Re: 'Megger' Circuit Testing Ohmmeter (early 1960s)
Chris, interestingly the AVO High Sensitivity model (mine's 1948) with the low ohm press button range, measures the voltage across the unknown resistance.
Phil, your Duplex megger must be around 1951-52 using Richard's rough guide. Hasn't been left in the sun unlike mine. Once i found that it worked - and was a 500v job- i didn't/don't plan to get another one (but can i stick to this..?)
The terminals are quite rough looking bits of brass thread, over which bakelite knobs with female brass inserts fit. When they are removed they have a nasty habit of rolling away and falling onto the floor, which might explain why one is damaged.
|