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User name paschke
Log entry time 05:10:31 on August30,2009
Entry number 287006
keyword=Fan speed scan
Fan speed scan. Raster 3.5x3.5 (7.7x6 request).
11752 increasing fan speed from 61 Hz to 65 Hz. 70 uA
11753 Run at fan speed =65 Hz. 70 uA. Beam heater overhead now below 100 W.
This is primarily a fluctuation, but I suspect that I cannot do the entire test
at 70 uA. Move to lower current, start with highest fan speed.
Run #11754 60 uA. Fan speed at 72 Hz (set as efficiency 31%)
Run #11755 60 uA. Fan speed at 68 Hz (set as efficiency 29%)
Run #11756 60 uA. Fan speed at 63 Hz (set as efficiency 26%)
It seems that changing the speed from 60Hz to around 70 Hz would cost about
150W power. For now, fan speed set to 67 Hz (28%). This can be adjusted later