[Elecraft] [OT] dumb question about oscilloscope probes

[Victor Rosenthal 4X6GP]

Thank you, that explains it (and more)!


73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
.
On 04/05/2020 20:28, demindor . wrote:
> Look at this article: "THE SECRET WORLD OF OSCILLOSCOPE PROBES" by Doug Ford.
> 
> It will explain where the extra resistance is coming from and what it
> is for (TLDNR - it's for suppressing ringing of 1:10 probe at high
> frequencies where the cable of the probe starts looking like a
> transmission line).
> 
> http://www.dfad.com.au/links/THE%20SECRET%20WORLD%20OF%20PROBES%20OCt09.pdf
> 
> On Mon, May 4, 2020 at 6:48 AM Victor Rosenthal 4X6GP
> <k2vco.vic at gmail.com> wrote:
>>
>> I like the way scope probes have a tip that hooks onto a component lead,
>> and a little alligator clip for the ground. So I thought I could use a
>> passive scope probe in the X1 position on my DVM too. I hooked one up
>> with a BNC-bannana adapter, but it turns out that there seems to be a
>> series resistance of about 250 ohms, which is inconvenient for
>> resistance measurements. I got the same result from several probes.
>>
>> My question is, what's going on here? Schematics of probes I found all
>> showed that in the X1 position they were straight through.
>> --
>> 73,
>> Victor, 4X6GP
>> Rehovot, Israel
>> Formerly K2VCO
>> CWops no. 5
>> http://www.qsl.net/k2vco/