Electronics > Beginners

Full bridge rectifier shows wrong curve on scope

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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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