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Test Equipment Anonymous (TEA) group therapy thread

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Specmaster:
Thanks  :-+

Specmaster:

--- Quote from: bd139 on May 20, 2018, 10:37:55 am ---
--- Quote from: Specmaster on May 20, 2018, 09:47:46 am ---Thought you'd got yours to agree with your Agilent, that's good enough surely?

--- End quote ---

I did but that's only on 4 digit resolution. Perhaps I'm slowly turning into a voltnut :)

--- End quote ---
I really can't but help thinking is it really worth it, the 5th least significant digit is always changing anyway?

Specmaster:
I've seen many various thoughts about whether the earth on the secondary side of the 240v isolating transformer should connected to the incoming earth or left to float. Is there a real answer to this or not? 

KrudyZ:

--- Quote from: Specmaster on May 20, 2018, 10:08:59 pm ---I've seen many various thoughts about whether the earth on the secondary side of the 240v isolating transformer should connected to the incoming earth or left to float. Is there a real answer to this or not?

--- End quote ---

This should probably be in its own thread, but the purpose of an isolation transformer is to remove the earth reference for the line and the neutral. It is not there to remove the earth connection from a chassis.
There are exceptions to this, but you want to be careful, especially when hooking up test equipment which will likely be earthed itself.

bd139:
Yep. There be dragons all around.

I tend not to use my isolation transformer at all preferring the one built into the DUT. If the primary side of a switcher has gone bang, all diagnostics are done 100% off line. If mains is poorly wired or exposed this is fixed before proceeding. In the case of the deadly Fluke 8000A the entire device is run off D.C. after the transformer taps on a bench supply.

My isolation transformer is a monster as well so I can’t be fucked with getting it out.  It’s an 3KVA variac with two back to back 50v transformers. Weighs about 30kg and lives in the cupboard under the stairs. Cost me £0 if I took it away which I did and it hasn’t moved for about 8 years. Plus it’s probably more dangerous than not using one.

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