Household mains isolator for safe oscilloscope measurements More details on 220v receptacle expander in GADGETS#55 DOWNLOAD build info here: github.com/theGADGETSplaylist...
This is a very nice gadget, but if you only want to measure between L1 and N or between L2 and N, you don't need anything extra. Simple disconnect the negative clip from your scope probe for safety purpose, set your probe to x10, and touch the L1 or L2 with the tip of your scope probe. The outer connection of the BNC connector on the scope is already connected to ground and so does your probe, and because L1 or L2 are earth referenced, you only need to touch L1 or L2 to measure the 120V mains voltage. For countries that use 230V/240V, the same method of only touching the L1 can be used. Grtz
Interesting. Could it be used as a isolationtransformer for lower voltages and non sinuswaveforms? I was thinking about using them to have each channel isolated so you could measure inside a circuit ie as a differential probe.
Did you measure the cut-off frequency of this ZMPT101 module ? It's not mentioned in the datasheet. Maybe it could be used to provide input isolation to measure 2 signals with a different voltage reference or to safely analyse switching noise.
ZMPT101 is a transformer so I doubt there is much frequency limitation from it but on that board is LM358 Op Amp and it would have some limitations (though quite high, I suspect) here is specs on LM358 if that helps: www.onsemi.com/pdf/datasheet/lm358-d.pdf
please correct me if I am wrong. It would appear that the earth has been disconnected and you have floating mains supply and may well bypass the RCD RCBO or other safety device
Brilliant as always.
thank you
Excellent design. You never cease to amaze me! Again, another well done project.
thank you
Another nice project. I used the same voltage module but with DPScope oscilloscope.
cool!
yes, they're nice those voltage modules...
nice work
Great Project Denis👍🏼
thx Ramon:)
Another great project!!
thanks so much Bill:)
Nice clean design Denis👍
been cool and rainy since your visit...so I had time to sneak in another GADGET:)
Great job, useful for safely illustrating mains waveform.
thank you for your comment Mohamed:)
Wow, interesting project, I didn't see this one!
slipped through the cracks:)
Clever 👍
thx Ian:)
This is a very nice gadget, but if you only want to measure between L1 and N or between L2 and N, you don't need anything extra.
Simple disconnect the negative clip from your scope probe for safety purpose, set your probe to x10, and touch the L1 or L2 with the tip of your scope probe.
The outer connection of the BNC connector on the scope is already connected to ground and so does your probe, and because L1 or L2 are earth referenced, you only need to touch L1 or L2 to measure the 120V mains voltage. For countries that use 230V/240V, the same method of only touching the L1 can be used. Grtz
hmmm...these are ±5v input scopes...are you sure about this?
@@theGADGETSplaylist , for 5V input scopes, this method can't be used with a x10 probe, only with probes with x100 attenuation. Grtz
Another cool gadget! Having a 3D printer opens up so many possibility's.
handy little things 4sure!
Interesting.
Could it be used as a isolationtransformer for lower voltages and non sinuswaveforms?
I was thinking about using them to have each channel isolated so you could measure inside a circuit ie as a differential probe.
these modules would not be suited for that purpose...ok for sine waves...and maybe triangular waves also...but not other wave patterns
Did you measure the cut-off frequency of this ZMPT101 module ? It's not mentioned in the datasheet. Maybe it could be used to provide input isolation to measure 2 signals with a different voltage reference or to safely analyse switching noise.
ZMPT101 is a transformer so I doubt there is much frequency limitation from it
but on that board is LM358 Op Amp and it would have some limitations (though quite high, I suspect)
here is specs on LM358 if that helps:
www.onsemi.com/pdf/datasheet/lm358-d.pdf
please correct me if I am wrong. It would appear that the earth has been disconnected and you have floating mains supply and may well bypass the RCD RCBO or other safety device
no earth used or required in this project