Do I need a new Fluke clamp meter?

Discussion in 'Electrical Engineering' started by Bob E., Nov 15, 2009.

  1. Bob E.

    Bob E. Guest

    My experience is that there are true RMS clamp meters that measure current
    via max/peak method and newer meters that use the in-rush method (ie, Fluke
    330 series).

    Accurate measurement of in-rush current has alway been possible since the
    advent of true RMS meters with Max feature. Fluke is now touting the
    triggered 100mS inrush measurement feature as the new "must-have" thing.

    How much more useful than a good true RMS clamp meter with max/hold is a
    triggered 100mS meter? For measurement of synchronous motor currents (with
    and without adjustable speed drives (ASDs)), is a trigger or a fast
    measurement really necessary? Helpful? A waste?

    What do you think?
    Bob E., Nov 15, 2009
    #1
  2. Bob E.

    James Sweet Guest

    Bob E. wrote:
    > My experience is that there are true RMS clamp meters that measure current
    > via max/peak method and newer meters that use the in-rush method (ie, Fluke
    > 330 series).
    >
    > Accurate measurement of in-rush current has alway been possible since the
    > advent of true RMS meters with Max feature. Fluke is now touting the
    > triggered 100mS inrush measurement feature as the new "must-have" thing.
    >
    > How much more useful than a good true RMS clamp meter with max/hold is a
    > triggered 100mS meter? For measurement of synchronous motor currents (with
    > and without adjustable speed drives (ASDs)), is a trigger or a fast
    > measurement really necessary? Helpful? A waste?
    >
    > What do you think?
    >



    Is there something you need to do that the meter you already have is not
    adequate for? If what you have works, then there's no reason to upgrade.
    James Sweet, Nov 15, 2009
    #2
  3. Bob E.

    Phil Allison Guest

    "Bob E."
    >
    > My experience is that there are true RMS clamp meters that measure current
    > via max/peak method and newer meters that use the in-rush method (ie,
    > Fluke
    > 330 series).


    **That is not " experience " -

    that is pure witch doctor mentality.


    > Accurate measurement of in-rush current has alway been possible since the
    > advent of true RMS meters with Max feature.


    ** Is that " Mad Max" or " Max Headroom

    - you are alluding to here ??



    > Fluke is now touting the
    > triggered 100mS inrush measurement feature as the new "must-have" thing.


    ** Discussed here in detail, four days ago.

    You going blind ??


    > How much more useful than a good true RMS clamp meter with max/hold is a
    > triggered 100mS meter? For measurement of synchronous motor currents (with
    > and without adjustable speed drives (ASDs)), is a trigger or a fast
    > measurement really necessary? Helpful? A waste?
    >
    > What do you think?



    ** There are more things in heaven and on earth ...

    And a TROLL by any other name smells just as putrid as this shit.

    Hope Willy forgives me ....



    ..... Phil
    Phil Allison, Nov 15, 2009
    #3
  4. Bob E.

    krw Guest

    On Sun, 15 Nov 2009 07:09:10 -0800, Salmon Egg
    <> wrote:

    >In article
    ><-september.org>,
    > Bob E. <> wrote:
    >
    >> My experience is that there are true RMS clamp meters that measure current
    >> via max/peak method and newer meters that use the in-rush method (ie, Fluke
    >> 330 series).
    >>
    >> Accurate measurement of in-rush current has alway been possible since the
    >> advent of true RMS meters with Max feature. Fluke is now touting the
    >> triggered 100mS inrush measurement feature as the new "must-have" thing.
    >>
    >> How much more useful than a good true RMS clamp meter with max/hold is a
    >> triggered 100mS meter? For measurement of synchronous motor currents (with
    >> and without adjustable speed drives (ASDs)), is a trigger or a fast
    >> measurement really necessary? Helpful? A waste?
    >>
    >> What do you think?

    >
    >"Need" is a subjective term.
    >
    >If what you want is to make a repetitive job easier, I would recommend
    >(without personal experience) a good hand held oscilloscope such as
    >Fluke makes. They are not cheap. With that, you need a current
    >transformer with a load resistor called a Rogowski coil equivalent. That
    >is the clamp-onm and sensing part of a clamp-on meter. Record the
    >start-up current waveform. Then you have a record of the waveform you
    >can data process to your heart's content instead of relying upon someone
    >else's cryptic algorithm.
    >

    That's the "Doctor Strangelove" mentality. ;-)
    krw, Nov 15, 2009
    #4
  5. Bob E.

    Fred Abse Guest

    On Sun, 15 Nov 2009 02:29:30 -0800, Bob E. wrote:

    > My experience is that there are true RMS clamp meters that measure current
    > via max/peak method and newer meters that use the in-rush method (ie,
    > Fluke 330 series).
    >
    > Accurate measurement of in-rush current has alway been possible since the
    > advent of true RMS meters with Max feature. Fluke is now touting the
    > triggered 100mS inrush measurement feature as the new "must-have" thing.
    >
    > How much more useful than a good true RMS clamp meter with max/hold is a
    > triggered 100mS meter? For measurement of synchronous motor currents (with
    > and without adjustable speed drives (ASDs)), is a trigger or a fast
    > measurement really necessary? Helpful? A waste?
    >
    > What do you think?


    Read Fluke application note 1629920 and work it out.


    --
    "Electricity is of two kinds, positive and negative. The difference
    is, I presume, that one comes a little more expensive, but is more
    durable; the other is a cheaper thing, but the moths get into it."
    (Stephen Leacock)
    Fred Abse, Nov 15, 2009
    #5

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