Electronics > Beginners

Why are scope probes so damn big?

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Berni:

--- Quote from: Wolfgang on November 11, 2018, 11:34:44 pm ---First, "normal" probes are made to be held by human hands and this means that they have a size where is is easy.

If you need it very small probes making reliable contacts with alligator clips and tips comes to a limit when you think of 0.2mm spaced FPGA pins or the like.

Keysight and others have made very small probes that can be soldered into a circuit to keep stray capacitances and lead inductance to a minimum  for hight frequency measurements. They cost a fortune, however, and  the soldering part needs a microscope.

What you can do is homebrew a small FET probe that can be soldered into a circuit, like here:

https://electronicprojectsforfun.wordpress.com/rf-measurement-techniques/high-frequency-probes/

--- End quote ---

That is a pretty sweet looking active probe. I do already have some Agilent 1152A probes for when i want a active one. But boy are those probes the opposite direction of this thread topic. The probes are huge and heavy with a thick stiff cable, the new ones are better in that regard.

Mechatrommer:

--- Quote from: Berni on November 13, 2018, 06:39:47 am ---But boy are those probes the opposite direction of this thread topic. The probes are huge and heavy with a thick stiff cable, the new ones are better in that regard.

--- End quote ---
look further down, i guess he's talking about the diy/specialized fet circuit that is soldered directly onto the pcb, i guess we should do the same once we passed certain threshold. there is no probe that is good for everything. and that bulky keysight probe is not meant to sit directly on the pcb, it has veriety of small tips suited for certain pcb circuit.

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