Author Topic: Oscilloscope training class (long)  (Read 49420 times)

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Offline w2aew

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Re: Oscilloscope training class (long)
« Reply #15 on: June 29, 2011, 03:28:42 AM »

I've already subscribed! That's really great. I'm in school right now and I'm LOVING analog over digital. I'm hoping it'd be possible to do just that, debug on an analog level, but sadly, I feel as though systems have become far too complex in the last 10 years for me to be able to do that.



Armin - if you are interested in analog troubleshooting, I would highly recommend the "Troubleshooting Analog Circuits" book by Robert A. Pease.  Bob Pease just recently was killed, a tremendous loss to the Analog Design community.  Thankfully, he was a prolific writer, with a regular column (Pease Porridge) in the Electronic Design magazine.

Here's a link to Bob's troubleshooting book:
http://www.amazon.com/Troubleshooting-Analog-Circuits-Design-Engineers/dp/0750694998/ref=sr_1_1?ie=UTF8&qid=1309281830&sr=8-1
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Offline Armin_Balija

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Re: Oscilloscope training class (long)
« Reply #16 on: June 29, 2011, 10:32:44 AM »

I've already subscribed! That's really great. I'm in school right now and I'm LOVING analog over digital. I'm hoping it'd be possible to do just that, debug on an analog level, but sadly, I feel as though systems have become far too complex in the last 10 years for me to be able to do that.



Armin - if you are interested in analog troubleshooting, I would highly recommend the "Troubleshooting Analog Circuits" book by Robert A. Pease.  Bob Pease just recently was killed, a tremendous loss to the Analog Design community.  Thankfully, he was a prolific writer, with a regular column (Pease Porridge) in the Electronic Design magazine.

Here's a link to Bob's troubleshooting book:
http://www.amazon.com/Troubleshooting-Analog-Circuits-Design-Engineers/dp/0750694998/ref=sr_1_1?ie=UTF8&qid=1309281830&sr=8-1


That cover is amazing! Look at that jumbled mess of wires! Beautiful! I will definitely check it out! Thanks for the recommendation.

Offline w2aew

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Re: Oscilloscope training class (long)
« Reply #17 on: July 01, 2011, 06:45:39 AM »
FYI - I recently added another video to my YouTube channel that discusses the AC / DC Coupling control on the vertical channels of the scope - and how to get the most out of them.


Keep an eye on my channel for other short scope and measurement topics, and let me know if there's something you'd like to see.
http://www.youtube.com/w2aew
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Online vk6zgo

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Re: Oscilloscope training class (long)
« Reply #18 on: July 02, 2011, 01:24:50 AM »
Careful,w2aew,you might educate some of the people on this forum,so they can figure things out for themselves. ;D

A lot of beginners seem to think of an Oscilloscope as a Multimeter with a picture on the front, rather than the amazingly useful piece of equipment it is.
I'd like them to turn off all the additional readouts,& just learn to analyse a displayed waveform,as per your video.

73,VK6ZGO

Offline w2aew

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Re: Oscilloscope training class (long)
« Reply #19 on: July 02, 2011, 01:48:39 PM »
Careful,w2aew,you might educate some of the people on this forum,so they can figure things out for themselves. ;D

A lot of beginners seem to think of an Oscilloscope as a Multimeter with a picture on the front, rather than the amazingly useful piece of equipment it is.
I'd like them to turn off all the additional readouts,& just learn to analyse a displayed waveform,as per your video.

73,VK6ZGO


I hope I'm helping someone to get more out of their scope!  Here's another video that talks about the Trigger controls of an analog scope...


Enjoy!
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Online vk6zgo

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Re: Oscilloscope training class (long)
« Reply #20 on: July 03, 2011, 12:21:55 AM »
Seriously,though,these videos are great!

If I could have had something like that when I was a beardless youth,just learning how to drive an oscilloscope,I would have "thought all my birthdays had come at once!"

Unfortunately,I had to learn in "the School of hard knocks". ;D

They do say that experience is the best school,but the fees are very high!

VK6ZGO

Offline w2aew

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Re: Oscilloscope training class (long)
« Reply #21 on: July 03, 2011, 12:59:09 PM »
Seriously,though,these videos are great!

If I could have had something like that when I was a beardless youth,just learning how to drive an oscilloscope,I would have "thought all my birthdays had come at once!"

Unfortunately,I had to learn in "the School of hard knocks". ;D

They do say that experience is the best school,but the fees are very high!

VK6ZGO

Thank you - I'm glad you like them.  The ones on my Channel are just shorter topics that address questions that I received after people attended the "Scopes 4 Dopes" class I taught a few months ago to a local Antique Radio Club - or those that viewed the long video of the class (which is the video that is the first entry of this topic).

The school of hard knocks usually has the best lessons!  You know what they say - Good judgement comes from experience, but experience comes from bad judgement!

