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Oscilloscopes


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11 replies to this topic

#1 worms

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Posted 05 December 2018 - 08:54 AM

Anyone know a good make of portable scopes?

#2 Braintree

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Posted 05 December 2018 - 01:40 PM

I've wanted to get one for quite some time, but they always seem to be very expensive.


Casually searching Google led me to one that was $19k+ just now  :cerious:



#3 mokz

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Posted 05 December 2018 - 02:04 PM

I've wanted to get one for quite some time, but they always seem to be very expensive.


Casually searching Google led me to one that was $19k+ just now  :cerious:

 

Well, you don't need something that goes up to the multi-gigahertz range if you're only going to be looking at audio signals. There are bunch of oscilloscopes that are well below 100USD. 

 

Check this for example for 25.50USD. Goes up to 200kHz which is well enough for any audio purpose.

 

I have no idea how good it is but for 25.50 it seems quite reasonable.



#4 Braintree

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Posted 06 December 2018 - 01:36 PM

I would prefer to have an analogue one with a larger screen so I can get a decent video of it.



#5 Marked x 0ne

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Posted 06 December 2018 - 01:54 PM

not sure if youre looking for a precise oscilloscope or just cool looking imagery- if the latter you can hack any crt or tube tv to show waveforms.  There are lots of guides online, but it takes some electronics skill (and potentially dangerous, ie know what youre doing)



#6 Braintree

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Posted 06 December 2018 - 01:58 PM

Yeah, I've looked into that. The tube inside may explode (implode) so I'd rather not go that route. I like having most of my fingers intact.



#7 mokz

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Posted 06 December 2018 - 02:18 PM

I would prefer to have an analogue one with a larger screen so I can get a decent video of it.

Modern professional oscilloscopes aren't analogue. They are basically Windows PCs in oscilloscope cases with some additional HW and SW. You might as well get a USB oscilloscope and screen cap the video..

If you really want an analogue oscilloscope you need to get a very old model.

#8 juiceciuj

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Posted 06 December 2018 - 02:29 PM

what about the warmth!?



#9 mokz

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Posted 07 December 2018 - 12:04 PM

what about the warmth!?

Unfortunately analogue warmth isn't the top priority when engineers design measurement instruments.

#10 rhmilo

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Posted 07 December 2018 - 02:17 PM

what about the warmth!?

Unfortunately analogue warmth isn't the top priority when engineers design measurement instruments.

They use thermometers for that.

#11 thawkins

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Posted 10 December 2018 - 08:04 PM

You could just bounce the digital oscilloscope stream to VHS and then record the video back to the computer.



#12 phling

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Posted 13 December 2018 - 04:19 PM

I've done one TV scope hack thing for x/y scoping. was fun but, problem: the coils in a TV set have pretty bad frequency response, also the x and y coil are not the same. the vertical coil is designed to do a 60Hz sawtooth movement basically, and the horizontal coil is designed to scan like 320 or whatever lines per 1/60th second, so the design rate would be 19200Hz or whatever... In the TV I hacked, it was not possible to draw basic lissajous shapes like a circle due to that, the one coil had massive lag / phase shift over the other and expected different amplitude as well.

 

but, it was RGB and was fun for a day.

 

/// 

 

yeh for good visuals, forget digital scopes. the cool thing with analog scopes is, there's no frame rate. the output looks very "direct", you send voltage into the tube and it reacts instantly.. digital scopes are basically weak computers with extremely ugly UI rendering ie pixel based and usually low-res, and a low refresh rate..