules unless power has been switched off or the area is known to be nonhazardous Caution Substitution of components may impair suitability for Cla...

Page 7: ...ures of 40 C Ta 70 C If you are using the NI 9242 in Gas Group IIC hazardous locations you must use the device in an NI chassis that has been evaluated as Ex nC IIC T4 EEx nC IIC T4 Ex nA IIC T4 or Ex nL IIC T4 equipment Caution The system shall be mounted in an ATEX certifiedenclosurewithaminimumingressprotectionrating of at least IP54 as defined in IEC EN 60529 and used in an environment of not ...

Page 8: ...intended for use in industrial locations There is no guarantee that harmful interference will not occur in a particular installation when the product is connected to a test object or if the product is used in residential areas To minimize the potential for the product to cause interference to radio and television reception or to experience unacceptable performance degradation install and use this ...

Page 9: ... visit ni com certification and search for the LR certificate or look for the Lloyd s Register mark on the product label Caution In order to meet the EMC requirements for marine applications install the product in a shielded enclosure with shielded and or filtered power and input output ports In addition take precautions when designing selecting and installing measurement probes and cables to ensu...

Page 10: ...10 ni com NI 9242 User Manual and Specifications Connecting the NI 9242 The NI 9242 provides connections for four analog input channels Figure 2 NI 9242 Pinout AI0 AI1 AI2 Neutral 0 1 2 3 ...

Page 11: ...nector Backshell Caution For safe operation with hazardous voltages you must use the NI 9967 Connector Backshell as shown in Figure 1 with the 4 terminal connector on the NI 9242 You can use the backshell with 12 AWG to 24 AWG wires with the NI 9967 12 AWG to 14 AWG 16 AWG and 18 AWG to 24 AWG require different strain relief pieces ...

Page 12: ...sing 12 AWG to 14 AWG Wire Complete the following steps to install the NI 9967 using 12 AWG to 14 AWG wires Figure 3 12 AWG to 14 AWG Installation 1 Route wires over the strain relief piece 2 Secure strain relief piece and NI 9967 backshell in place using captive screws 1 2 ...

Page 13: ...alling the NI 9967 Using 16 AWG Wire Complete the following steps to install the NI 9967 using 16 AWG wires Figure 4 16 AWG Installation 1 Route wires through the strain relief pieces 2 Secure strain relief piece and NI 9967 backshell in place using captive screws 1 2 ...

Page 14: ...967 Using 18 AWG to 24 AWG Wire Complete the following steps to install the NI 9967 using 16 AWG wires Figure 5 18 AWG to 24 AWG Installation 1 Route wires over the strain relief piece 2 Secure strain relief piece and NI 9967 backshell in place using captive screws 1 2 ...

Page 15: ...tandard potential transformers to the NI 9242 Note You must use 2 wire ferrules to create a secure connection when connecting more than one wire to a single terminal on the NI 9242 Circuitry Each channel on the NI 9242 provides an independent signal path and ADC Each terminal has the same input impedance to ground The NI 9242 returns the voltage between each AI terminal and the Neutral terminal as...

Page 16: ...To ensure that measurements to chassis ground are correct NI recommends connecting the chassis to earth ground using the chassis grounding screw Refer to your chassis manual for information about connecting the chassis to earth ground NI 9242 AI1 AI2 Neutral GND Neutral AI0 AI1 AI2 AI0 V V V V ...

Page 17: ...three phase measurement configurations and single phase measurement configurations to the NI 9242 NI recommends using the following phase measurement configurations for typical power distribution networks Other valid configurations are possible if the connections do not exceed the safety rating of the NI 9242 ...

Page 18: ...tions Connecting Three Phase Measurement Configurations You can connect WYE or delta measurement configurations to the NI 9242 Figure 7 Connecting a 4 Wire WYE Measurement Configuration NI 9242 AI0 Phase A Phase B Phase C Neutral Neutral AI2 AI1 ...

