Electronics > Beginners
Full bridge rectifier shows wrong curve on scope
Jwillis:
I did the same experiment and mine does the same thing. It's like the small voltage from the generator doesn't go below zero.So it's not a true AC sine wave.Simplest solution is use a low voltage transformer to test your rectifier.
Fenton Bresler:
I'll have another go.
Your sig gen is single ended i.e. the entire signal is on one wire. The other is ground.
Jwillis:
Would over lapping the A channel and B channel work? I don't have a second cord to try that.
StillTrying:
The OP says he's already floated the signal generator and/or scope so it must be something else.
It should be easy enough to trouble shoot it just the with scope's GND on the generators GND, the +Ve sine peaks should be on the +Ve bridge output and the -Ve sine peaks on it's -Ve output. Simples!
mikerj:
--- Quote from: Jwillis on January 06, 2020, 01:26:26 am ---I did the same experiment and mine does the same thing. It's like the small voltage from the generator doesn't go below zero.So it's not a true AC sine wave.Simplest solution is use a low voltage transformer to test your rectifier.
--- End quote ---
That's a pretty terrible signal generator if the output can not swing below ground. Easiest method would be to add a capacitor in series with the sig gen output to remove the DC offset.
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