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Thread: Multimeter with inductance?

  1. #36
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    Quote Originally Posted by g1 View Post
    Thanks nosaj.
    Split banana's are definitely new to me. Still think it's very odd there is no mention of it or of an accessory available in the instruction manual.
    This trick came from General Radio, from which the DE-5000 design came.

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    So can anyone link a 4 wire probe set that will work with these split banana or the double sided blade terminals?

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  3. #38
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    Looks like your stuck using the tl-21 adapter and modifying a set of kelvin cables.
    Could not find what your asking for.
    http://dexterslab2013.blogspot.com/2...onversion.html
    nosaj

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    Quote Originally Posted by nosaj View Post
    Looks like your stuck using the tl-21 adapter and modifying a set of kelvin cables.
    Could not find what your asking for.
    http://dexterslab2013.blogspot.com/2...onversion.html
    nosaj
    Yes, I think this is the only way. I could not find any such thing as a 'split' single banana plug. All searches turn up 'dual banana' plugs, which is a different thing.
    I have no idea how they came up with the receptacles (split single banana) on the meter itself and what plug is supposed to mate with it. And if there were such a plug, what would prevent it from rotating so it shorts the 2 sides together?

    So, technically, this meter supports 4 wire measurement, but there are no commercially available accessories to do so unless you build your own.

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    I looks as if the meter is layed out for 4-wire operation, i.e. separate current source and voltage measuring circuits. As it also allows 2-wire measurement, the banana receptacles need to provide a shorting function when inserting a normal banana plug to connect source and meter circuits.
    In other words, the split contact banana receptacles are necessary to allow 4-wire measurement with no bananas inserted.
    Once banana plugs are inserted into the +/- receptacles and the 2 halves are shorted, the 4-wire system is converted to a 2-wire configuration.

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    Last edited by Helmholtz; 12-29-2018 at 06:37 PM.
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  6. #41
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    Quote Originally Posted by Helmholtz View Post
    I looks as if the meter is laid out for 4-wire operation, i.e. separate current source and voltage measuring circuits. As it also allows 2-wire measurement, the banana receptacles need to provide a shorting function when inserting a normal banana plug to connect source and meter circuits.
    In other words, the split contact banana receptacles are necessary to allow 4-wire measurement with no bananas inserted.
    Once banana plugs are inserted into the +/- receptacles and the 2 halves are shorted, the 4-wire system is converted to a 2-wire configuration.
    That's exactly right.

    IET no longer sells the DE-5000 (or its successor DE-6000?), but here here is the IET manual (from 2011) on the DE-5000: https://www.ietlabs.com/pdf/Manuals/DE_5000_im.pdf

    It appears (page 37 top) that the split-pin banana jacks are used only to compensate paths within the instrument, so no split-pin dual banana plugs are used or provided.

    IET also provides a 78-page primer on LCR measurements: https://www.ietlabs.com/pdf/applicat...%20Edition.pdf

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  7. #42
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    The split receptacle contacts act as switches. Without them (or a separate switch) 4-wire operation via the blade contacts would not be possible.

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