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 Forum index » DIY Hardware and Software
Oscilloscope
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mistercooper



Joined: Jul 17, 2006
Posts: 62
Location: Seattle

PostPosted: Mon Jul 17, 2006 12:58 am    Post subject: Oscilloscope Reply with quote  Mark this post and the followings unread

Will a 10mhz oscilloscope do for sdiy work? Someone in the area is offering me one for $15.

Thanks,
Cooper
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zipzap



Joined: Nov 22, 2005
Posts: 559
Location: germany
Audio files: 24

PostPosted: Mon Jul 17, 2006 1:35 am    Post subject: Reply with quote  Mark this post and the followings unread

Good Price. If it works fine than get it! Once you get into Pentium5diy you must get a new one. Then you can still hook the x-in to the left, the y to the right of your stereo and get hypnoticed.
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mistercooper



Joined: Jul 17, 2006
Posts: 62
Location: Seattle

PostPosted: Mon Jul 17, 2006 1:47 am    Post subject: Reply with quote  Mark this post and the followings unread

Lol.

So it should be accurate enough for general sdiy circuits?
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zipzap



Joined: Nov 22, 2005
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Location: germany
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PostPosted: Mon Jul 17, 2006 3:03 am    Post subject: Reply with quote  Mark this post and the followings unread

i guess so.
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piedwagtail



Joined: Apr 15, 2006
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PostPosted: Mon Jul 17, 2006 5:40 am    Post subject: Reply with quote  Mark this post and the followings unread

1 Mhz single channel i'll do fine:Reliability,sharpness and brightness are more important.
My Kenwood is dim and blurry but it suffices.

$15 is the price of two drinks in London..........

Robert
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zipzap



Joined: Nov 22, 2005
Posts: 559
Location: germany
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PostPosted: Mon Jul 17, 2006 8:15 am    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
$15 is the price of two drinks in London..........

holy shit!
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mistercooper



Joined: Jul 17, 2006
Posts: 62
Location: Seattle

PostPosted: Tue Jul 18, 2006 6:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yay

I picked it up today and it works perfectly. Its a dual channel B+K. Now I just need to make myself a pair of BNC probes.
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zipzap



Joined: Nov 22, 2005
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PostPosted: Wed Jul 19, 2006 2:37 am    Post subject: Reply with quote  Mark this post and the followings unread

Dual channal! you´re lucky. Bout the probes, i did nothing fancy, just the bnc plug+shielded guitar cable + alligator clip. That´s certainly not accurate, but it´s ok to see if you have a triangle or not and stuff like that.
If you mant to make good probes i think it goes like this: Take a 10meg resistor for a 1:10 probe. across that put a small adjustable cab (some pf i think). Connect the whole thing to something of what you know is a perfect square and adjust the cab untill u see a perfect square.
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State Machine
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Joined: Apr 17, 2006
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PostPosted: Thu Jul 20, 2006 11:10 am    Post subject: Reply with quote  Mark this post and the followings unread

Very Happy
Quote:
Take a 10meg resistor for a 1:10 probe. across that put a small adjustable cab (some pf i think). Connect the whole thing to something of what you know is a perfect square and adjust the cab untill u see a perfect square.


Actually to get 1/10 Vin (10:1 probe) at the vertical input amplifier of the scope, a series 9 MEG resistor would be required. The scope input impedance is typically 1 Mohm so 9/10 Vin would be across the 9 Mohm resistor and 1/10 Vin across the scope input. The load, unit under test, would see ideally 10 Mohm total impedance when probed.

Very Happy Very Happy Very Happy
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zipzap



Joined: Nov 22, 2005
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Location: germany
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PostPosted: Thu Jul 20, 2006 1:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

you´re right
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mistercooper



Joined: Jul 17, 2006
Posts: 62
Location: Seattle

PostPosted: Thu Jul 20, 2006 2:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the info... would it be too much to ask for a diagram of what I should make? I bought a BNC->RCA adaptor so I can put whatever I need to at the end of some shielded cable now.
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State Machine
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PostPosted: Fri Jul 21, 2006 7:52 am    Post subject: Reply with quote  Mark this post and the followings unread

Here is a diagram of the equivalent 10X probe circuit. The equations will help you decide on circuit component values. The compensation capacitor is variable and should have the center of it's tuning range straddled in the center of the scopes time constant (C2 x R2) and have enough tuning range of 10 to 15 pF.

Hope this helps .......


probe_10x.gif
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probe_10x.gif


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mistercooper



Joined: Jul 17, 2006
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Location: Seattle

PostPosted: Fri Jul 21, 2006 11:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Thank you.
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State Machine
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PostPosted: Fri Jul 21, 2006 12:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
Thank you.


Your welcome
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