Electronics > Beginners

Oscilloscope for AC work ?

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rsjsouza:
As others have mentioned, you really can't go wrong with a CAT III or CAT IV rated scope such as:
https://www.fluke.com/en-us/product/electrical-testing/portable-oscilloscopes/190-series-ii/fluke-190-ii-190-102-s

(edit) but perhaps something a bit cheaper but still reputable could be this Chauvin Arnoux:
https://www.aemc.com/products/oscilloscopes/oscilloscope-ox5022

tautech:

--- Quote from: bdunham7 on May 04, 2019, 12:30:18 am ---
--- Quote from: Benta on May 03, 2019, 07:55:38 pm ---

I fully agree.
The only correct way of measuring mains on a 'scope is using high voltage differential probes. Everything else is a recipe for killing yourself.
Don't even think about battery 'scopes or isolation transformers.

--- End quote ---

First, make sure that your differential probe is specifically suited for the task (CAT III or IV rated in this case) and remember that they are not completely isolated and have non-trivial input loads in some cases.

Second, why do you dismiss battery operated scopes?  A proper one is as safe as a proper DMM, and if you showed up as an electrician to work in a panel with anything else you'd be thrown out.

--- End quote ---
Unless they offer isolation for all channels and normally they only offer proper isolation for one channel before getting into the old ground loop scenario.  :rant:
Fully independent isolated channel scopes, handheld or bench top units are $ $ $.

rsjsouza:

--- Quote from: tautech on May 04, 2019, 12:47:48 am ---
--- Quote from: bdunham7 on May 04, 2019, 12:30:18 am ---
--- Quote from: Benta on May 03, 2019, 07:55:38 pm ---

I fully agree.
The only correct way of measuring mains on a 'scope is using high voltage differential probes. Everything else is a recipe for killing yourself.
Don't even think about battery 'scopes or isolation transformers.

--- End quote ---

First, make sure that your differential probe is specifically suited for the task (CAT III or IV rated in this case) and remember that they are not completely isolated and have non-trivial input loads in some cases.

Second, why do you dismiss battery operated scopes?  A proper one is as safe as a proper DMM, and if you showed up as an electrician to work in a panel with anything else you'd be thrown out.

--- End quote ---
Unless they offer isolation for all channels and normally they only offer proper isolation for one channel before getting into the old ground loop scenario.  :rant:
Fully independent isolated channel scopes, handheld or bench top units are $ $ $.

--- End quote ---
Exactly. The OP's specs simply have way too much energy to fool around with cheaper alternatives.

bdunham7:

--- Quote from: tautech on May 04, 2019, 12:47:48 am ---
Unless they offer isolation for all channels and normally they only offer proper isolation for one channel before getting into the old ground loop scenario.  :rant:
Fully independent isolated channel scopes, handheld or bench top units are $ $ $.

--- End quote ---

I would think that one channel at a time would be a given unless you have an instrument specifically designed for 3-phase power analysis--and I think that would be way beyond the OP's needs.  Using only one ground lead is standard ScopeMeter technique.  I suppose three HV differential probes would get the job done, but who has that?

tautech:

--- Quote from: bdunham7 on May 04, 2019, 01:39:39 am ---
--- Quote from: tautech on May 04, 2019, 12:47:48 am ---
Unless they offer isolation for all channels and normally they only offer proper isolation for one channel before getting into the old ground loop scenario.  :rant:
Fully independent isolated channel scopes, handheld or bench top units are $ $ $.

--- End quote ---

I would think that one channel at a time would be a given unless you have an instrument specifically designed for 3-phase power analysis--and I think that would be way beyond the OP's needs. 
--- End quote ---
Not so much.
While not as good as an differential probe Siglent's ISFE works OK and offers 2 isolated channels:
https://www.siglentamerica.com/accessory/isolated-channel-optional-accessories%EF%BC%88isfe%EF%BC%89/
Note, the BNC spacings and F-F adapters are such to fit directly onto any Siglent DSO and that may not allow other brands connection without additional BNC leads.

--- Quote ---Using only one ground lead is standard ScopeMeter technique.  I suppose three HV differential probes would get the job done, but who has that?

--- End quote ---
Those that want to view 3 phase mains with entry level equipment.
Cheap 4ch DSO + 3 differential probes is still cheaper than any isolated channel scope, HH or bench top.

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