Re: 577 AC collector supply not reading zero on display


If I'm not mistaken this is the looping issue due to Miller effect in the DUT (I'm assuming you actually have a DUT under measurement)? There is an anti-looping adjustment but it doesn't always cancel out in my experience; left-hand front-panel knob Looping Compensation. Might be wrong about that though.

Alternatively check out the HV supply system; it's a bit of a beast to understand what with all the reversible floating supplies and current and voltage sense networks! I spent many hours trying to fathom out a problem around the machine only to discover I had inadvertently replaced a 2-way connector the wrong way round!



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