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Shurafa

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Hello

When was the last time you used an oscilloscope?

When was the last time you needed an oscilloscope?

Regards- Ali M. Al-Shurafa
Aubrey

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We used an oscilloscope in order to see high frequency voltage on a VFD motor. Used with a rogowski coil to show the grounds going back to the drives were not connected correctly.

The oscilloscope needed to have a high enough range in order to see the spikes.

I was just a set of hands for the task. But I did get to see how it works.

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Shurafa

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Aubrey,

Thanks for the fast response.

Are these vibration applications? I assume the voltage targeted is higher than 30vdc.

How frequently this done?

Regards- Ali M. Al-Shurafa
John from PA

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Quote:
Originally Posted by Shurafa
Hello When was the last time you used an oscilloscope? When was the last time you needed an oscilloscope? Regards- Ali M. Al-Shurafa


If you mean an oscilloscope in the classic sense of a display on a CRT type of screen probably sometime likely in the late 1990's.  Even then it was a tool for training.  Things like ADRE and System 1 offer display of waveforms which essentially just a different method of displaying the data.
Shurafa

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Quote:
Originally Posted by John from PA


If you mean an oscilloscope in the classic sense of a display on a CRT type of screen probably sometime likely in the late 1990's.  Even then it was a tool for training.  .


Yes, I'm referring to the traditional oscilloscopes. Using them for educational and training purposes makes some valid justification, possibly if other tools (real) are not available for training.

In fact, I'm asking this question because I see some references (for the vibration institute for example) still use them.

Is this topic relevant to the current practices in the industry?

Regards- Ali M. Al-Shurafa
OLi

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Every day to verify output from produced instruments. In direct connection to vibration work, rarely and more so. Systems provide TWF enough if required. Olov
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jvoitl

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Would love to have a scope today, not for vibration although may find some limited use there, but for electronic tests.
Aubrey

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Sorry for the late reply,

We only used it to find if the ground was right. The VFD was causing fluting on the bearing and Ron Brook said we needed to do this in order to see what high frequency voltage was present.

We used this, found the high frequency voltage, and then improved the grounds. Didn't have any issues after this.


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vogel

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Reply with quote  #9 
I do not use them often since most vibration related tasks can be done with an analyzer (or online system). However, I find oscilloscopes useful when I need to have some sensor output verified by an instrumentation technician who is not experienced with vibration analyzers.
Dan Timberlake

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http://www.gus-stories.org/april_1959.htm
Ron Brook

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Reply with quote  #11 
Hey Aubrey!!!!
What Aubrey is referring to is the need for an Oscope to see the current spikes that occurring up to 10 MHz.  Can't see those on any fft analyzer.  Don't go high enough in frequency.
Ron  Brook
Walt Strong

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Reply with quote  #12 
Hi Dan,

Thanks for the link to the Gus-stories. I grew up in my father's auto repair shop since I could walk. I'm sure I will find some interesting stories in my spare time.

I have a storage oscilloscope in my workshop that I have not used in years. It is there in case I need it, and I say that about a lot of other tools that I have not used in quite a while!

Walt
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