Products > Test Equipment
Differential probe for offline PFC'd PSU
<< < (5/7) > >>
n1ist:
Someone tried to float a scope at work.  I then had to help them remove the scope from the grounded box they had it sitting on with a crowbar and saw after the rubber feet failed and the scope spot-welded itself in place.

Remember that not only will metal parts of the scope be hot, but the insulation on the rest of the scope (and mouse and keyboard, etc.) aren't designed for high voltage isolation.  Also, don't try connecting the ground clips of different probes to different places or the probe cables will light up.

If you must float a scope, use one of the battery powered ones that are designed for floating; they are aimed more towards electricians than electronic design, but they would be safe.  Otherwise, float the DUT and use diff probes.
/mike
jc101:
Telonic have several differential probes in stock...

https://telonic.co.uk/product-category/test-measurement/test-measurement-manufacturer-accessories/micsig-accessories/
Faringdon:

--- Quote ---but the insulation on the rest of the scope (and mouse and keyboard, etc.) aren't designed for high voltage isolation.
--- End quote ---
Thanks,
The one thing that coudl get popped by floating only the scope, woudl be the scopes Y caps....but i reckon a 1MEG 1kv resistor from scopes (isolated) "neutral", connected to real neutral, woudl prevent any overvoltage to the said Y cap.

Excellent points about not touching parts of the scope...the thing is trying to remember to turn off the  DUT every time you move the scope ground clip lead thing.......also, turning off the scope would be best in that situation...but would be a pain as v/div etc woudl all need resetting every time you move the probe.
jc101:

--- Quote from: Faringdon on July 13, 2022, 02:45:07 pm ---
--- Quote ---but the insulation on the rest of the scope (and mouse and keyboard, etc.) aren't designed for high voltage isolation.
--- End quote ---
Thanks,
The one thing that coudl get popped by floating only the scope, woudl be the scopes Y caps....but i reckon a 1MEG 1kv resistor from scopes (isolated) "neutral", connected to real neutral, woudl prevent any overvoltage to the said Y cap.

Excellent points about not touching parts of the scope...the thing is trying to remember to turn off the  DUT every time you move the scope ground clip lead thing.......also, turning off the scope would be best in that situation...but would be a pain as v/div etc woudl all need resetting every time you move the probe.

--- End quote ---

You're working alone, in a closed room, what happens to you if you do manage to fry yourself or the kit?  Anyone else about know what to do to revive you?  What is the protection of the power in your room, could you trip an RCB or RCBO (assuming it actually has protection if course...) with an isolated scope?

You life I suppose, but right tools for the job and all that seems to apply here.
nez:
If the reason to not order from Bangood is the shipping delay, why not order one from the shop that jc101 linked to?  The prices are good there too.
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod