Products > Test Equipment
Scope Current Probe Deskew Fixture PCB Project
steve1515:
After some discussion with the members over on the Siglent SDS2000X Plus (https://www.eevblog.com/forum/testgear/siglent-sds2000x-plus-coming/) thread, I decided to try and make my own deskew fixture PCB with adjustable frequency and rise time. The adjustable rise time is to account for differing inductance since the current loop would be a wire added to terminal blocks and not part of the PCB. This would allow for varying numbers of turns. I've drawn up the following schematic. It works well on the bread board, but I wanted to post here for others in case they were interested. :)
Martin72:
Hi,
First question, why adjustable frequency ?
Because of the limited bandwith of some probes ?
steve1515:
--- Quote from: Martin72 on August 01, 2020, 11:57:13 pm ---Hi,
First question, why adjustable frequency ?
Because of the limited bandwith of some probes ?
--- End quote ---
Yes, that was my thinking. I wanted it to work with more probes... even cheaper ones that don't have high bandwidth.
tautech:
--- Quote from: steve1515 on August 01, 2020, 11:16:36 pm ---It works well on the bread board........
--- End quote ---
Interested to see some current probe captures with it.
BTW, your thread subject would benefit from an edit and the insertion of the word Current. ;)
steve1515:
I've updated the thread title. Thanks for the tip. 8)
I've also taken some screen shots. My probe isn't the best. It's a Fluke i80-110s set to 100mV/A. I have 1k on the gate of the MOSFET and 4 turns of wire on the current loop. If I put about 500R on the gate, there is a slight overshoot but the rise time is about 200nS. Are these on par with other deskew fixtures?
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