LVDT / RVDT Measurement (L/D) (R/D)


Modules LD1 – LD5

Modules LD1LD5 are NAI’s latest generation LVDT/RVDT Measurement Modules. These multichannel programmable modules are used on our multifunction embedded boards and SBCs.

A linear variable differential transformer (LVDT) is a type of electrical transformer/transducer used for measuring linear displacement (position). A counterpart to this device 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. This causes a magnetic flux generated on transformer secondary (ies) by a moveable core proportional to the linear displacement position being gauged.

The modules cover a wide range of excitation voltages/frequency so they can interface to almost any transducer. With isolated excitation and signal input covering 2-, 3-, or 4-wire transducer interfaces and a normalized digital position word based on a percentage of full scale travel, these modules are able to interface to virtually any type LVDT or RVDT transformer.

All LVDT/RVDT modules feature a background self-test capability and most platforms support an optional, programmable AC excitation supply. In addition to state-of-the-art technologies and specialized design algorithms, the modules include many other useful application features such as excitation loss detection, and excitation voltage and frequency measurement. Full-scale operating signal and excitation voltages/frequency between 2-28 Vrms can be specified. Individual excitation inputs are supplied for each channel.


Click below for detailed function module specifications:

LD1L(R)VDT/D (Module LD*) - Four LVDT/RVDT Measurement Channels

Function module(s) featured in products below:

ModelBoard TypeBoard ArchitectureFunction Module SlotsSizeEthernetMaster / SlaveOn Board ReferenceOther
75G53U cPCIARM / Xilinx® Zynq3 2 x GBBoth   
64G56U VMEARM / Xilinx® Zynq6 2 x GBBoth YUser application ARM processor capability
68G53U OpenVPXDual Core ARM® Cortex® A9 @ 800 MHz3 2 x GBBoth  Slot profile: SLT3-PER-1F-14.3.2 / Module profile: MOD3-PER-1F-16.3.2-2
79G5PCIe 31/2   N/A 
ModelBoard TypeProcessorFunction Module SlotsMaximum MemoryMaximum StorageVideo OptionsEthernetAvailable O/S
75ARM13U cPCI SBCXilinx® Zynq 7015 with Dual Core ARM® Cortex® A9 @ 800 MHz3512 MB DDR3L SDRAM32 GB SATAII NAND FlashN/A2 x GBWind River® Linux, VxWorks® and Xilinx® PetaLinux OS support
68ARM13U OpenVPX SBCXlilinx® Zynq 7015 & 7016 w/Dual Core ARM® Cortex®-A9 @800MHz3512 MB DDR3 SDRAM32 GB SATAII NAND FlashN/A2 x GBWind River®, VxWorks® and Xilinx® PetaLinux OS Support
75PPC13U cPCI SBCNXP® QorIQ® P2041 Quad-Core e500mc Processor @ 1.2 GHz28 GB DDR3L SDRAM32 GB SATAII NAND FlashN/A2 x GBWind River® Linux or VxWorks®
75INT23U cPCI SBCDual Core Intel® i7 3517UE @ 1.5 GHz28 GB DDR3L SDRAM32 GB SATAII NAND FlashVGA, HDMI, LVDS, or DVI2 x GBCentOS, Red Hat®, Linux®, and Windows® Embedded Standard 7
64ARM16U VME SBCXilinx® Zynq Dual Core ARM® Cortex® A9 @ 800 MHz6 + AC Ref512 MB DDR3L SDRAM32 GB SATAII NAND FlashN/A2 x GBWind River® Linux, VxWorks® and Xilinx® PetaLinux OS support
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
NIU1AModule6.8" x 1.5" x 2.5"28.90<1.25 to 15 WN/A1592 x GB
SIU313U cPCI4.71" x 2.35" x 8.71"96.41<5.07 to 35 W131322 x GB
SIU333U cPCI4.71" x 4.78" x 8.71"196.10<10.014 to 75 W393222 x GB
SIU353U cPCI7.13" x 4.78" x 8.71"296.85<15.025 to 100 W5155122 x GB