/diy/ - Do It Yourself

>>1443863
Maybe

>>1443866

explain !!!

also, how do i calculate how much power will be going into the scope?

>>1443867
Fuck if I know. I’m trying to figure out if I should store my multimeter with batteries in them or take them out before they explode.

This board is slow. Post it in the /ohm/ thread because that’s kinda busy but it seems like those nerds rarely leave their generals to answer other questions.

>>1443863
You don't seem to understand transformers or oscilloscopes or basic electronics.

The secondary winding is BY DEFINITION isolated from the mains because it's a TRANSFORMER.

Now, if your 'scope has a hi-Z input impedance (like 10M ohm) then the CURRENT will be small and then it's only a matter of the 'scope being able to handle the voltage (which you didn't mention). If it's got a 50-ohm input impedance then you should NOT be connecting more than, say, 5 volts pk-pk to it, you'll damage the input channel.

Now, why do you want to connect a power transformer to your 'scope? What are you trying to accomplish?

>>1443871
>You don't seem to understand transformers or oscilloscopes or basic electronics.
How to be right but still be an asshole in one easy step.
>The secondary winding is BY DEFINITION isolated from the mains because it's a TRANSFORMER.
doesn't have to be, but nearly always is. It's only 'by definition' in, eg, class-II.
>Now, if your 'scope has a hi-Z input impedance
aaaand we're off to the races.
Scopes (on mains power) by convention have a floating input ground.you can connect it to anything. The grounds of all the channels are usually tied together though, so you can't have multiple 'grounds'.
>Now, why do you want to connect a power transformer to your 'scope? What are you trying to accomplish?
To look at the output. Duh.

>>1443878
The only thing worse than an ignorant cunt is an ARROGANT ignorant cunt. I've only been working in electronics for about 35 years, but sure kid you've been dinking around in it for a few months and know everything already.

>>1443880
>I've only been working in electronics for about 35 years,
Noice. Let me know when you hit 40. 'cept I'll still be ahead.

>>1443871
>>1443880
>>1443881

gentlemen! you can't fight in here, this is the war room!

thanks for the tips though. the input on the scope is 1 M ohm. the output of the transformer is 12.7 V. so the current and power are tiny. hooked it up, nothing blew up! yay!

i was worried because i don't understand how scopes are grounded.

>>1443892
Ur fine. It's when you measure a load with reference to the drain of a mos to the high side of a load that ull blow the mos.... Maybe it the other way around? I dunno I'm hammered. I did this once years ago and killed a 20 dollar one.

>>1443878
Aren't scopes ground tied to earth? That's why most people use isolation transformers with them

>>1443924
Absolutely typically scope ground is supply ground
You shouldn't float a scope because it has plenty of exposed metal parts like bnc connectors that will become live and possibly dangerous.
What you should do is
1) float the device under test (in this case we hope the transformer is floating) the scope will ref to ground.
2) ignore useless 'advice' from self important tripfags trying to ruin this board.

https://youtu.be/XBsQ3sZ45Fk

Mr Carlson did a pretty good video about this topic

>>1443931
>>1443924
the other alternative is investing in a (used) handheld scope for field service.
They are small and run on battery.
Old ones can be shot for sub 200$

>>1443931
3) use both channels to make differential measurements instead of floating the scope
there's no reason to float a (2-channel) scope, or to float the DUT.

>>1443924
>Aren't scopes ground tied to earth?
When they are, it's true earth, and isolated in some way from the supply. Like I said, it's a convention and not universal. That said, I'm used to the golden oldies like Tek and HP.