| Products > Test Equipment |
| Yet another scope recommendation |
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| BenjiBango:
--- Quote from: 2N3055 on June 06, 2024, 06:46:52 am --- USB, RGMII, LVDS, CSI are fast serial interfaces. Some very fast. To really check signal integrity on those high BW scope with active probing is needed. --- End quote --- Sure thing. For that we have a big LeCroy and a Tektronix with proper probes if needed. In this matter, the scope would more used to see if there is any signal whatsoever. So, more a "voltage detector" than a "voltage meter". |
| tggzzz:
--- Quote from: BenjiBango on June 06, 2024, 05:21:39 am --- --- Quote from: Fungus on June 05, 2024, 09:20:06 pm ---nb. Probing with ordinary probes will completely dominate what you see on screen once you go over about 50MHz. --- End quote --- Noticed this lately, that's why I moved to "solder-in" probes to have at least a good connection with a short ground path. --- End quote --- Have a look at these pictures of "temporary high speed scope probe “sockets”" (scroll down to that phrase) https://entertaininghacks.wordpress.com/2020/07/22/prototyping-circuits-easy-cheap-fast-reliable-techniques/ The only type of probe it makes sense to solder to a circuit is a homebrew Z0 resistive divider, but that requires 50ohm termination at the oscilloscope. (Well I suppose soldering a piece of coax is OK for low-level audio signals) |
| BenjiBango:
--- Quote from: tggzzz on June 06, 2024, 08:17:34 am --- Have a look at these pictures of "temporary high speed scope probe “sockets”" (scroll down to that phrase) https://entertaininghacks.wordpress.com/2020/07/22/prototyping-circuits-easy-cheap-fast-reliable-techniques/ The only type of probe it makes sense to solder to a circuit is a homebrew Z0 resistive divider, but that requires 50ohm termination at the oscilloscope. (Well I suppose soldering a piece of coax is OK for low-level audio signals) --- End quote --- I think I didn't provide enough context with that. I use the "Probe-To-BNC" adapter to connect a thin coax cable (RG178 or somethig) which will then be soldered at the point of interest. Which might not be quite as good as the method in your link, but less bulky. |
| Fungus:
--- Quote from: BenjiBango on June 06, 2024, 07:13:01 am ---Sure thing. For that we have a big LeCroy and a Tektronix with proper probes if needed. In this matter, the scope would more used to see if there is any signal whatsoever. So, more a "voltage detector" than a "voltage meter". --- End quote --- You certainly don't need a 1500 Euro 'scope for that. |
| 2N3055:
I would go with 500Mhz (more like 650MHz -3dB in real life on 2ch) and 50Ω inputs for purposes stated. |
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