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  1. fetterlabs

    Calculating pressure altitude from geometric height

    How does the FAA Tech Center calculate pressure altitude given the geometric height as measured from an AGHME station?
  2. fetterlabs

    Acceleration data

    If the data is all ready in the frequency domain, just divide each frequency line by jw. I suspect, if you were able to get the data into the frequency domain, you were using a program, and this program should have the ability to integrate in the frequency domain. Many even do the double...
  3. fetterlabs

    Microcontroller for writing to Compact Flash cards

    It looks like my problem was the 512 byte buffer in the CF. I was only writing 511 bytes. Thanks for your help though.
  4. fetterlabs

    Microcontroller for writing to Compact Flash cards

    Thanks Chris, Do the SD and MMC cards have the same initialization procedure as the CF? That seems to be where I'm having trouble.
  5. fetterlabs

    Microcontroller for writing to Compact Flash cards

    durdon, Did you ever get your PIC and CF to work. I'm doing the same thing, and having difficulty. Mikroelektronika supply's CF routines with their board, which work great, but I'm using a different compiler. Mikroelektronika does not supply source code for their routines and I can't seem to...
  6. fetterlabs

    g level of unbalanced rotating member

    The 7290 series is very good. Here are some others. http://www.msiusa.com/download/pdf/english/icsensors/accelerometers/stand_alone/model_3140.pdf http://www.pcb.com/product.asp?measureType=852&productType=&template_id=56&showProduct=1
  7. fetterlabs

    g level of unbalanced rotating member

    EnglishMuffin:sorry, but I have never heard of such a thing as a "steady state accelerometer" which "reads the acceleration due to gravity" I think you need to get out more.[smile]
  8. fetterlabs

    g level of unbalanced rotating member

    Thank-you alexit for boiling it down to a case of uniform circular motion for me. As for electricpete and EnglishMuffin: There are two basically two types of accelerometers. Steady-state accelerometers will measure from DC to several hundred hertz. Dynamic accelerometers measure from a few...
  9. fetterlabs

    g level of unbalanced rotating member

    EnglishMuffin, 1. Some call it radial acceleration, I prefer normal. I mean perpendicular to the surface. If you ignore the steady-state acceleration due to gravity and only measure the acceleration due to rotation, in a perfectly balanced shaft it should be zero. In reality, things are...
  10. fetterlabs

    g level of unbalanced rotating member

    I have what I thought was a simple question, but am having difficulty obtaining an answer. Hopefully you all can help. If an accelerometer were mounted so it could measure the normal acceleration of a perfectly balanced rotating shaft it would read zero. Now take that same shaft and make it...

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