Weird problem in Full wave (FW) bridge rectifier

I am working on implementation of FW bridge rectifier (without any
filter). I am applying a sinusoidal input (1 Phase, +- 20, 60 Hz) to
the bridge and measuring the voltage across the load resistance. When
I am trying to dispaly the output waveform in a CRO, I am seeing
only one half of the rectified waveform. I cross checked the
individual diodes and I found that all are in perfect condition and
working nice when using in HW rectifier mode. I want to know why I am
seeing such a wierd results.

 

[Greg Neill]

<dkmishra@gmail.com> wrote in message
news:1199dac4-d21b-48a4-b2f8-20ebcc09cc82@w28g2000hsf.googlegroups.com...

I am working on implementation of FW bridge rectifier (without any
filter). I am applying a sinusoidal input (1 Phase, +- 20, 60 Hz) to
the bridge and measuring the voltage across the load resistance. When
I am trying to dispaly the output waveform in a CRO, I am seeing
only one half of the rectified waveform. I cross checked the
individual diodes and I found that all are in perfect condition and
working nice when using in HW rectifier mode. I want to know why I am
seeing such a wierd results.

Where are you taking your ground reference from for
the oscilloscope measurement?

 

On Nov 21, 12:06 pm, "Greg Neill" <gneill...@OVEsympatico.ca> wrote:

dkmis...@gmail.com> wrote in message

news:1199dac4-d21b-48a4-b2f8-20ebcc09cc82@w28g2000hsf.googlegroups.com...

I am working on implementation of FW bridge rectifier (without any
filter). I am applying a sinusoidal input (1 Phase, +- 20, 60 Hz) to
the bridge and measuring the voltage across the load resistance. When
I am trying to dispaly the output waveform in a CRO, I am seeing
only one half of the rectified waveform. I cross checked the
individual diodes and I found that all are in perfect condition and
working nice when using in HW rectifier mode. I want to know why I am
seeing such a wierd results.

Where are you taking your ground reference from for
the oscilloscope measurement?

YES

 

[Greg Neill]

<dkmishra@gmail.com> wrote in message
news:43c7b03f-ed86-46b6-bf38-6b63473e02f7@d61g2000hsa.googlegroups.com...

On Nov 21, 12:06 pm, "Greg Neill" <gneill...@OVEsympatico.ca> wrote:
dkmis...@gmail.com> wrote in message


news:1199dac4-d21b-48a4-b2f8-20ebcc09cc82@w28g2000hsf.googlegroups.com...

I am working on implementation of FW bridge rectifier (without any
filter). I am applying a sinusoidal input (1 Phase, +- 20, 60 Hz) to
the bridge and measuring the voltage across the load resistance. When
I am trying to dispaly the output waveform in a CRO, I am seeing
only one half of the rectified waveform. I cross checked the
individual diodes and I found that all are in perfect condition and
working nice when using in HW rectifier mode. I want to know why I am
seeing such a wierd results.

Where are you taking your ground reference from for
the oscilloscope measurement?

YES

"YES"? That's not a helpful response.

 

On Nov 21, 1:59 pm, "Greg Neill" <gneill...@OVEsympatico.ca> wrote:

dkmis...@gmail.com> wrote in message

news:43c7b03f-ed86-46b6-bf38-6b63473e02f7@d61g2000hsa.googlegroups.com...> On Nov 21, 12:06 pm, "Greg Neill" <gneill...@OVEsympatico.ca> wrote:
dkmis...@gmail.com> wrote in message

news:1199dac4-d21b-48a4-b2f8-20ebcc09cc82@w28g2000hsf.googlegroups.com...



I am working on implementation of FW bridge rectifier (without any
filter). I am applying a sinusoidal input (1 Phase, +- 20, 60 Hz) to
the bridge and measuring the voltage across the load resistance. When
I am trying to dispaly the output waveform in a CRO, I am seeing
only one half of the rectified waveform. I cross checked the
individual diodes and I found that all are in perfect condition and
working nice when using in HW rectifier mode. I want to know why I am
seeing such a wierd results.

Where are you taking your ground reference from for
the oscilloscope measurement?

YES

"YES"? That's not a helpful response.

I resolved the problem. I was using input signal from the function
generator of oscilloscope. I came to know that If you are feeding it
a signal (~) that goes from oscilloscope ground to
a positive voltage, there will be no negative part of the waveform
when we measure it with oscilloscope. I then tried a transformer's
output as the input and problem got resolved.