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Old 25th September 2003, 10:20 AM   #1
Bricolo is offline Bricolo  France
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Default DIY oscilloscope probe

Elso told something about a DIY probe, made of a coax cable and a 50R resistor. That could be an example of a diy probe.
But I found nothing on google about it.


Does someone have infos about this?
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Old 25th September 2003, 10:44 AM   #2
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I suggest that you get a ready made probe. Very hard to do a good probe by yourself.

But thing thing is: At the tip 9 Mohms and stray cap of 3-5 pF (or maybe added) plus 1 Mohms at the input plus cable capaciantce of 9 times more than what it is at the tip. You want voltage division of 10 at all frequencies.

:: By a cheap 10x probe for your oscilloscope, and don't forget to calibrate it (trimmer at the probe contact)
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Old 25th September 2003, 10:56 AM   #3
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Linear Technology Application Note 47 (High Speed Amplifier Techniques), has the designs of a probe you might like to look at. The design can be found here:
http://www.linear.com/pdf/an47fa.pdf on page 96. At 5.09MB, it's rather large, but well worth the wait.
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