IRT Problem Noted:
Especially on 7/17 and since there have been deviations of the IRT
at this site indicated by slow drift upwards to as much as >600w/m^2
and with a sudden step-function drop down to a more typical value
of 400-450w/m^2.
7/19/04 ~21:20 Checked Wiring: seemed OK.
Checked Resistance/Voltages: seemed OK (dome/case ~3.5k, divider
at 930ohms, ~3.xxx mV on thermopile.
NOTE: in data a step function is very evident at this time
perhaps implying a campbell wiring problem?...
7/20/04 18:30 Rechecked Wiring as above: OK, and no step function.
21:50 - 22:15 Swapped Tdome/Tcase inside campbell 6L/6H
'What-the-heck' try to see what that does even though
it really appears that the wiring is consistent with available
documentation.....Upward rise of ~30w/m^2.
Conclusion wiring is ok as documented for tdome / tcase.
22:15 - 22:30 Swapped leads on thermopile (5L/H)
Interesting the values jumped up to 650....suspicious that it
sort of matches the 'upward drift' value of the problem noted
above.
Values recovered after putting back to original wiring config.
Checked NAMEISS2.CSI file: OK (did not check .dld)
serial numbers and tdome/tcase coef correct: #PYG32687
NOTE: the coef are truncated not rounded in the 5th place value
I doubt that could be an issue.
Conclusion:
IRT Wiring is OK.
Possibly thermopile or thermisters going bad. Less likely a
campbell excitation/adc.