Perhaps a silly question, but as I get the impression that both seem to have failed simultaneously with the same fault I'm just wondering if you're sure it isn't what you're checking them with that's developed a problem? Regards Nigel GM8PZR In a message dated 13/10/2012 13:52:46 GMT Daylight Time, [email protected] writes:
Hi All, both of my double oven 10811A's have been running flawlessly until now when I noticed that the output power has dropped by about 3 dB (measures only 4...4.5 dBm at 50 Ohm load), and the noise floor has gone up by about 20 dB, while the frequency is still spot on. I used them for various mesurements, so I can unfortunately not remember what might have caused the failure. Only the 12V linear lab power supply that fed the heaters had developed a completely dead filter cap, so the feeding voltage was a 100 Hz sawtooth rather than DC. The heaters appear to be still working though. I'm only using the internal heater. They draw some 700 mA at power up and drop to around 150 mA each when warm. So the oscillators are unlikely to be cooked inside. Something must have happened to the 10 MHz output, possibly an ESD issue? Before I start taking them apart, can anyone tell what has happened or what to look for first? Regards, Adrian _______________________________________________ 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. _______________________________________________ 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.
