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| 40m Log |
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Message ID: 820
Entry time: Mon Aug 11 00:58:31 2008
Reply to this: 821
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| Author: |
rana |
| Type: |
Update |
| Category: |
PEM |
| Subject: |
2 years of temperature trend |
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The PSL RMTEMP alarmed again because it says the room temperature is 19.5 C. Steve said in
an earlier log entry that this is a false alarm but he didn't say why he thought so...
I say that either the calibration of the RMTEMP channel has drifted, the setpoint of the HVAC
has shifted, or there's a drift in the RMTEMP channel. I don't know what electronics exactly
are used for this channel so not sure if its susceptible to so much drift.
However, since the Dust Monitor (count_temp) shows a similar temperature decline in the
last two years I am inclined to blame the HVAC system.
The attached plot shows 2 years of hour-mean trend. |
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