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Recent content by qu1nn

  1. qu1nn

    Staking Teflon Wire

    Hello, I am looking for a material that would stake teflon coated wire to steel. I am hoping for some of the following characteristics: 1. relatively thick, quick cure 2. chemical resistant to degreasing solutions commonly used to remove flux when soldering 3. non-conductive, good insulation...
  2. qu1nn

    Ideas for tension / compression test stand

    Hello, I currently work for a company that manufactures weigh scale devices. A majority of the devices are either patient weight scales ( the kind you stand on at the doctors ) or a tension load cell (displays patient weight when on a lifter). Typically the devices can weigh up to 1000lbs full...
  3. qu1nn

    How can I measure accuracy of strain gage placement

    Hello, I need some advice on how to inspect strain gage placement inside a load cell. Typically strain gages have alignment marks, the gage itself is small at (0.25" x 0.14" ). The gage is bonded in the center of a hole (0.55" dia) drilled through inside the load cell (which is basically a...
  4. qu1nn

    Tool Steel - S7 - Surface defects?

    Hello, Is there a good web site or book which shows pictures of defects that can occur with steels. For example at work I have seen that after tool steel (S7) has been heat-treated the surface apears to have a rippling, something like I can only describe as a fingerprint or maze as when viewed...
  5. qu1nn

    S7 heat treat - Can it cause problems in wheatstone bridge app?

    Thank you for your quick responses. So ramp rates are not as important as the number of tempering cycles (except try to cool down further before repeating cycle ). Wow was I off course with that one!!!..... Several references that I have seen seem to suggest low ramp rates and controlled...
  6. qu1nn

    S7 heat treat - Can it cause problems in wheatstone bridge app?

    I am working with load cells made from S7 Tool Steel (T41907) that have already been machined and are heat treated in the following manner: 1) individual 1"x1"x3" are placed in a steel foil bag, and evacuated. 2) the pieces are placed in an oven that has been sitting at 1200-1300F...
  7. qu1nn

    RF amplifier , testing, conversions and distance for EUT

    I think that I got my self confused in the units, and I am kind of new with this so you will have to bear with me.... ----------Goal---------- To rent test equipment in order to perform immunity tests similar to IEC 61000-4-3 (3V/m, 26Mhz to 1GHz, 1kHz sine +/- 80%) to work out any bugs before...
  8. qu1nn

    Leak Rate Testing - gHe Bomb

    It is not a compensation but a proof & verification. My question revolves around pressure optimization. The test will continue regardless. I am trying to prevent overkill Thanks for responding Qu1nn Qu1nn
  9. qu1nn

    Leak Rate Testing - gHe Bomb

    Typically the design of pressure transducers is such that there is a bonded foil strain gage in a whetstone configuration which is bonded to the non-wetted side of an diaphragm… there also is an amplification/compensation electronics board assembly that is contained within a metal housing...
  10. qu1nn

    Leak Rate testing

    Typically the design of pressure transducers is such that there is a bonded foil strain gage in a whetstone bridge configuration which is bonded to the non-wetted side of an diaphragm… there also is an amplification/compensation electronics board assembly that is contained within a metal...
  11. qu1nn

    Justify electromechanical device good after sitting 5 yrs on shelf

    I do not have all of the details. The device is a pressure transducer ( I dont know if it is a hermetically sealed or not). For the storage environment I am not sure, but I can only assume std storage conditions. Again, I do not have all of the details, I am sorry. I guess if there is a...
  12. qu1nn

    good source for royer - push pull isolated dc-dc converter calcs?

    I am researching mathematical calculations for royer-push-pull isolated dc-dc converter designs < 1 Watt ... any good sources for info? any experts / design guides, etc... Thanks Qu1nn Qu1nn
  13. qu1nn

    Justify electromechanical device good after sitting 5 yrs on shelf

    What methods can be used in order to justify the use of an electromechanical device that has been sitting on a shelf for 5 yrs. -> obviously the device could be hooked up and performance verified. -> if MTBF is known, shelf time could be subtracted out any other ideas? or techniques? Thanks...
  14. qu1nn

    Noise Feedback, how to measure?

    It is part of a performance specification that a customer is asking about. Qu1nn
  15. qu1nn

    Noise Feedback, how to measure?

    The specification really means that one could run the power supply over a wide range of excitation voltages. Regulation is performed by an isolated dc-dc converter, which will oscillate, and regulate as long as it falls within min/max excitation voltages and can provide a minimum current...
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