Isolation of the RIGOL DS1054Z from the mains with two transformers

[bdunham7]

Knowledge of physics at university level is sufficient to avoid making such stupid mistakes.

Having completed a university degree in that very subject years ago, I'd say that if you paid attention (and did the math) you would acquire sufficient knowlege and ability to be able to learn the details of many fields such as electronics, mechanical engineering and so forth.  However if you imagine that with that level of education that you already know all those things, then you're a flaming idiot.  And if you screw up what you're attempting, the 'flaming' might be literal, as suggested by your comment:

Transformers and fuses ordered to isolate the oscilloscope from the power socket 

So what specific hazard are you intending the fuses to guard against?  Where will you place them? And how did you size them? 

[eneuro]

So what specific hazard are you intending the fuses to guard against?  Where will you place them? And how did you size them? 

 

[coppercone2]

you know that picture is at a source impedance in the god knows how many ohms and mains impedance is in the miliohms.

[bdunham7]

Someone--who I loathed at the time and probably still do--once told me that if you can't clearly express something that you think you know, then you clearly don't actually know it.  Or something like that.  That's not always completely true, but I've found it to be so more often than I would have originally expected.

[IanJ]

Transformers and fuses ordered to isolate the oscilloscope from the power socket

So you’ll build it, it’ll work and you’ll have a smile on your face……..till one day you make a mistake (as we all do no matter what experience) and you’ll blow the back side off your test gear…….or worse.
I don’t need to tell you what mistakes you could make, it’s obvious.

Ian.

[wasedadoc]

Rarely has the expression "It's your funeral" been so apposite and literal.

[eneuro]

..till one day you make a mistake (as we all do no matter what experience) and ...

Nobody is perfect. I'm nobody. 


Don't disturb a genius at work 

[Andy Chee]

Don't disturb a genius at work 

Not sure what your schematic is supposed to show.  Mains powered microcontroller?

I posted a document along those lines in another thread, which you may be interested in:

https://ww1.microchip.com/downloads/en/appnotes/00954a.pdf

[eneuro]

I posted a document along those lines in another thread, which you may be interested in:

Nope, It is not the control system that is supposed to generate infrared light, but a 100W IR bulb, but In this document they propose the use in section

FIGURE 5: RESISTIVE POWER SUPPLY

10W 2k resistor   at 110VAC mains voltage and in addition I have not 110VAC but 230VAC from the socket 

[Andy Chee]

in addition I have not 110VAC but 230VAC from the socket 

If needed, use the math formulas to recalculate using 230VAC 50Hz.

I agree, the resistive power supply is a waste of energy.  But the capacitive power supply is the more practical one.

[eneuro]

I agree, the resistive power supply is a waste of energy.

Not true, because it depends on the environment in which the system powered in this way is to operate, because when I control a 100W IR lamp to heat a room, there is no loss of energy because the <1W used to power the control system does not matter, especially since the whole thing is turned on by a switch, so there is no power consumption when there is no need to use the lamp. 

[Andy Chee]

because when I control a 100W IR lamp to heat a room

Here's another lamp dimmer, using capacitive drop power supply, and using a triac (instead of MOSFET).  It can be recalculated for 230VAC 50Hz.

https://ww1.microchip.com/downloads/en/AppNotes/40171a.pdf

The 12C508 is old, and could be upgraded to a 12F675 or ATtiny, if required.

[eneuro]

It can be recalculated for 230VAC 50Hz.

I am not looking for any circuit schematics of the system to control my IR lamp because I have already tested it in the simulator, I am just preparing a PCB in KiCad and software for AVR, as well as an isolated oscilloscope and a logic analyzer to check whether everything works as predicted by the computer simulation. 
Transformers are already nearby 

[Andy Chee]

I am not looking for any circuit schematics of the system to control my IR lamp because I have already tested it in the simulator

At the beginning of this thread, you asked questions about two transformers for isolating your oscilloscope, because you were not sure.

How can you be sure about your circuit simulation?