I'd definitely expect the chassis ground to have a low impedance
connection to the negative power supply rail, and normally that would be
a DC connection. Without it the screening of internal circuitry would
be less effective.
The K2 definitely has a DC path from supply negative to the case.
I'd also expect any power supply large enough to require a ground
connection, and eventually have exposed voltage output rails, to have
ground connected to one. Without that, capacitive leakage can generate
a significant electric shock hazard, or even cause damage when the
powered equipment is being interconnected with equipment on another
power supply.
If the safety earth rises significantly above that of other conducting
items during a fault, there is a defect in earth bonding in the
installation as a whole, that needs urgent rectification.
--
David Woolley
Owner K2 06123.
On 05/09/2020 19:32, Alan - G4GNX wrote:
I don't understand why the antenna being connected provided a path to
ground for the supply.
If that really is the case, there would seem to be a fault with your
power supply. The secondary (low voltage) side of a PSU should never be
connected to ground. Both poles should always 'float'.
I'd be very surprised if Elecraft had connected the negative supply to
chassis ground inside the KX3 either.
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