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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.
 
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.
 
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?
 
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.
 
Another of tel's wind ups...…..

Where'd you get it, mate?
 
Another of tel's wind ups...…..

Where'd you get it, mate?
from a cousin of mrs. tel. he comes across things like this now and then. flea markets etc.
 
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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