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Discuss Bridge Megger. in the Electrical Tools and Products area at ElectriciansForums.net

telectrix

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just acquired one just like this,

but ain't got a scooby how much of it works except for the basic 500V IR test. any of the other older gen. enlighten me.
 
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telectrix

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been having a little play (as you do) and deduce that it incorporates a wheatstone bridge for resistance measurement. basically, connect unknown resistance across L and E terminals, set selector to "bridge, crank handle while operating the 4 dials. when the meter reads "inf", read off resistance from the dials, bearing in mind that there is another dial, /100,/10, x1, x10, x100. but i only got 2 hands. seems main use is to measure resistance to a fault and then calculate the distance using milliohms/m for the cable size.
 
T

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You beat me to it just about to say it's a wheatstone bridge for calculating an unknown by algebra effectively. But you would have to do it both ends presumably?
 

telectrix

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if you have a s/c on a cable and know the R values (e.g.R1+R2) upmtothe point of the short, youmshould be able to calculate the length.
 

ipf

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Another of tel's wind ups...…..

Where'd you get it, mate?
 

Lucien Nunes

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Indeed, the bridge allows it to be used as a multi-range resistance meter, and the five multiplier ratios allowed a much better precision than a typical multimeter of the day when even an AVO 8 only gave you three ranges. Also, direct-reading analogue ohmmeters suffer from poor readability at the high end of each range because the scale is compressed (they indicate 1/R with linear deflection but are scaled in R). The bridge method of measurement maintains precision all the way through the range, along with other advantages.
 

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