Bridge Rectifier not giving full-wave rectification

[lsiu]

Hi,
I have a circuit like this
(http://lsiu.dyndns.org/static/circuits/supply01.png). When I tried it out
on the scope with a 60Hz sine wave function generator with output 10 Vpp, I
only get half-wave rectification reading from my oscilloscope. The
connection from the function generator goes to the two ACs of the rectifier,
and the scope connects to the + and - of the rectifier. Any Ideas why I
don't get a full-wave rectification?

I am using this rectifier
(http://www.rectron.com/data_sheets/rs201l-rs207l.pdf)

Thanks for your help.

Leonard

 

[John Woodgate]

I have a circuit like this
(http://lsiu.dyndns.org/static/circuits/supply01.png). When I tried it out
on the scope with a 60Hz sine wave function generator with output 10 Vpp, I
only get half-wave rectification reading from my oscilloscope. The
connection from the function generator

One of which is ground....

goes to the two ACs of the rectifier,
and the scope connects

.....one of the connections being ground.

to the + and - of the rectifier. Any Ideas why I
don't get a full-wave rectification?

See above. Draw the grounds on your schematic.

 

[BFoelsch]

I can make a good guess-

I would guess that your function generator and your oscilloscope both have
their common terminals grounded to the case, which is in turn connected to
the earth ground through the power cord. Effectively, the black terminal on
the function generator is connected to the black terminal on the
oscilloscope. That would bypass one of the diodes in the bridge giving an
unexpected effect.

 

[Leon Heller]

Hi,
I have a circuit like this
(http://lsiu.dyndns.org/static/circuits/supply01.png). When I tried it out
on the scope with a 60Hz sine wave function generator with output 10 Vpp, I
only get half-wave rectification reading from my oscilloscope. The
connection from the function generator goes to the two ACs of the rectifier,
and the scope connects to the + and - of the rectifier. Any Ideas why I
don't get a full-wave rectification?

I am using this rectifier
(http://www.rectron.com/data_sheets/rs201l-rs207l.pdf)

Something to do with your grounding arrangement?

Leon

 

[Frank Bemelman]

Hi,
I have a circuit like this
(http://lsiu.dyndns.org/static/circuits/supply01.png). When I tried it out
on the scope with a 60Hz sine wave function generator with output 10 Vpp, I
only get half-wave rectification reading from my oscilloscope. The
connection from the function generator goes to the two ACs of the rectifier,
and the scope connects to the + and - of the rectifier. Any Ideas why I
don't get a full-wave rectification?

I am using this rectifier
(http://www.rectron.com/data_sheets/rs201l-rs207l.pdf)

Didn't you blew a fuse or something, with this experiment,
the other day?

Perhaps you blew one of the diodes in the bridge, and
need a new bridge.

 

[Baphomet]

Hi,
I have a circuit like this
(http://lsiu.dyndns.org/static/circuits/supply01.png). When I tried it out
on the scope with a 60Hz sine wave function generator with output 10 Vpp, I
only get half-wave rectification reading from my oscilloscope. The
connection from the function generator goes to the two ACs of the rectifier,
and the scope connects to the + and - of the rectifier. Any Ideas why I
don't get a full-wave rectification?

I am using this rectifier
(http://www.rectron.com/data_sheets/rs201l-rs207l.pdf)

Thanks for your help.

Leonard

You're lucky you didn't blow anything...or maybe you did. You should be
using an isolation transformer when working directly from the line. Absent
that, use ground cheaters on all of your measuring equipment.

 

[John Fields]

You're lucky you didn't blow anything...or maybe you did. You should be
using an isolation transformer when working directly from the line. Absent
that, use ground cheaters on all of your measuring equipment.

---
I don't think he meant that he had it hooked up to the mains, but rather
that the output of his function generator was hooked to the AC side of
the bridge and that he was trying to look at the output of the bridge
with his scope. Such being the case, he would get the waveform he saw
if the ground sides of the scope and function generator were common.

 

[Baphomet]

---
I don't think he meant that he had it hooked up to the mains, but rather
that the output of his function generator was hooked to the AC side of
the bridge and that he was trying to look at the output of the bridge
with his scope. Such being the case, he would get the waveform he saw
if the ground sides of the scope and function generator were common.

You may be right John. When I looked at his schematic, I saw the outlet
symbol, cringed, and posted.