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Old 23rd May 2021, 7:03 pm   #1
Join Date: Aug 2007
Location: Walsall Wood, Aldridge, Walsall, UK.
Posts: 2,256
Default Levell TM14 Insulation Tester


I have finally after several years hunting, won one of these Levell TM14 instruments, so the first job on the agenda will be to redraw Levell's "kiddie scribbles" into something a little easier and clearer to read!

I do have a layout diagram of the PCB for one of these, but as I'd sneaked it out of a former employer, I felt unable to post it whilst they were still in business!

Now they are no more (Telford sold me a couple of T & M books with their library filing labels on them!) there is no longer any reason why this shouldn't be posted now, so I'll get it scanned as soon as I find it!

This diagram has the diode and transistor types on it which I know Members have been after!

I am certainly curious as to why Levell used "J" as the circuit reference for transistors tho'.

Chris Williams
It's an enigma, that's what it is! This thing's not fixed because it doesn't want to be fixed!
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Old 23rd May 2021, 8:24 pm   #2
Join Date: Oct 2007
Location: Exeter, Devon, UK.
Posts: 1,471
Default Re: Levell TM14 Insulation Tester

Levell TM14.
Would the attached copy of the manual and circuit save you some effort.
I believe I might have a copy of the parts and transistor types, but cannot find it at present. So I would quite like your updated list.
Attached Files
File Type: pdf Levell TM14-wm.pdf (906.0 KB, 81 views)
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