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Cool Channel Setup tricks for Triaxial Accelerometers

Siemens Legend Siemens Legend
Siemens Legend

(view in My Videos)


Looking to setup triaxial accelerometers quickly and correctly in LMS Test.Lab?  triax.jpgTriaxial Accelerometer


If so, here are three tips for you!:



1.  Use Auto Fill


In the LMS Test.Lab "Channel setup" worksheet, highlight the PointId and Direction of a triaxial accelerometer.  Hover the mouse in the lower right hand corner of your selection.


4-9-2016 9-58-42 AM.pngHover mouse in lower right corner of triaxial selection until double white arrow appears


 Once a Double White arrow appears, drag the mouse down or up to fill in the other channels.  The "PointId" field will be automatically incremented, and the "Direction" fields will be filled with the same information as the original triax information.



4-9-2016 9-58-11 AM.pngDrag the arrow up/down with the mouse to auto fill triaxial information on the other channels


2. One Wire Triaxial Accelerometers


If you use a Scadas V-24 card or ScadasXS, you can connect a 3 channel triaxial accelerometer with one cable.


ScadasXS_with_Triax.pngSingle Wire triaxial accelerometer and ScadasXS

For example, if you have a PCB Triaxial Accelerometer (either 4 pin or mini 4 pin), you can order PCB cables:


  • PCB Cable 010M136/M003 (LMS  lemo to 4 pin connector) where the "003" means 3 meters (5 and 10 can be substituted for the "3")  




  • PCB Cable 034M59/M003 (LMS  lemo to 4-pin miniature connector) 

XS_Triax2.jpgScadasXS and Scadas V-24 lemo connection support single wire connections for triaxial accelerometers

Compared to a traditional 3 BNC connection, this makes it impossible to cross wire the triaxial directions!



3.  Enforce Right Hand Rule Automatically


By default, directions on channels can be set independently.  Directions are not checked for compliance to the right hand rule.  This can lead to mistakes when doing a Modal Analysis or Operational Deflection Shape.


4-9-2016 9-58-29 AM.pngDefault Channel Setup behavior allows directions to be set independently on each channel


In Tools -> Channel Setup Visibility, add the channel setup field called "MultiChannel".  For any triaxial accelerometer channels, set the "MultiChannel" value to "Triax-RH".



4-9-2016 9-57-54 AM.pngSetting "MultiChannel" to "Triax-RH" limits direction selections to valid right hand rule combinations


Setting a group of three channels to "Triax-RH" limits the selection of directions to valid Right Hand Rule combinations.  No more "flyer points" on Modals and Operational Deflection Shapes!


Hope these tips help!


PS> If you are from Australia, there is a "Triax-LH"....


If you have questions, feel free to contact us!


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