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You don't necessarily need isolated probes, you just need to have isolation between you and the test setup. Please learn from my mistakes where I have fried probes and oscilloscopes. Here are some hard learned lessons: 1. If you aren't sure that your oscilloscope inputs are isolated then assume they are not. This is the correct assumption 99.99% of the time. 2. The ground lead on that probe is there protect you 3. The ground lead on the oscilloscope is also there to protect you 4. Resist the temptation to circumvent ground with isolation transformers for the oscilloscope power or by cutting the ground path. Making a high fidelity high voltage measurement takes a bit of thought. The crudest method is to use 2 probe channels to make a crude differential probe. You connect the probe grounds together and not to the DUT. 1 probe goes to your signal and the other to your DUT ground. Then you subtract the two channels. Better yet you can get a proper differential probe ($$) or a high voltage rated oscilloscope probe meant for this type of work ($$$). I personally prefer another option, using a battery powered oscilloscope ($-$$$) instead. These can be purchased with the same type of safety ratings as a DMM which a regulator oscilloscope could never achieve. But to reiterate: the operator danger is when you are touching any part of the DUT or test setup. Avoid this when you can but setting up the measurement beforehand and then switch the DUT on safely. Cheers, Neil On Mon, Nov 15, 2021, at 9:41 PM, Bostonman wrote:
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