Hi Did the frequency shift at the same time?
If not, the first suspect would be the data collection system. Bob > On Nov 26, 2014, at 11:00 AM, Dan Kemppainen <d...@irtelemetrics.com> wrote: > > Hi All, > > I've been playing with some double oven HP10811's. I've been monitoring the > internal oven feedback vs. temperature and noticed something interesting last > night. There was a sudden step change in internal oven feedback voltage. This > is the voltage coming from the amplifier monitoring the bridge that feeds the > heater transistors. > > The step change was on the order of two or three times as large as normal > swings caused by the furnace cycling in the house. The voltage was being > monitored by a 8Ch ADC card. All of the other voltages on that card were > stable. > > The jump was very small. I don't recall exactly (Not near that unit right > now), but somewhere around a mV or less. But it was very sudden and compared > to everything else on that line, or other voltages being monitored. > > I'm wondering if there is something going on in there that may require > attention. Bad solder, cracked trace, bad component??? > > Any idea what might have caused this? > > Has anyone seen anything similar? > > Thanks, > Dan > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
