ampere of pico fuse

Discussion in 'General Electronics Chat' started by minh, Jun 28, 2014.

  1. minh

    Thread Starter Member

    Nov 24, 2010
    24
    1
    Dear all..
    By accident (short circuit) the pico fuse(dimension like as resistor 1 watt) of my wattmeter is blown . Could you help me to know value of ampere (ie: 250v 1/4 amp...) this pico fuse. the color code in photo please. In the time waiting your help can I used glass fuse for replace .Thank you so much
     
    Last edited: Jun 29, 2014
  2. wayneh

    Expert

    Sep 9, 2010
    12,086
    3,024
    How do you know it's a pico fuse? Looks more like an inductor.
     
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  3. Lestraveled

    Well-Known Member

    May 19, 2014
    1,957
    1,215
    Could it simply be a 61 ohm resistor?? How old is this unit?
     
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  4. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,343
    Hello,

    It could be an 68 Ohms resistor.
    The colors may have changed due to the heat.

    Bertus
     
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  5. minh

    Thread Starter Member

    Nov 24, 2010
    24
    1
    First Thank you to all for the time help me
    Yes I am not sure it is pico fuse. But when cut ( cross-sectional) I seen outside paint + code color next metal???
    and inside is white ceramic ̣??? ̣don't seen nothing magnet wire.
    I tried replace with 100 ohm 1 watt but quickly too hot.
    Next I replace with fuse glass 1/4 ampere is working (but not sure is alright.
     
    Last edited: Jun 29, 2014
  6. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,343
    Hello,

    Do you have a schematic where this device is used?
    The value can be 6.8 or even 0.68 Ohms.
    We do not know the original color of the black ring.

    Bertus
     
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  7. Markd77

    Senior Member

    Sep 7, 2009
    2,803
    594
    How hot is too hot?
    Often 1W resistors will get very warm but still be working as intended. The reason is that the designer thought a 1/4 W would be destroyed. Even with 1/2 W dissipated by a 1W resistor it will be too hot to touch.
     
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