- 179: KRYPTONS, Site , Sun 02-Aug-1998 14:08:10 CDT, OKMN Krypton Cleaning
1400cdt Scott Cleaned the 4.5m Krypton.
- 174: KRYPTONS, Site , Thu 30-Jul-1998 12:07:16 CDT, NCAR Kryptons cleaned
Jul 30, ~12:00 CDT
NCAR 4.5m, 9m Kyptons cleaned:
9m in particular improved perhaps confirming the
suspicion about low variance.
Volts Before After
4.5m ~.14 ~.34 (no 'pre' clean printed)
9m ~.29 ~.87
- 160: KRYPTONS, Site , Fri 24-Jul-1998 17:32:45 CDT, OU krypton noise
from about 15:30 to 16:35 we tested the OU krypton through our data system.
From 15:30 to 16:05 we had the pins on the cable from OU's krypton shorted
to give zero volts (and thus zero variance) through their system. It
worked, but they report lnV, so they got NA's. Thus, from 16:05 to 16:35,
we put a battery at 1.319V on their connector instead. It gave lnV approx
6.84 (or was it 6.48?), with lnV'lnV' approx 1e-5 (pretty darn small).
Thus, I don't think that the noise we've seen in their data at night
is due to their data system.
During this entire period, we also had their krypton into our data system.
I see white noise on the power spectra from their signal, and a total
variance of 0.0469, rather than 0.0383 from our 4.5m sensor. It isn't
clear to me that the white noise is all of this difference. (We checked
that the pathlengths of our 9m - whose calibration function was being
used with their sensor - was almost exactly equal to the pathlength of
their sensor; thus this difference shouldn't be due to the cal function.)
We're back to our normal configuration now.
- 159: KRYPTONS, Site , Fri 24-Jul-1998 16:56:37 CDT, krypton pinout
A +12
B Gnd
C signal
D Sig Gnd/Shield
- 115: KRYPTONS, Site OKMN, Mon 13-Jul-1998 16:34:15 CDT, Cleaned OKMN Krypton Hygrometer
At 16:30ish we cleaned the window of the Mesonet Krypton hyrgrometer using a
cotton swab and distilled water. The window was also dried using a swab.
There was small black chips on the cleaning swab.
The previous voltage was approx. 35 mV...we will watch it to see how it varies.
- 92: KRYPTONS, Site NCAR, Tue 07-Jul-1998 10:23:07 CDT, Cleaned NCAR krypton hygrometers
Steve cleaned the NCAR krypton hygrometer windows with distilled water
around 10:15 CDT.
This changed the voltages from 0.02 to 0.15 for ch 100 and from 0.1 to 0.7
for ch 101, which isn't a huge change, but somewhat better.
- 74: KRYPTONS, Site All, Wed 01-Jul-1998 11:32:06 CDT, Krypton calibrations changed
The NCAR Kryptons have been using the scaled, full-range calibrations
and for the OKMN Krypton I used the clean, wet-range calibration.
I will change both to use the scaled, wet-range calibration.
Using Campbell calibrations dated 22-May-98, I changed the files
cal_files/kryton1101 and cal_files/krypton1133:
Changed NCAR s/n 1101 to Kw = -0.137, Intercept = 2663, X = 1.011
Changed NCAR s/n 1133 to Kw = -0.137, Intercept = 2431, X = 1.434
Using the Campbell calibration dated 8-97, I changed the file
OASIS98/okmn.q
Changed OKMN s/n 1090 to Kw = -0.142, Intercept = 2271, X = 1.012
Restarted covars
- 64: KRYPTONS, Site OKMN, Tue 30-Jun-1998 15:20:41 CDT, OKMN Krypton hygrometer
OKMN is using Krypton hygrometer s/n 1090. The most recent calibration
from Campbell is from 8/97:
Window -Kw Dry R Wet R INT PATH O2 DEN
------------------------------------------------------
SC24HR 0.144 0.148 0.142 2271 1.012 269
CLEAN 0.140 0.139 0.141 3449 1.012 269
I entered Kw, logV0, and X into okmn.q as follows:
write.nbrd <- function(x,lnV0=log(3449),Kw=-0.141,X=1.012)