Come off it.
Come off what?, are you seriously going to try and defend recommending using a scope probe to drop mains voltage? is this seriously where you are going here? your advice is really bad and is dangerous in fact theres no argument here
What is that your argument? no counter point or justification its just total rubbish Mike has spoken and thats final?
To which I answered no. There is nothing that can be done from within the scope.
Mike you are trying to move the goal posts, sorry but read his post he asked is there no other way and you seem to think its a definite no!!! my brain is fully engaged
Scopes are connected to ground and the mains is referenced to ground there is no need to do anything with the ground. You can simply measure the mains by connecting one end of the probe to it. I have done it many times in the past without problem.
Mike you are exposing your lack of knowledge you seriously havent got a clue have you, RCD's trip when you try and do what you are doing because you put the load in parallel with the 1M input impedance and you get earth leakage thats why you should use a floating scope and that doesn't mean disconnecting the earth that is what cowboys do
I have sped up the motorway many times does that mean its risk free?
That is an insult and a total misunderstanding about measurement. Yes you can remove the ground from a scope and operate it quite safely like that. It is not being a cowboy or a chancer it is knowing what you are doing.
Maybe it is because I am old and not brought up with the over arching nanny health and safety culture but I do not subscribe to the world view that you must protect everything as if people were idiots.
Yes working with mains requires that you know what you are doing, and it can be dangerous if you don't but do not paralyses yourself or go into back somersaults trying to prevent something stupid because people can always out stupid any precautions.
Mike you deserve to be insulted here because what you are advising is dangerous and not recommended, I have seen your style Mike constantly berating n00bs and making out like you are some kind of Guru, sorry Mike but this is well above the level of decoupling or fitting pull ups what you are saying isn't right and someone needs to point it out to you but given the amount of arguments I have seen you involved in I would be amazed if you admit that you are wrong and I can see where you are going with the veiled insults I won't get in an argument with you but I will debate this and I will show you why you are wrong so leave the pathetic arguments at the door and debate
I am not even going to argue with removing an earth from a scope to get a measurement its a ridiculous thing to do, its so rough I can't find the words but any professional engineer wouldn't dream of it they would buy some differential voltage probes
There is no way you will trip an RCD by taking a scope measurement, do you actually know what you are talking about?
Yes Michael I know what I am talking about, I know much more than you do about this because its what I do, I spent a long time of my working life working on mains, I was an electrician for a long time and I am very experienced and extremely qualified. I now work in commercial electronics development professionally every day and I am also a PhD student in power electronics, I build mains voltage power converters and I have a lot of experience in this area.
I have spent a lot of time and money getting my equipment and I know exactly what I am talking about, if you connect an earth referenced scope to a circuit to measure mains then you get earth leakage its so blindingly obvious I can't believe you are arguing (well I can actually), if you have an RCD then it will trip as soon as the load you are measuring is below a certain impedance
Do the math and work out how much impedance it takes in parallel with 1M to give 30mA leakage @325V
Don't take my word for it though go and educate yourself
Dave Jones on what I am talking about (shock horror @the name of the video!!)
To think you are back here arguing that its OK to unearth a scope to do a measurement instead of buying a proper set of differential probes (mine were over £600) and the required safety equipment I mean does this sound professional to you?
To think a n00b comes in here and you don't even mention safety but go on to recommend using a probe to attenuate mains its ridiculous (check a standard probes data sheet, standard probes are not designed to do this) and you are showing a massive lack of understanding and respect for safety
If you remove an earth from a scope (many times in your words) to do a measurement instead of getting the proper equipment then you are a cowboy Mike a massive cowboy and you wouldn't last five minutes working for me
Now leave your pathetic insults and arguments at the door and debate, tell me why you think I am wrong