SGare
Member
A 1:1 isolation transformer is a safety must for floating an open chassis piece of equipment that you have under test while using an oscilloscope.
1:1 isolation transformers are expensive so what's the alternative????? build your own DIY version, so please throw in your experiences for a cheap work around to the problem.
http://www.youtube.com/watch?v=xaELqAo4kkQ
My findings so far;
1. modify MOT (microwave oven) transformers. (use two identical units cut them open with an angle grinder and rebuild one of them using the two primary's, spot welding back together or bolting them back together at the disadvantage of destroying/damaging the core.
http://www.youtube.com/watch?v=iru58TO14x4
2. Still using the two MOT transformers but this time leaving the primaries in tack but cutting the 2000v secondary's away, rewiring with fresh wire and joining them using two transformers to get your 1:1 ratio.
http://www.youtube.com/watch?v=QDSmv9E5VgQ
http://www.raphnet.net/electronique/isolation/isolation_en.php
QUESTION.....What would you wind in the middle of the two,,,,size of wire/number of turns?
3. Using a common 12v car to mains invertor to run your oscilloscope off. (its a pain dragging car battery's round and acid in my lab/house is not desirable)
4. if you have a small generator at hand using that.....(sadly I don't have this option).
So Guys using MOT transformers are ready available that people chuck out and are cheap but the disadvantage is cracking them open destroys the core, so does anybody have experience of joining two of them together? What did you do?
Oh bye the way I'm in the UK on 240v
1:1 isolation transformers are expensive so what's the alternative????? build your own DIY version, so please throw in your experiences for a cheap work around to the problem.
http://www.youtube.com/watch?v=xaELqAo4kkQ
My findings so far;
1. modify MOT (microwave oven) transformers. (use two identical units cut them open with an angle grinder and rebuild one of them using the two primary's, spot welding back together or bolting them back together at the disadvantage of destroying/damaging the core.
http://www.youtube.com/watch?v=iru58TO14x4
2. Still using the two MOT transformers but this time leaving the primaries in tack but cutting the 2000v secondary's away, rewiring with fresh wire and joining them using two transformers to get your 1:1 ratio.
http://www.youtube.com/watch?v=QDSmv9E5VgQ
http://www.raphnet.net/electronique/isolation/isolation_en.php
QUESTION.....What would you wind in the middle of the two,,,,size of wire/number of turns?
3. Using a common 12v car to mains invertor to run your oscilloscope off. (its a pain dragging car battery's round and acid in my lab/house is not desirable)
4. if you have a small generator at hand using that.....(sadly I don't have this option).
So Guys using MOT transformers are ready available that people chuck out and are cheap but the disadvantage is cracking them open destroys the core, so does anybody have experience of joining two of them together? What did you do?
Oh bye the way I'm in the UK on 240v