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PbF failure of 20mm fuse ?

Discussion in 'Electronic Repair' started by N_Cook, Aug 13, 2013.

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  1. N_Cook

    N_Cook Guest

    How to determine whether tinpest layer round an end of the filament or a
    physical break?, just durious as to failure mode. 200mm F type. Breaking
    the glass is likely to disrupt the failure situation. Filament seems to
    be in proper place , diagonal along the visible part of the tube and no
    observable movement on normal handling. No circuit failure to have
    caused long term aging stress failure of the filament at one end. I've
    not tried 500V/1000V insulation test (could perhaps marginally "weld"
    the failure) but DVM-R >30M
  2. N_Cook

    N_Cook Guest

    This fuse in one LED line of the 3 RGB lines of a DMX lamp.
    Tried the fuse on 500V insulation tester with 10M in line and >500M ohm
  3. N_Cook

    N_Cook Guest

    Set fuse in an open frame fuse holder. Ground into the glass until it
    cracked. Could insert a needle in there and o/c in both directions.
    One end broken , whether by me , unknown, other end fixed in. Crush the
    glass in preset mole-grips and then I decided to prize out the caps from
    the holder with a blade and the one with the still captive filament went
    flying across the room
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