73,
Alan W2AEW
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Offline w2aew

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Re: Oscilloscope training class (long)
« Reply #22 on: September 11, 2011, 04:05:08 AM »
I've added a number of new videos to my YouTube channel regarding oscilloscope usage.  The two most recent additions illustrate how to properly simultaneously capture and visualize two signals that are at dramatically different frequencies.  These could be a baseband signal and it's modulated RF carrier for example (hmm, gives me another idea for a video...).

Here's the video of how it's done properly today with a modern digitizing oscilloscope first:
How to use the Oscilloscope to accurate capture 2 signals of different frequencies


And, here's how it was done "old school" before the days of digitizing scopes using a delayed timebase:
Using Analog scope to view two signals of wildly different frequencies


As always, comments and suggestions are always welcome!
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Offline Joshua

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Oscilloscope training class (long)
« Reply #23 on: September 11, 2011, 04:20:37 AM »
Just last night I was trying to find information about 1x vs 10x probes, ac vs dc coupling, and triggering. I found your channel and it was exactly what I was looking for! Great videos with great explanations! Thanks!
If you don't have time to do it right now, how will you have time to come back and fix it?

I'm not rich enough to buy cheap stuff.

Offline ToBeFrank

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Re: Oscilloscope training class (long)
« Reply #24 on: September 11, 2011, 11:03:54 AM »
I've added a number of new videos to my YouTube channel regarding oscilloscope usage.  The two most recent additions illustrate how to properly simultaneously capture and visualize two signals that are at dramatically different frequencies.  These could be a baseband signal and it's modulated RF carrier for example (hmm, gives me another idea for a video...).

Here's the video of how it's done properly today with a modern digitizing oscilloscope first:
How to use the Oscilloscope to accurate capture 2 signals of different frequencies


Do I understand it correctly that this is what Agilent's MegaZoom technology is for?

Offline w2aew

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Re: Oscilloscope training class (long)
« Reply #25 on: September 11, 2011, 11:51:09 AM »
Do I understand it correctly that this is what Agilent's MegaZoom technology is for?

I remember Megazoom as a memory management technology from Agilent's digital scopes from about a decade ago, like the 54600 series - to make it easy to navigate through deep record memory.  Of course, back then, 1Mpoints was considered deep memory.  Are they still using this Megazoom terminology today?
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Offline w2aew

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Re: Oscilloscope training class (long)
« Reply #26 on: September 11, 2011, 11:53:09 AM »
Just last night I was trying to find information about 1x vs 10x probes, ac vs dc coupling, and triggering. I found your channel and it was exactly what I was looking for! Great videos with great explanations! Thanks!

Joshua,
I'm glad you found the videos useful!  It's a good thing I did three videos specifically on those topics!!  Of course, please let me know if there are other similar topics that you'd like to see in the future.

Best Regards,
Alan
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Offline ToBeFrank

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Re: Oscilloscope training class (long)
« Reply #27 on: September 12, 2011, 02:10:54 AM »
Do I understand it correctly that this is what Agilent's MegaZoom technology is for?

I remember Megazoom as a memory management technology from Agilent's digital scopes from about a decade ago, like the 54600 series - to make it easy to navigate through deep record memory.  Of course, back then, 1Mpoints was considered deep memory.  Are they still using this Megazoom terminology today?

Yes, they are. I was really confused by your video. I couldn't figure out why your scope didn't always use all its acquisition memory. After some searching, I think this is because my scope has the MegaZoom feature. If I understand it correctly, MegaZoom allows them to always fill memory at max possible sample rate without affecting update rates. Thus, MegaZoom equipped scopes don't have a record length selection.

Offline w2aew

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Re: Oscilloscope training class (long)
« Reply #28 on: September 12, 2011, 06:03:47 AM »
Yes, they are. I was really confused by your video. I couldn't figure out why your scope didn't always use all its acquisition memory. After some searching, I think this is because my scope has the MegaZoom feature. If I understand it correctly, MegaZoom allows them to always fill memory at max possible sample rate without affecting update rates. Thus, MegaZoom equipped scopes don't have a record length selection.

Ok, very good, I didn't know that about the MegaZoom.  I assume that this means that you'd be able to make an accurate measurement (like a frequency measurement) on these two signals simultaneously, even though their frequencies differ by 10,000.  I know that some of the older scopes made the measurements on the displayed points, and not on the complete max-sample rate points, which would result in errors in the frequency measurement for the higher frequency signals when time/div was adjusted for the lower frequency signal.  Has this been addressed in the newer incarnations of MegaZoom?  What scope do you have?
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Offline ToBeFrank

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Re: Oscilloscope training class (long)
« Reply #29 on: September 12, 2011, 08:50:27 AM »
I know that some of the older scopes made the measurements on the displayed points, and not on the complete max-sample rate points, which would result in errors in the frequency measurement for the higher frequency signals when time/div was adjusted for the lower frequency signal.  Has this been addressed in the newer incarnations of MegaZoom?  What scope do you have?

That's still the same on my DSOX3000 scope. You zoom in on the higher frequency signal to make the measurements.


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