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 Post subject: Simpson 260 fuse mystery!
PostPosted: Nov Fri 08, 2019 2:29 am 
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Joined: Jun Wed 08, 2011 2:33 am
Posts: 9541
Location: Ohio 45177
Simpson 260-6 operator manual schematic shows fuses in line with negative lead. One version of the schematic shows a 1 amp fuse there, the manual version shows a 2 amp and a 1 amp fuse, in series with the negative lead. F1 and F2. Someone 'splain to me why you put two different fuses in series like that? Thanks.

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 Post subject: Re: Simpson 260 fuse mystery!
PostPosted: Nov Fri 08, 2019 3:22 am 
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Joined: Jun Sat 15, 2019 7:43 pm
Posts: 273
One is a higher voltage fuse, if the low voltage doesn't clear the high voltage one will. Voltage ratings are important on fuses.

DM


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 Post subject: Re: Simpson 260 fuse mystery!
PostPosted: Nov Fri 08, 2019 3:25 am 
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Location: Ohio 45177
OK? Thanks.

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Reddy Kilowatt says; You smell smoke? Sorry about that!


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 Post subject: Re: Simpson 260 fuse mystery!
PostPosted: Nov Wed 13, 2019 2:13 am 
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Joined: May Fri 01, 2009 3:53 am
Posts: 1528
Location: Glendale, California
The 1A fuse is a regular 250V 3AG glass type. The 2A fuse is a 10kA interrupt rated 600V fuse with a fusible sand fill for arc quenching, in case of a VERY severe overload. The additional fuse was added midway through Series 6 production, as part of "Revision K". 260 Series 6, Revision K meters can be identified without opening the case by looking at the very bottom left of the dial scale, somewhat under the front cover, for the letter K.

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 Post subject: Re: Simpson 260 fuse mystery!
PostPosted: Nov Wed 13, 2019 3:50 am 
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Joined: Mar Wed 16, 2011 10:44 pm
Posts: 1061
Location: Peekskill, NY
Story goes that folks used to test line voltage with the meter on ohms, or mA scale. The fuse
would blow and develop an arc inside, and continue conducting, with destructive results. Hence
the second, high current intterupt rated fuse one sees in most modern meters these days.

I've gotten away from testing line voltage with a simpson meter, and use a wigger these days.


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