Re: P6137 scope probe repair
Hi Jared,toggle quoted messageShow quoted text
You've interpreted those measurements the same way I would. That doesn't mean that they're right, but in the worst case you at least have a comrade in wrong. The 20pF reading you got from the probe end is probably not quite quantitatively reliable, but we'll take it as "much bigger capacitance than 3.3pF", which is all we really need. Your break is indeed at the scope end, so that's good news.
The low-frequency capacitance per length of scope cable is typically (and very roughly) around 100pF/m, so a 3.3pF reading implies that the break is somewhere within about an inch of the scope end, give or take. You should be able to fix it without having to cut off more than about that much cable, which should not materially degrade the probe's response.
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford, CA 94305-4070
On 1/16/2021 04:07, Jared Cabot via groups.io wrote:
I have a small TDR unit, but it i mainly for longer runs, I'll give it a go though. I also have a 4276A LCZ meter I can use though.