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power consumption

Discussion in 'Electronic Design' started by pmm, Dec 14, 2004.

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  1. pmm

    pmm Guest

    Hello everyone,
    I am fresher engineer workingon the electronics design .
    I have designed a circuit board with a Micro controller, SRAM, a
    MotorDriver on it, and along with somehundreds of discretes ,now i am
    unable to measure the total power consumption ,any one plz give me the
    idea to mesure it as i need to place a on board power supply .Till now
    i have used a Regulated power supply of the lab,and it is not having
    a provision of displaying current consumption.
    Plz help me with the process to measure the power consumption
    thanks and regards
    pmm
     
  2. Connect your multimeter set to the ampere range in series with each
    supply, one at a time with everything running. You may need some
    modified software to run everything at the same time.
     
  3. Mac

    Mac Guest

    Well, you seem to understand that all you need to do is measure the
    current.

    An instrument for measuring electrical current is called an ammeter. Most
    hand-held and bench meters measure Volts, Amps, and a variety of other
    things. To operate in ammeter mode, you usually have to rearrange the
    leads on the meter, and select "DC amps" or something similar.

    So, you power up the board from your bench supply, with the ammeter in
    series with the board. First, adjust the bench supply so that the voltage
    ON THE BOARD is correct. The Voltage at the power supply may be a bit
    higher than usual, now, because the ammeter has to have a Voltage drop to
    work. (This means you will need two meters. I hope you have two!)

    So once you have the voltage at the right level on the board, record the
    amps going into it, and you have everything you need. (P = VI, but I think
    you know that ;-)

    HTH.

    --Mac
     
  4. Ban

    Ban Guest

    I'm puzzeled, how can you design complicated PCBs and be an engineer without
    knowing how to measure supply current?
     
  5. Fred Bloggs

    Fred Bloggs Guest

    The power supply capacity should be computed worst case and not
    measured. Take your question to the basic newsgroup.
     
  6. And don't forget to re-rearrange the meter leads immediately after the
    current reading is completed!!
     
  7. CFoley1064

    CFoley1064 Guest

    ubject: Re: power consumption
    Because he's a "fresher" engineer. I believe it's a colloquialism meaning
    straight out of school, and I'm assuming it's not in the Heinlein sense
    (although the question does get you wondering).

    I would suppose he's good with pspice, though.

    Chris
     
  8. Jim Thompson

    Jim Thompson Guest

    On 14 Dec 2004 14:52:20 GMT, (CFoley1064) wrote:

    [snip]
    That was an underhanded slur. Particularly since it is my observation
    that it takes hands-on experience before you can really understand how
    to use simulators.

    ...Jim Thompson
     
  9. I read in sci.electronics.design that Jim Thompson
    To use pspice you need PerSPICacity.

    Furthermore, DVD is going to be replaced by EWE, because it's inherently
    sheeper.
     
  10. Bob Stephens

    Bob Stephens Guest

    Until you run out of RAM.
     
  11. I read in sci.electronics.design that Bob Stephens <stephensyomamadigita
    If you have RAM in your EWE, the natural consequences will follow. Baa!
     
  12. CFoley1064

    CFoley1064 Guest

    Subject: Re: power consumption
    Sorry, no offense meant.

    I should have left the <irony> switch visible. I thought the prior backhanded
    reference to Heinlein's "freshers" gave an indirect indication of that.

    http://technovelgy.com/ct/content.asp?Bnum=382

    You're exactly right, of course.

    Chris
     
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