Hello everyone.
I just realized something strange playing around with a simple voltage doubler.
The doubler works fine. I use a signal generator as input. A simple DMM measures the DC output.
The thing is: just cliping a scope's probe clip to the circuit can make it go crazy.
Attached, two scope captures.
First, probe earth clip is connected to signal generator's negative terminal. Ok.
Second, with earth clip swapped (clip to positive output, probe tip to signal generator negative terminal).
That disturbs the operation so badly! 90V peak!
The siggen is not earthed (it is powered from a two prong power cable) and I see no reason for this to happend...
The DMM can measure any two points in the circuit with no problem whatsoever.
There must be something importanted I'm missing. Any idea?
If I attach the scope directly to the siggen, nothing is wrong either polarity. The issue shows up with the voltage doubler...
The signal just seems more stable if I attach the earth to the signal generator negative terminal.
Thank you!
I just realized something strange playing around with a simple voltage doubler.
The doubler works fine. I use a signal generator as input. A simple DMM measures the DC output.
The thing is: just cliping a scope's probe clip to the circuit can make it go crazy.
Attached, two scope captures.
First, probe earth clip is connected to signal generator's negative terminal. Ok.
Second, with earth clip swapped (clip to positive output, probe tip to signal generator negative terminal).
That disturbs the operation so badly! 90V peak!
The siggen is not earthed (it is powered from a two prong power cable) and I see no reason for this to happend...
The DMM can measure any two points in the circuit with no problem whatsoever.
There must be something importanted I'm missing. Any idea?
If I attach the scope directly to the siggen, nothing is wrong either polarity. The issue shows up with the voltage doubler...
The signal just seems more stable if I attach the earth to the signal generator negative terminal.
Thank you!