Yes, i'm over my head again with pretty simple matter that i can't figure out, hopefully someone could shed some light.
situation is this, i have isolation transformer, that is grounded, i mean that it has center-grounding/tab, that is intended to be grounded, and it's grounded as intented. Now then, output voltages are alright when measured with dmm, 230v, mains. Now then, when i measure it with my DIY HV-DMM probe, which is safely insulated properly ( circuit in plastic tube, wires are silicone, banana plugs are dual-isolated) i read around 450v (450mv at dmm), so it's about twise mains voltage! but, when i measure it between hard-earth, and isolated i get mains. The guestion is, why it reads 450v when i measure it on normal isolation-output windings, as my dmm shows ok mains voltage? and here's about schematic, it's different bit, 5 x 10M and two 100k resistors in paraller, so ratio is around 1:1000. also, there are 10pf/3kv caps in paraller with 10M resistors, and 2.2nf/3kv cap in paraller with 100k's.
i would have bought this probe, but they are so expensive....of course it's not always wise to save in wrong place
thanks for help!
https://www.n2rit.com/homebrew/HVProbe/Highvoltage_Probe.jpg