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Recent content by jcm61

  1. jcm61

    How to calculate frequency at given time using sweep rate?

    I was curious what frequency IRstuff and electricpete calcuated for the second incident, at t= 6.783 minutes, into the 4th, 30 minute sweep which begins at 500Hz and A= 5 g's and descends to 5 Hz and A=.23g as shown in the attached 810F figure 514C-5C test sweep profile (each sweep is a mirror...
  2. jcm61

    How to calculate frequency at given time using sweep rate?

    That's what I was looking for... Thanks to IRstuff and electricpete for your collective input.[thumbsup2] JCM
  3. jcm61

    How to calculate frequency at given time using sweep rate?

    THANKS FOR YOUR RESPONSE btrueblood! PLEASE ANSWER MY QUESTIONS BELOW [BRACKETED]: freq = (5 Hz) * 2^(t/.2215) for 0<t<t1 [I ASSUME THAT THIS IS "eqtn 1" you are referring to below? CAN YOU TYPE OUT THIS EQUATION OR DIRECT ME TO A WEB SOURCE WHERE I CAN SEE THE DERIVATION OF THIS EQUATION...
  4. jcm61

    How to calculate frequency at given time using sweep rate?

    THANKS FOR YOUR RESPONSE [ANSWER TO YOUR QUESTION AND MY COMMENTS ARE BRACKETED] Your information seems to still be incomplete. Is each sweep immediately after the previous? [YES] i.e., does 00:37:53 represent 7:53 into the second sweep? [YES] If so, then the frequency should be 5 Hz *...
  5. jcm61

    How to calculate frequency at given time using sweep rate?

    We recently subjected one of our devices to a sinusoidal vibration test (per MIL STD 810F, method 514C-18) at a local test house that used a sweep-rate of 0.2215 octaves per minute. The 810F test is performed in 3 axes, consisting of six (6), 30 minute sweeps per axis, ranging from 5 Hz to 500...
  6. jcm61

    GE Lexan 943A Resin &amp; HP92W Film _ Anti-static solution(s)!

    I need a to locate a spray or coating that can be used on both GE Lexan 943A-116 [use: Inj-molded plastic cover that features an LCD viewing window for an industrial control] & GE HP92W 7mm thick film [use: top {external} material layer of domed membrane keypad]. The product is intended for use...

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