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Topic: Using an oscilloscope (Read 1 time) previous topic - next topic

pgmartin

Dear community,
Christmas was the opportunity to give myself a present in the form of a Rigol DS1052 oscilloscope   :)
Now i'm starting to enjoy it in my Arduino proyects, and learning a little about signal processing.

Now the real question:
I've noticed that the device is picking some noise from the power lines, mainly when the fridge starts or my wife uses the hair dryer. i notice something like a flash on the screen. So I'm thinking of using a line stabilizer, like the ones you use to protect your computer around here.
Is this a good idea or will this devices get more noise into the scope?

cr0sh


Dear community,
Christmas was the opportunity to give myself a present in the form of a Rigol DS1052 oscilloscope   :)
Now i'm starting to enjoy it in my Arduino proyects, and learning a little about signal processing.

Now the real question:
I've noticed that the device is picking some noise from the power lines, mainly when the fridge starts or my wife uses the hair dryer. i notice something like a flash on the screen. So I'm thinking of using a line stabilizer, like the ones you use to protect your computer around here.
Is this a good idea or will this devices get more noise into the scope?


It might actually be better to plug it into a UPS - but it couldn't hurt to try a line conditioner/stabilizer first.

Something I do want to caution you about, though (if you are new to using an oscilloscope): Don't try to measure AC line voltage with your scope until you know -exactly- what you're doing; doing so incorrectly can end up with a dead scope at best, electrocution at worst.

A good set of tutorials on scope usage can be found here:

http://www.tek.com/learning/oscilloscope-tutorial
I will not respond to Arduino help PM's from random forum users; if you have such a question, start a new topic thread.

NiHaoMike

It's very usual for a scope to pick up EMI. To avoid that, enable the bandwidth limit if full bandwidth is not needed, minimize the loop area, and use a properly terminated coax cable instead of probes for sensitive measurements.
"Optiboot: the Tiffany Yep of Arduino bootloaders."

mmcp42

"remember to connect the grounds"
you did have the earth connection of the probe connected to your signal ground??
there are only 10 types of people
them that understands binary
and them that doesn't

pgmartin

Thanks guys.

The Bandwith limitation improved things a lot in terms of noise. Looks like I was picking a lot of noise in the FM radio band (having a military installation 100m away with a huge antenna doesn't help).

Quote
use a properly terminated coax cable instead of probes for sensitive measurements.

What is a properly terminated coax cable?

I'm avoiding meassures in the high voltage area, I love my life and scope too much to do this kinds of experiments with my knowledge level  :smiley-mr-green:

Now I'll try a line stabilizer to avoid the flicker in the oscilloscope screen that happens now and then and see what happens.




justjed

This reminded me of a couple of entertaining (to me anyway) episodes from EEVblog.
http://www.youtube.com/watch?v=sUG_sjS67K4

Link to part 2 at the end of the vid.

Oh, when it sounds as if he's saying "LC Ten", he's actually saying "LC Tank", i.e. a tank circuit. And when he speaks of a 'crow' probe, that's actually C-R-O, i.e. 'cathode-ray oscilloscope' (I know, most of you know that already).

There's part 3 as well.
http://www.youtube.com/watch?v=4pwI2NebT90
... it is poor civic hygiene to install technologies that could someday
facilitate a police state. -- Bruce Schneier

pgmartin

#6
Jan 19, 2012, 03:42 pm Last Edit: Jan 19, 2012, 04:33 pm by pgmartin Reason: 1
Interesting videos.

Searching more on the web I found that the screen flicker that bothers me is a known glitch in these Rigol scopes  :~
So, I'll have to live with it and wait for a firmware update or another kind of fix.

winner10920

If you set it up and just touch the probe you can see all the ac mains radiation your body is absorbing, kinda cool actually,
cool thing is the waveform gets affected differently for everybody and in different conditions,
creepy part is atleast for me in my house, I can actually light an led dimly by simply touching one terminal with the other to ground ,

retrolefty

You want unusual scope display? Check this out:

http://www.google.com/imgres?imgurl=http://www.southhollandtrading.com/images/ScopeClockGPSBox-6.JPG&imgrefurl=http://www.southhollandtrading.com/ScopeClockGPSBox.htm&h=1049&w=1411&sz=549&tbnid=6EIUA_I7t2u4EM:&tbnh=99&tbnw=133&prev=/search%3Fq%3Dscope%2Bclock%26tbm%3Disch%26tbo%3Du&zoom=1&q=scope+clock&docid=gclmtmESrG8rAM&hl=en&sa=X&ei=v0QaT9WAL4ebiAKAzNy_CA&sqi=2&ved=0CDsQ9QEwBA&dur=16

Lefty

Osgeld

#9
Jan 21, 2012, 07:24 am Last Edit: Jan 21, 2012, 07:30 am by Osgeld Reason: 1
meh I did (a half assed) pong on mine using a digipot and a duino

http://www.youtube.com/watch?v=lqy76Bh4CDk

now there is some good use out of quality test equipment
:P


back to the thread, I agree make sure everything is grounded properly, without it even my old 20Mhz beater picks up all sorts of fun noise
http://arduino.cc/forum/index.php?action=unread;boards=2,3,4,5,67,6,7,8,9,10,11,66,12,13,15,14,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,86,87,89,1;ALL

cr0sh

#10
Jan 21, 2012, 08:36 am Last Edit: Jan 21, 2012, 08:45 am by cr0sh Reason: 1

meh I did (a half assed) pong on mine using a digipot and a duino

now there is some good use out of quality test equipment
:P

back to the thread, I agree make sure everything is grounded properly, without it even my old 20Mhz beater picks up all sorts of fun noise


There's always Youscope:

http://www.youtube.com/watch?v=s1eNjUgaB-g

Here's another - Oscillofun (by Atom Delta):

http://www.youtube.com/watch?v=o4YyI6_y6kw

Note that the video of Oscillofun isn't being shown on an actual scope, but if you download the flac of the song (view on youtube, and there should be a link to download it), then play it, feeding the left/right channels into the x/y of the scope, you'll get the display shown (or at least, that's what it says - there are youtube videos of people who have done that, too).

:D
I will not respond to Arduino help PM's from random forum users; if you have such a question, start a new topic thread.

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