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Recent content by mkoijn

  1. mkoijn

    Magnetic dial guage stand

    Does anyone know how those magnetic dial guage stands work, the sort where you push a button or turn a knob to activate the magnetic force? Thanks finnigan
  2. mkoijn

    Modal identification using Frecuency domain descomposition

    This is quite an interesting parameter estimation algorithm. http://www.energy.sintef.no/produkt/VECTFIT/index.asp It certainly fitted a few test cases I gave it at any rate. And it's free and written in Matlab. I converted it to Scilab tho' as thats free as well, unlike matlab :-) ....
  3. mkoijn

    connecting panasonic mic to icp p/s

    Sorry it was a typo in my first post, I meant "Phantom power" Here is an introduction to ICP power supplies. If you would have a look, I would be very grateful. http://www.pcb.com/techsupport/tech_signal.php Thanks again Al
  4. mkoijn

    connecting panasonic mic to icp p/s

    Thanks, Perhaps I explained very badly, The ICP power supply, besides supplying the power to sensors also recieves the signal from the sensor and amplifies it to line level. would your suggestion of building a linear regulator still work in this case? Al
  5. mkoijn

    connecting panasonic mic to icp p/s

    Hello, I have some panasonic microphone capsules (output impedance 2k) that should run on a 10 volt 0.5 mA pantom power supply, how could I use the ICP power supply that I already have, to power the microphone capsules? The ICP power supply is 24 volt, 4 mA constant current. It is designed for...
  6. mkoijn

    Time history data manipulation

    google "octave" and "scilab" . Both are freeware math software with fft functions. Ocvtave is a great Matlab clone. possible problem with the excel fft is that it's limited to 4096 points. Best regards finnigan
  7. mkoijn

    modal parameter code, run out of memory

    Hi, No, I never did use the Diamond toolbox as I don't have Matlab! I use GNU octave which is a freeware matlab clone. Unfortunately Octave doesn't support 3d matrices which are required in the Diamond toolbox. What I basically did was rewrite the GRFP Mfiles to work in Octave, I found however...
  8. mkoijn

    modal parameter code, run out of memory

    The denominator orthogonal poly coeffs are not the same for each frf from the structure. You have to calculate for the normal denominator coeffs which are the same for each frf. p p SUM[Uk]^2{B} = SUM[Uk]{Vk} k=1 k=1 where [Uk] = [I-[Xk]'[Xk]][BMk]^-1 {Vk} =...
  9. mkoijn

    vibration software

    From all of the shareware spectrun analysers I've tried (and I think I've probably tried them all.....) Atspec is by far the best. It's available from www.taquis.com/atspec.htm
  10. mkoijn

    modal parameter code, run out of memory

    Thanks for the help MikeyP. I followed your suggestion debugging the code using "whos". The problem with the memory is the following lines in function rpcoeffs see below SOLROW is a complex matrix of size 11520 rows * 430 cols and WCUM is size 11520 rows * 1 cols this eats about 180Mb...
  11. mkoijn

    modal parameter code, run out of memory

    The following code is part of a program I've cobbled together to extract modal parameters from multiple frf's, it extracts the polynomial coeffiients. It's adapted from the diamond modal toolbox and I'm running it in GNU Octave which is an open source matlab clone. The problem I'm having is...
  12. mkoijn

    scilab equivalent of matlab 'invfreqs' function

    Does any know the Scilab equivalent of Matlabs invfreqs function? Thanks finnigan
  13. mkoijn

    Running Macros at a pre-set time

    Chamberlin, the ontime code is a seperate macro which could be in the same module as the one which you want to run at 6:00AM, as shown below. Sub ontime() Application.OnTime TimeValue("6:00:00"), "Test" End sub Sub Test() Range("A1").Value = 10 End Sub I...
  14. mkoijn

    natural frequency thread disappeared?

    Hey ElectricPete, it's not the first thread thats gone missing. I've posted to three other threads in the past months which then mysteriously disapeared, I was beginning to think I was a jynx. although other threads I've posted to haven't disappeared. One of the threads did reappear tho' about a...
  15. mkoijn

    Running Macros at a pre-set time

    You need to use the OnTime method For example the following code executes the macro test in the ThisWorkbook code module of the book1 workbook at 6:00am Application.OnTime TimeValue("6:00 AM"),_ "D:excel\book1.xls!ThisWorkbook.test" best regards
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