Oscilloscope a Few Basics

[WB8MHE]

Very Good. One of my future projects is the restoration of my one inch, 1937 RCA Model 151 Oscillograph, (oscilloscope). It did work several years ago, but had not been recapped or anything else done to it. You do a fine job with your videos, and I'm sure it is muchly appreciated by all viewers. Thabnks aggain.

Dick

[AllAmericanFiveRadio]

Thanks WB8MHE

[erguy6319]

Great video! I would like to know do I have to worry about the input signal's voltage? I am trying to pick up a hobby in electronics. Thanks.

[AllAmericanFiveRadio]

Thanks.

That depends on the oscilloscope. This scope can take voltages in the high hundreds straight into the input. With the right scope probe it could handle voltages much higher. So check the specifications of all your electronic equipment.

[bmkoenig26]

Concerning oscilloscope bandwidth for performing basic troubleshooting and repair on radios; is a 20MHz bandwidth sufficient?

[AllAmericanFiveRadio]

20MHz will cover all analog equipment up to and including color TV. 20MHz would very inadequate for the new computer and cellular equipment which runs into the many GHz.

[gmcjetpilot]

What a fantastic primer / tutorial on the use of an oscilloscope for a total novice (me) on a RF and Audio Circuit. Thanks Rick.

[AllAmericanFiveRadio]

Thanks. The basics are very very important.

[monarchham]

Great video!! What is the voltage of the AC component of the audio circuit? It's obviously much lower than 67v?

What does a SSB signal look like when displayed in the same fashion as the AM signal you demonstrated here?

WR9H/Herb

[AllAmericanFiveRadio]

Thanks. The audio is only a volt or two. SSB looks similar but no carrier. Google "SSB PEP oscilloscope".

[Hidalgo014]

Good job Mr Rick!!!

Doc

[AllAmericanFiveRadio]

THANKS!

[radiobigman47]

i have a b&k 15mhz scope i may have to get it out and play with it some thank you for the info

[AllAmericanFiveRadio]

Your welcome, and thanks.

[Lockemeister]

That was really good showing the screen and the controls like you did. Also the use of the DC/AC switch was something I needed to see. A very very good tutorial!

[AllAmericanFiveRadio]

Thanks, the basics are very important. I have my scope DC/AC switch on AC all the time, I thing DC is boring on a scope. This video is an experiment also.

[tubeie07]

Your videos are always beautifully presented with as much effort going into the information you provide as well as the actual video production values to make it even descriptive. Always a please to watch and thanks for the time you put into each presentation. cheers!

[AllAmericanFiveRadio]

Thanks. All these new video application are amazing. It is an interesting challenge to think of an idea and then figuring out how to produce it, and without masking or taking away from the subject of the video. Thanks again, and cheers!

[togst]

Great demonstration of the oscilloscope!

Is it a limit on how high voltage you can apply to the input, or is it the current that would "kill it"?

And what is the trigger part for?

[AllAmericanFiveRadio]

Sure there are always some limits. With a high voltage scope probe you can look at thousands of volts. But I use a voltmeter for that job I don't want to take a chance of damaging a scope, meters a cheap. The trigger syncs to the test signal so it does scroll, left or right.

[denshisan]

The explanation of the oscilloscope

[AllAmericanFiveRadio]

Thanks!

[Hammondlover2]

Still gotta get me one of these. I've been flying by the seat of my pants fixing radios.

[AllAmericanFiveRadio]

As BadEditPro says "It is the most accurate way to align". I got this one a few years ago at a flea market. Hope you can find one and at a good price. Thanks.

[Barnekkid]

What does it mean when as scope is rated for "100 Mhz?" I've read the technical stuff but don't quite get it. Can you give me a working explaination? Thanks.

[AllAmericanFiveRadio]

Compared to this 20Mhz the 100Mhz can capture much higher frequencies. In this case approximately five times higher. The 20Mhz has no problem capturing analog TV signals and that is what is was designed for. Thanks

[panheadrob]

thanks for the video ,Rick i had my scope on this transoceanic im working on yeasterday. the vid explains just what i was watching!! thanks!

[AllAmericanFiveRadio]

Oscopes are a great way to learn about electronic circuits of all kinds. Thanks.

[Vinylrecordsneverdie]

Nice demo!

All I need to know is how to rig one up. Looks like this can take the place of a signal tracer.

[AllAmericanFiveRadio]

Yes it replaces a signal tracer and does a better job. If you do not have an isolation transformer for the chassis under test use a 0.5mf@630WVDC cap or < between the chassis under test and the oscope. This will be AC mod only. I would try a 100k ohm resistor as the input lead. Thanks

[eufaula1]

Great video Rick!!

[AllAmericanFiveRadio]

THANKS!

[BadEditPro]

Great video! Watching this reminds me of the many times I have set AM modulation in broadcast stations using a scope hooked into the sampling loop.. It is the most accurate way to align the output of the audio processing so that you keep negative modulation right at 99 %. WPTF looks like they might be just a tad under modulated according to your readings.... :) JC

[AllAmericanFiveRadio]

Hey JC,

It is remarkable how useful oscilloscopes are. Accurate alignments, signal distortion, a tad light on modulation, signal tracing and troubleshooting are all easy to see with a Oscope. They are also a great way to learn about circuits too. Thanks.