DIY oscilloscope probe

Bricolo · 25th September 2003, 10:20 AM

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?

peranders · 25th September 2003, 10:44 AM

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)

greyhorse · 25th September 2003, 10:56 AM

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.

25th September 2003, 10:20 AM	#1
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	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?

25th September 2003, 10:44 AM	#2
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	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) __________________ /Per-Anders (my first name) or P-A as my friends call me

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25th September 2003, 10:56 AM	#3
greyhorse diyAudio Member Join Date: Feb 2002 Location: Ontario	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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