LVDT / RVDT Measurement, 4-CH

LVDT / RVDT Measurement, 4-CH

See LD-X for newest architecture.


The linear variable differential transformer (LVDT) is a type of electrical transformer/transducer used for measuring linear displacement (position). A counterpart to this device that is used for measuring rotary displacement is called a rotary variable differential transformer (RVDT). Both types provide output signals (voltages) based upon an AC excitation source causing a magnetic flux generated on transformer secondary(ies) by a moveable core proportional to the linear displacement position being gauged.

NAI offers multichannel programmable, isolated excitation and signal input, LVDT/RVDT measurement LVDT / RVDT function modules, for all the multifunction intelligent I/O cards and platforms. Covering the range of excitation voltages/ frequency, interfacing to either two, three or four wire transducers and providing a normalized digital position word based on a percentage of full scale travel, the function modules are able to interface to virtually any type LVDT or RVDT. All LVDT / RVDT modules feature background wrap-around self-test capability and most platforms support an optional programmable AC excitation supply. Utilizing state-of-the-art technologies and specialized design algorithms, many useful application features such as excitation voltage and frequency measurement, excitation loss detection and many others are “built-in." Full scale operating signal and excitation voltages/frequency between 2-28 VRMS / 47 Hz and 10 kHz can be specified (see part number). Individual excitation inputs are supplied for each channel input.


Click below for manuals and specifications:

L*LVDT (Module L*) - Four LVDT Measurement Channels (2, 3 or 4 Wire)N/AContact Factory at 1 (631) 567-1100

Function module(s) featured in products below:

ModelBoard TypeFunction Module SlotsBoard ArchitectureSizeOn Board ReferenceEthernetOtherMaster / Slave
76C2PCI3 1/2N/A    
64C3VME6BF533 / Cyclone® III Y2 x Gb Both 
64C2VME 6BF533 / Cyclone® II Y1 x Gb Slave 
64CS4VME5BF533 / Cyclone® II Y1 x GbHigh power D/S capableSlave 
76CS3PCI5 FullY High power D/S capable  
79C3PCIe3 1/2N/A    
75C33U cPCI2 + 1/2S/B Cyclone® II  1 x Gb Slave 
75C53U cPCI2 + 1/2BF533 / Cyclone® III  1 x Gb Both 
78C26U cPCI6BF533 / Cyclone® II Y1 x GbHigh power D/S capableSlave 
78CS26U cPCI5BF533 / Cyclone® II Y1 x Gb Slave 
67C36U OpenVPX6BF533 / Cyclone® III Y2 x Gb Both 
68C33U OpenVPX2 + 1/2BF533 / Cyclone® IV  2 x Gb Both 
ModelBoard TypeProcessorFunction Module SlotsMaximum MemoryMaximum StorageVideo OptionsEthernetAvailable O/S
75SBC43U cPCI SBCNXP® QorIQ® P2041 Quad-Core e500mc Processor @ 1.2 GHz14 GB DDR3 SDRAM32 GB SATAII NAND FlashN/A2 x GbWind River® Linux or VxWorks®
ModelPhotoBoard TypeDimensions w/Connectors (w x h x d)Volume w/Connectors (in3)Weight / lbs (fully populated)Est. Typ. Power Dissipation (W)# of Board SlotsFunction Module SlotsMax I/O PinsEthernet
SIU66U11.75" x 3.35" x 8.65"340.49<14.012 to 60 W2123162 x Gb
ModelForm FactorMax ChannelsFunctionOn Board ReferenceOther
73LD4PC1046LVDT / RVDT MeasurementY optionConvection Cooled