unfortunately I found out that in general there are no isolated channels in this category. you need to look for other options.
Well, Hantek has a handheld scope type with really isolated inputs but it has only 2 input channels, not 4. It is the DSO1062S http://hantek.com/ProductDetail_111.html Note the suffix S designates the isolated input, other suffix like B (i.e. DSO1062B) is not with isolated inputs. At ebay I find it for USD 618 free shipping from China. https://www.ebay.com/itm/313619684361 Differential probes would also be an option but they are relatively also expensive. Here is a differential probe offer, 100 MHz, 1300V, with a volume price of USD 149.39 when 4 quantities are bought, so it would amount to around USD 600. If two such probes would be enough, they cost 2x USD 161. Here is the ebay offer: https://www.ebay.com/itm/133520360712 Someone built a differential probe, he published it in 3 parts, Part 1 is starting here: http://blog.weinigel.se/2016/02/26/ghz-differential-probe.html One more note: In the ELEKTOR magazine an isolated oscilloscope probe was shown in the 2014 September issue but its analog input bandwidth is 60 kHz, it might be good for you to see the low frequency waveforms? see a short info on it here: https://www.elektormagazine.com/magazine/elektor-201409/27026 I have the full description as published if you are interested. 4 such units should be built. It uses an isoPower device for input isolation, here is further info on such: https://www.analog.com/en/parametricsearch/11036#/ Gyula
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