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LCR Meter Suggestions

Discussion in 'Electronic Design' started by Darol Klawetter, Jan 24, 2013.

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  1. Can anyone suggest a good LCR meter? An industrial-quality instrument is preferred.
     
  2. qrk

    qrk Guest

    http://www.thinksrs.com/products/SR715720.htm
    I think the 720 is close to $2k. I've found that a HP4194 works quiet
    well if you wind your own magnetics. Meters like the SR720 are too
    limiting if you do your own magnetics and need to qualify capacitors.
     
  3. We've got an SRS 720 that we use mostly for cap matching.. but also to
    check coils sometimes. Frequencies are 100, 120, 1k, 10k and 100kHz.
    $2k in my old catalog.

    George H.
     
  4. What is your budget? What is your definition of "good"?

    SRS has some nice retro-1980s styling ones for a few thousand.
    SR715/720. They work okay for most purposes.

    Or if you feel lucky you can get a real Chinese LCR bridge for a few
    hundred. Or an LCR meter type thing for a hundred or so.
     
  5. Their Kelvin clips suck big-time unless you're exclusively dealing
    with 1975 leaded parts with fat leads. The tweezers are better, but
    still pretty MM for $300.

    The bridge itself works fine (but don't get the model wrong or you'll
    get stupid readings.. don't ask...).
     
  6. Grin... yup, living on the trailing edge of industry.

    But you are correct the input is clunky. I've used a few 'mods' on
    the input,
    including the dreaded white proto board.

    George H.

    The tweezers are better, but
     
  7. Fred Abse

    Fred Abse Guest

    HP4274A. I love mine.

    Find one with Option 001 (0-35V DC bias), and the bias controller box.
    You'll need that if you want to do anything meaningful with Y5V dielectric stuff.

    Manuals are still on agilent.com. Take a look.
     
  8. Thanks to you all for the help. I'll consider your suggestions as I continue to define requirements for the meter. One requirement is that it be capable of measuring capacitance in the range from 1 pf to 10 uf, at 10% accuracy. Actually, I'll aim for the greatest accuracy I can get for a cost of around $500.

    Darol Klawetter
     
  9. Guest

    Before you spend your hard earned money, you should look at http://aade.com/.
    Neil was my lead way back in about ' 65. He is a really sharp
    engineer. He has a page on some accuracy tests he did on measuring
    inductors and capacitors with his meter and some other instruments.
    It llooks as if you can exceed your accuracy requirements for
    measuring L and C and only spend about $100. It will not get you to
    10 ufd. But the web site is worth looking at even if you do not buy
    anything.


    Dan
     
  10. Jamie

    Jamie Guest

    And don't ever buy this B model
    http://www.amazon.com/BK-Precision-875B-Low-Ohm-Meter/dp/B000LDJ7L4

    I had an "A" model which worked perfectly, incircuit and out, I would of
    recommended it to any one. It got used and never returned back to me. I
    had my employer get me another one. The "B" version replaces the "A" and
    I can tell you it is a total re-engineered device that's not even close
    to the quality of the "A" model.

    It's intermitting at times when doing cap measurements and it has a
    hard time doing in circuit testing. Not only that, you can not use each
    scale to it's fullest, you have to select a scale that puts the expected
    value at 50% or more, stated in the manual, otherwise no matter what
    value you use it always seems to reach up around the 30% scale of min
    reading, unless of course it is large enough to get into the working
    area of the scale. I call that bad design work!

    I had purchasing send that unit back for another, thinking it was
    defective. Nothing could be that bad, but the new one came in and it too
    was the same...

    The basic Cap mode in my portable fluke (289) does much better than
    this unit does for remote cap measurements.

    I don't use it for serious work, it's a good thing I do have a more
    serious unit to use for that.

    Just another company and their products showing signs of the time (Greed).

    Jamie
     
  11. Ben Bradley

    Ben Bradley Guest


    I see some have denigrated some B&K models, but I have a BK878 LCR
    I got 12 years ago, and I like it just fine. Claimed accuracy is
    around 1 percent and capacitance resolution is 0.1pF, and it goes to
    thousands of uF. Reads at 120Hz or 1kHz, displays dissipation factor
    or Q, but not ESR (perhaps the main reason you might want something
    else if you want to know ESR of electrolytics). There was an 878A with
    RS232, and the current model is BK878B with USB, and still in the $250
    range.
     
  12. Update: I decided to purchase the Agilent U1733C LCR meter. Moderately priced ($428) and HP/Agilent test equipment generally has excellent long term reliability. Again, thanks for all of the input.
     
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