Author Topic: siglent sdg830 behavior  (Read 947 times)

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Offline arivelTopic starter

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siglent sdg830 behavior
« on: November 23, 2022, 05:00:32 pm »
Hello.
for reasons that I am not going to specify in detail , I find myself having to use a different and much more recent and modern function generator than the one I have always used , it is a silent sdg830 .
for demonstrative purposes I have built a simple rectifier circuit with a 4 diode bridge fed by a sinusoidal signal coming from the function generator.
what appears on the oscilloscope is not what it should be because only one half-wave is seen and not both rectified.
can someone explain me why?
 

Offline tautech

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Re: siglent sdg830 behavior
« Reply #1 on: November 23, 2022, 07:32:27 pm »
Hello.
for reasons that I am not going to specify in detail , I find myself having to use a different and much more recent and modern function generator than the one I have always used , it is a silent sdg830 .
for demonstrative purposes I have built a simple rectifier circuit with a 4 diode bridge fed by a sinusoidal signal coming from the function generator.
what appears on the oscilloscope is not what it should be because only one half-wave is seen and not both rectified.
can someone explain me why?
A dud bridge or you've created a ground loop.
Try the measurement again with a differential probe.
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Some stuff seen @ Siglent HQ cannot be shared.
 

Offline arivelTopic starter

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Re: siglent sdg830 behavior
« Reply #2 on: November 24, 2022, 10:43:23 am »
with a transformer I see in the right way, I don't understand why with sdg830 instead not
 

Offline rf-loop

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Re: siglent sdg830 behavior
« Reply #3 on: November 24, 2022, 01:11:01 pm »
with a transformer I see in the right way, I don't understand why with sdg830 instead not

For educational purpose, please first draw schematic about your circuit.  Generator in left then bridge  and right oscilloscope input.
Draw it using pen and paper and also do not forget draw all routes where current flow. Including also both instruments GND. After then think.
You can also take picture about your schematic and display it here. :)
EV of course. Cars with smoke exhaust pipes - go to museum.
Wises must compel the mad barbarians to stop their crimes against humanity. Where have the (strong)wises gone?
 

Offline arivelTopic starter

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Re: siglent sdg830 behavior
« Reply #4 on: November 24, 2022, 06:48:35 pm »
I also tried with an integrated diode bridge but the result does not change.
I think there is some strange setting in the function generator
 

Offline tautech

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Re: siglent sdg830 behavior
« Reply #5 on: November 24, 2022, 06:56:24 pm »
I also tried with an integrated diode bridge but the result does not change.
I think there is some strange setting in the function generator
Stop and take a minute to consider the normal connection you might do for this.
Than ask which connection points are common, then consider what they might also be in common with.
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Some stuff seen @ Siglent HQ cannot be shared.
 

Offline rf-loop

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Re: siglent sdg830 behavior
« Reply #6 on: November 25, 2022, 06:04:42 am »
I also tried with an integrated diode bridge but the result does not change.
I think there is some strange setting in the function generator
Stop and take a minute to consider the normal connection you might do for this.
Than ask which connection points are common, then consider what they might also be in common with.

Please read my last post and follow it to stop your circular thinking. Now you just repeat your test over and over without bothering to solve the problem.
(I naturally assume that you are using both devices according to their instructions both connected to a protectively grounded power source.
Think what that means... (since (I assume) you are using a normal oscilloscope probe and not a differential probe isolated from GND)
If you read my previous post and follow it, you will have solved this problem in less than a half minute without any more repeating the same test and wandering your mind on everything else but not the root problem itself.) ;)
EV of course. Cars with smoke exhaust pipes - go to museum.
Wises must compel the mad barbarians to stop their crimes against humanity. Where have the (strong)wises gone?
 


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