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Test Equipment / Re: Cheap oscilloscope for checking mains power quality? Also logging equipment.
« Last post by Phil1977 on Today at 04:18:44 pm »For finding EMI misbehaviour I can really recommend such a TinySA spectrum analyzer together with an inductivce probe.
By "scanning" your devices with the inductive probe you - contactless! - find the characterstic emission of e.g. SMPS or LED drivers. If you trace down the power supply line with the inductive probe and clearly see one of the contributors, then chances are high you have found the bad guy.
Big advantage of using an inductive probe (e.g. just a 5uH ferrite inductor soldered to a SMA-cable) is that *usually* the coupling for dangerous signal components (DC or 50Hz) is so bad that nothing happens to you or to the SA - at least as long as you slowly approach your subjects.
Probably you would even get along with the non-official TinySA-Clones for this purpose, but the "real" TinySA is so valuable and the price difference is not that much that I would principly take a real one.
By "scanning" your devices with the inductive probe you - contactless! - find the characterstic emission of e.g. SMPS or LED drivers. If you trace down the power supply line with the inductive probe and clearly see one of the contributors, then chances are high you have found the bad guy.
Big advantage of using an inductive probe (e.g. just a 5uH ferrite inductor soldered to a SMA-cable) is that *usually* the coupling for dangerous signal components (DC or 50Hz) is so bad that nothing happens to you or to the SA - at least as long as you slowly approach your subjects.
Probably you would even get along with the non-official TinySA-Clones for this purpose, but the "real" TinySA is so valuable and the price difference is not that much that I would principly take a real one.