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Oscilloscope ?
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 Posted: Mon Dec 11th, 2017 05:33 am
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Bob D
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Folks, would one of the $80-$100 picoscopes be capable of measuring the signals of the types of circuitry we use, specifically the Deltang boards?
These. scopes connect to a desktop or laptop pc, some of them even have their own screen that shows the signals.
I have used a scope (1983 was probably the last time :shocked:) but not knowing much about the amplitude and frequency of these circuits I don’t know what would work.
[url==http://DSO NANO V3 - POCKET-SIZE COLOR DIGITAL OSCILLOSCOPE]=http://DSO NANO V3 - POCKET-SIZE COLOR DIGITAL OSCILLOSCOPE[/url] Picoscope

Last edited on Mon Dec 11th, 2017 05:50 pm by Bob D



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BobD
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 Posted: Mon Dec 11th, 2017 05:40 am
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Bob D
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Sorry, haven’t figured out how to link to a site on my IPad.



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 Posted: Mon Dec 11th, 2017 06:06 am
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bobquincy
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I use a PicoScope 2204A (their entry level model) and it has worked well to display signals useful to RC control. Just don't expect it to show the 2.4 GHz carrier! ;) Here is a 776 Hz PWM signal:



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 Posted: Mon Dec 11th, 2017 05:51 pm
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Bob D
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Thanks BobQ!!!

Looks like the higher the freq range the more these things cost.



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 Posted: Mon Dec 11th, 2017 06:31 pm
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Helmut
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adafruit ( where you can find it ) says you can use it for signals up to 100kHz -which makes it unreliable when you want to judge the quality of rectangular signals in the >20kHz range. I use something a bit more substantial, but it has its price, of course. I paid 225,-€ for it. You can get, from the same firm, a 12MHz scope for ~half that price.



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 Posted: Mon Dec 11th, 2017 08:06 pm
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jtrain
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May I ask why you want to have an oscilloscope in the first place?  Most people get by without one just fine.

No offense intended, I just don't see a use for model railroaders.



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 Posted: Mon Dec 11th, 2017 08:44 pm
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bobquincy
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No offense taken, but...

Most modelers do not design/program/build autonomous trains using a microcontroller to generate and control PWM to the motor driver.  Or program a microcontroller to decode signals from a IR remote.  Or modify a RC controller to improve the performance for model train use (Helmut).  But for the few who do this sort of designing an oscilloscope is a must.
But as you note, most model railroaders don't need one.  :)



boB



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 Posted: Mon Dec 11th, 2017 08:46 pm
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Bob D
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James,
There’s some things that can’t be measured with a simple voltmeter, plus I thought the price was right!

Don’t really need one, most of our stuff either works or it doesn’t and if a component or circuitry is covered by a clear coating (forget what that’s called) you won’t be able to measure anyway.

I thought it would be a nice to have thing, especially at the price.



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 Posted: Tue Dec 12th, 2017 11:30 am
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fallen
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I bought an old school analogue scope with a CRT (think small TV screen) about 5 years ago. Good up to 20MHz and cost about £70 second hand from someone clearing old labs I think. Of course, not digital or pocket sized but it has been useful and is fun to play with ...
I got it at a ham radio rally.
Frank

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 Posted: Tue Dec 12th, 2017 01:09 pm
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DavidT
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Bob, I use the Nano v3 to test all my receivers before they go out. It is small and convenient and works for me because I know what waveforms I am expecting. But the refresh rate is very slow relative to a proper scope. So to get reliable results I have had to fiddle with sensitivity, timebase and perhaps some other settings to be a good match for what I am trying to reveal on the screen. A proper scope samples the incoming signal vastly more often. So it shows a level of detail that removes some of the need for the settings to be a good match. A proper scope would be much easier for diagnosing unknown signals. But it is a great tool for getting started. Changes to settings are not saved automatically so when you mess them up and don't remember what you changed you just have to switch off and on to get factory defaults again. Some things such as the static background waveform are irritating. So once you figure out how to switch that off you save that as your new startup default by pressing the A button for 2s and then another brief press to confirm. Regards, David.

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