Page 19: ...NI 9242 User Manual and Specifications National Instruments 19 Figure 8 Connecting a High Leg Delta Measurement Configuration NI 9242 AI0 Phase A Phase B Phase C Neutral AI2 AI1 Neutral ...

Page 20: ...20 ni com NI 9242 User Manual and Specifications Figure 9 Connecting a 3 Wire Delta Measurement Configuration NI 9242 AI0 Phase A Phase B Phase C AI2 AI1 ...

Page 21: ...struments 21 Figure 10 Connecting a Corner Grounded 2 Wire Delta Measurement Configuration Note Corner grounded 2 wire delta measurement configurations support only standard service levels up to 240 Vrms L L NI 9242 AI0 Phase A Phase B Phase C AI2 AI1 ...

Page 22: ...fications Connecting Single Phase Measurement Configurations You can connect 3 wire or 2 wire single phase measurement configurations to the NI 9242 Figure 11 Connecting a 3 Wire Measurement Split Phase Configuration NI 9242 AI0 Neutral AI1 ...

Page 23: ...otential transformers to the NI 9242 Tip When measuring voltages using potential transformers scale the NI 9242 readings with your application software using the transformer ratio to get readings that refer to the primary of the potential transformers For example if using a 320 1 ratio potential transformer multiply the readings by 320 NI 9242 AI0 Neutral ...

Page 24: ...24 ni com NI 9242 User Manual and Specifications Figure 13 4 Wire WYE to WYE Full AI0 AI1 AI2 N Phase A Phase B Phase C Neutral NI 9242 ...

Page 25: ...asures the neutral to ground voltage through the bottom transformer You can use a lower ratio transformer due to the typically low voltages on the Neutral terminal Ensure that you scale each NI 9242 channel reading with the corresponding transformer ratio Figure 14 4 Wire WYE to WYE Partial AI0 AI1 AI2 N Phase A Phase B Phase C Neutral NI 9242 ...

Page 26: ...tial transformer to reduce noise between the potential transformer ground and the chassis ground Connect the Neutral terminal of the NI 9242 as close as possible to the isolated ground of the potential transformer Use the L N voltage measurements the NI 9242 returns as the default value Tip You can convert L N voltage measurements to channel to earth ground by adding the Neutral terminal measureme...

Page 27: ...ational Instruments 27 Figure 15 Delta to Delta Tip You can use the Neutral channel for any other measurement if the measurement does not exceed the Neutral to Earth and L N input range 1 Optional AI0 AI1 AI2 Phase A Phase B Phase C NI 9242 1 ...

Page 28: ...28 ni com NI 9242 User Manual and Specifications Figure 16 Delta to WYE AI0 AI1 AI2 N Phase A Phase B Phase C NI 9242 ...

Page 29: ...tial transformer to reduce noise between the potential transformer ground and the chassis ground Connect the Neutral terminal of the NI 9242 as close as possible to the isolated ground of the potential transformer Use the L N voltage measurements the NI 9242 returns as the default value Tip You can convert L N voltage measurements to channel to earth ground by adding the Neutral terminal measureme...

Page 30: ... and Specifications Figure 17 3 Wire WYE to Delta Tip You can use the Neutral channel for any other measurement if the measurement does not exceed the Neutral to Earth and L N input range AI0 AI1 AI2 Phase A Phase B Phase C NI 9242 ...

Page 31: ... WYE to WYE configurations follow these guidelines for the best accuracy results Connect the Neutral terminal of the NI 9242 to the isolated ground of the potential transformer to reduce noise between the potential transformer ground and the chassis ground AI0 AI1 AI2 N Phase A Phase B Phase C NI 9242 ...

Page 32: ...age measurements to channel to earth ground by adding the Neutral terminal measurement to each of the AI channels Converting L N Measurements to L L To convert L N measurements to L L values calculate the voltage difference between the AI channels using your application software Refer to the following equation for an example of converting L N measurements to L L Phase A to Phase B Voltage AI0 AI1 ...

Page 33: ...To convert L N measurements to L Earth values add the neutral channel reading to each AI channel reading Refer to the following equation for an example of converting L N measurements to L Earth Line to Earth AIx Neutral where AIx is the analog input channel reading Neutral is the Neutral channel reading ...

