It is NOT the UPS. Same problem when the 5061B is connected directly to the AC Mains.
Jeff, Next thing to try is remove one of the internal 24V battery wires of the 5061B (I assume you have NiCad battery option). The sound may be coming from the 5061B deep/float charger. But first try is the Cs-OFF switch. I've had 5061 that make a buzz when the ion pump is over-current. Don't worry; the sound is the relay which interrupts the current. Check the ion current on the meter too. The frequency of the buzz gets lower and lower (or the period between clicks gets longer and longer). After a few hours or a day, it finally goes away. /tvb _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
