I should have zoomed in on voltage, current and R/R0 by turning off the temperature traces in the graph, but the comment below is pretty close. Between 4PM and (almost) midnight PST,
Hot wire current varied by less than 10 milliamps (1.712 - 1.722 amps) Hot wire voltage varied by less than 20 millivolts (27.99 - 28.01 volts) R/R0 varied by less than 0.005 ohm. I am looking at 1 minute averages. This is very solid. Jeff On Wed, Dec 12, 2012 at 10:50 PM, Jeff Berkowitz <[email protected]> wrote: > I looked at the voltage, current, and R/R0 values over various periods and > they all look completely flat to me. I don't see any evidence of erratic > power supply behavior. I'm not so sure about the correlation with T_ambient > either. If you zoom to the 14:00 - 14:50 period the ambient temp drops > slightly while the P_Xs rises for many minutes. There are other periods > like this too. > > Jeff > > > > On Wed, Dec 12, 2012 at 10:00 PM, Eric Walker <[email protected]>wrote: > >> I wrote: >> >> Re almost hourly fluctuations in T_Ambient -- the HVAC system kicking in >>> periodically, maybe? >>> >> >> Also, do any of the electronics folks here know what the effect might be >> on the instrumentation providing us with a measure for P_in if the external >> power supply were erratic? >> >> Eric >> >> >