Page 34: ...ns If an application is subject to high vibration National Instruments recommends that you use ferrules to terminate wires to the detachable screw terminal connector Refer to Figure 19 for an illustration of using ferrules Figure19 4 TerminalDetachableScrew TerminalConnectorwithFerrule ...

Page 35: ... within the passband as quantified primarily by passband ripple 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 frequenc...

Page 36: ...above the stopband frequency The primary goal of the filter is to prevent aliasing Therefore the stopband frequency scales precisely with the data rate The stopband rejection is the minimumamountof attenuationapplied by the filter to all signals with frequencies within the stopband Frequency Data Rate Hz 0 5 0 4 0 025 0 000 0 025 0 050 0 3 0 2 0 1 0 Gain dB ...

Page 37: ...a Rates The frequency of a master timebase fM controls the data rate fs of the NI 9242 The NI 9242 includes an internal master timebase with a frequency of 12 8 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 9242 with other modules that use master timebases to control sampling all of the modules must share a si...

Page 38: ...cifications 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 50 kS s 25 kS s 16 667 kS s and so on down to 1 613 kS s depending on the value of n When using an external timebase with a frequency other than 12 8 MHz the NI 9242 has a different set of data rates Note The NI 9151 R Series Expansion chassis does not ...

Page 39: ...ts sleep mode refer to the software help for information about enabling sleep mode 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 Related Information Power Requirements Specifications The following specifications are typical for the range 40 C to 70 C unless oth...

Page 40: ...ency 12 8 MHz Accuracy 100 ppm max Data rate range fs using internal master timebase Minimum 1 613 kS s Maximum 50 kS s Data rate range fs using external master timebase Minimum 390 625 S s Maximum 51 2 kS s Data rates1 fs n 1 2 31 1 The data rate must remain within the appropriate data rate range Refer to the Understanding NI 9242 Data Rates section for more information fM 256 n ...

Page 41: ...for 10 s Surge withstand 5 kV 1 2 µs 50 µs Input coupling DC Input impedance AIx to Ground and Neutral to GND 1 MΩ Table 1 DC and AC Accuracy Measurement Conditions Percent of Reading Gain Error Percent of Range Offset Error Calibrated max 40 C to 70 C 0 26 0 14 Calibrated typ 23 C 5 C 0 05 0 022 Uncalibrated max 40 C to 70 C 0 50 0 26 Uncalibrated typ 23 C 5 C 0 18 0 06 Range equals 354 V 250 Vrm...

Page 42: ... over one or several power cycles the noise of the measurement reduces significantly theoretically with the square root of the number of samples in the acquisition window Nonlinearity at 25 C 20 ppm Stability Gain drift 12 1 ppm C Offset drift 3 4 mV C 1 The NI 9242 returns L N and N Earth values only Refer to Converting L N Measurements to L L and Converting L N Measurements to L Earth sections f...

Page 43: ...0 kHz 44 mdB Up to 3 8 kHz 30 mdB Phase mismatch channel to channel 0 138 kHz max Phase mismatch module to module max 0 138 kHz 360 fin fM Phase nonlinearity fs 50 kS s 0 kHz to 10 kHz 0 017 max 0 kHz to 20 kHz 0 034 max Input delay 40 fs 1 5 µs Passband Frequency 0 453 fs Flatness 0 kHz to 20 kHz 50 mdB max 0 kHz to 10 kHz 20 mdB max 5 512 ...

Page 44: ...and 60 Hz At 5 unbalance Maximum 0 21 Typical 0 09 At 1 unbalance Maximum 0 22 Typical 0 1 Zero phase sequence error at 50 Hz and 60 Hz At 5 unbalance Maximum 0 21 Typical 0 09 At 1 unbalance Maximum 0 22 Typical 0 1 Stopband Frequency 0 547 fs Rejection 95 dB Alias free bandwidth 0 453 fs ...

