Thanks....this sounds like a good ploy...though the "subtraction technique" has never worked well on scopes i tried it on.Two normal scope probes are all you need and if you use x10 attenuation on them the loading and effect should be insignificant and not introduce noise.
Thanks, we have a Rigol DS1054Z scope, and as i seem to remember the subtraction technique just doesnt seem to work well on these...but will give it a go.as such the subtraction method, with 100MHz probes ( ideally 250MHz probes or higher ) and scope ditto - should yield good results.
Thanks, as discussed above, the problem is how to connect them to cct, when we dont have any "HF cup-tip connectors" (and obviously we cant use the "probe hat and straggly wirey probe croc clip".The suggestion either to use to standard probes
..Thanks, so you mean like in a Full Bridge? That sounds very conscientious, many would just look at each separately, and try and "remember" the other one....and presumably they use the same gate drive transformer and cct for each, so they should be the same waveforms anyway...but i see a point...maybe they got mis-assembled and they are not actually the same.This is one of the few times a 4 channel scope is really useful - looking at 2 high side gate waveforms simultaneously and comparing.
Thanks, though we dont have 100:1 probes, and so will just turn mains down to 110VAC for the test, and use 10:1 probes.when using 2x ( ideally 100x probes ) to look at 1x high side gate,
Thanks, it was wanted to use dividers _with_ standard probes...but i still think we will make our own 10:1 probes from cheap hacked up bits of coax and 9meg res and variable cap......wont be great, but good enough.The suggestion either to use to standard probes or self-elaborated lower impedance resistive divider is well considered, I think.
Thanks, though we just need a general look at the general ringiness of the hi side gate...I hear a certain ignorance regarding oscilloscope probe technique. High impedance (e.g. standard 10:1 10 Mohm) probes are using special lossy cable rather than 50 ohm coax. Also probe compensation for 50 MHz and above is more than simple RC:RC divider because cable impedance must be considered.
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