Page 45: ... 60 Hz 105 dB 1 kHz 79 dB CMRR fin 60 Hz 75 dB SFDR 1 kHz 60 dBFS 120 dB Total Harmonic Distortion THD up to 1 kHz 100 dB MTBF Contact NI for Bellcore MTBF or MIL HDBK 217F specifications Power Requirements Power consumption from chassis Active mode 332 mW max Sleep mode 50 µW max Thermal dissipation Active mode 582 mW max Sleep mode 250 mW max ...

Page 46: ...imensional models of the C Series module and connectors visit ni com dimensions and search by module number Screw terminal wiring 0 511 mm diameter 24 AWG to 2 053 mm diameter 12 AWG copper conductor wire with 7 mm 0 28 in of insulation stripped from the end Torque for screw terminals 0 5 N m to 0 6 N m 4 42 lb in to 5 30 lb in Ferrules 0 25 mm2 to 2 5 mm2 Weight 150 g 5 3 oz ...

Page 47: ...surement Category III is for measurements performed in the building installation at the distribution level This category refers to measurements on hard wired hardware such as hardware in fixed installations distribution boards and circuit breakers Other examples are wiring including cables bus bars junction boxes switches socket outlets in the fixed installation and stationary motors with permanen...

Page 48: ...ups A B C D T4 Class I Zone 2 Ex nA IIC T4 Europe DEMKO Ex nA IIC T4 Gc Safety and Hazardous Locations Standards This product meets the requirements of the following standards of safety for electrical equipment for measurement control and laboratory use IEC 61010 1 EN 61010 1 UL 61010 1 CSA 61010 1 EN 60079 0 2009 EN 60079 15 2010 IEC 60079 0 2007 Ed 5 IEC 60079 15 2010 Ed 4 ...

Page 49: ...ic Compatibility This product meets the requirements of the following EMC standards for electrical equipment for measurement control and laboratory use EN 61326 1 IEC 61326 1 Class A emissions Industrial immunity EN 55011 CISPR 11 Group 1 Class A emissions EN 55022 CISPR 22 Class A emissions EN 55024 CISPR 24 Immunity AS NZS CISPR 11 Group 1 Class A emissions AS NZS CISPR 22 Class A emissions FCC ...

Page 50: ...cations Note Group 1 equipment per CISPR 11 is any industrial scientific or medical equipment that does not intentionally generates radio frequency energy for the treatment of material or inspection analysis purposes Note For EMC declarations and certifications refer to the Online Product Certification section CE Compliance This product meets the essential requirements of applicable European Direc...

Page 51: ...the appropriate link in the Certification column Shock and Vibration To meet these specifications you must panel mount the system If you are using the NI 9242 with screw terminal you also must either affix ferrules to the ends of the terminal wires Operating vibration Random IEC 60068 2 64 5 grms 10 Hz to 500 Hz Sinusoidal IEC 60068 2 6 5 g 10 Hz to 500 Hz Operating shock IEC 60068 2 27 30 g 11 ms...

Page 52: ...g these specifications Operating temperature IEC 60068 2 1 IEC 60068 2 2 40 C to 70 C Storage temperature IEC 60068 2 1 IEC 60068 2 2 40 C 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 Pollution Degree 2 Maximum altitude 5 000 m Indoor use only ...

Page 53: ...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 For more information abou...

Page 54: ...l 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 Visit ni com services for NI Factory Installation Services repairs extended warranty and other services 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ᗻ...

Page 55: ...n the DoC for your product by visiting ni com certification If your product supports calibration you can obtain the calibration certificate for your product at ni com calibration National Instruments corporate headquarters is located at 11500 North Mopac Expressway Austin Texas 78759 3504 National Instruments also has offices located around the world For telephone support in the United States crea...

Page 56: ...tional Instruments products technology refer to the appropriate location Help Patents in your software the patents txt file on your media or the National Instruments Patent Notice at ni com patents You can find end user license agreements EULAs and third party legal notices in the readme file for your NI product Refer to the Export Compliance Information at ni com legal export compliance for the N...

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