***********************************************************************
* README.TXT      INFO-FILE FOR THE LCD METEO-STATION      ************
***********************************************************************
* This file contains all relevant informations concerning             *
* the meteorological station of the LYCEE CLASSIQUE DIEKIRCH (LCD)    *
* It is also a LOG-FILE for occurring problems, changes or other      *
* important news. These informations will simply be appended to the   *
* end of this file.                                                   *
* Please mail your correspondance to:                                 *
*                francis.massen@menvax.restena.lu                     *
***********************************************************************

1. Description of the meteorological station
---------------------------------------------

Name:           Meteorological station of the LYCEE CLASSIQUE DIEKIRCH
Address:        LYCEE CLASSIQUE  L-9233 DIEKIRCH (Luxembourg, Europe)
                attn:  Prof. Francis Massen, Physics Lab.

Model:          DELTA-T Weatherstation, connected to DL2 datalogger
                from:
                DELTA-T Devices Ltd
                128 Low Road, Burwell, GB - Cambridge, CB5 OEJ

Coordinates:    49 degrees 51 min 56 sec Latitude North
                 6 degrees  9 min 35 sec Longitude East
Altitude:       218 meter above sea-level

TIME:           UTC TIME, manually synchronised on DCF77 atomic clock

2. SENSORS (in the order of appearance in the data-file):
---------------------------------------------------------
state: JULY 94
                AN1     air speed measured by cup-anemometer
                        accuracy 1%; threshhold 0.2 m/s
                RG1     rain-fall measured by tipping-bucket device
                        0.2 mm per tip; expressed in mm per hour
                TM1     Logger temperature, NTC sensor, serves as a check
                        for critical high temperatures; disregard!
                TM1     Air_Temperature, NTC sensor in louvred enclosure
                        accuracy 0.1 degrees Celsius
                %RH     Air_Humidity in louvred enclosure
                        accuracy better then 2%
                TM1     Soil_Temperature, NTC sensor insertet into
                        brick wall; actually measures temperature of
                        the wall on top at the roof; specifications
                        same as TM1 Air_Temperature
                BAR     Real local air pressure, NOT REDUCED TO SEA-LEVEL!!!
                        Add 27.3 HPa to get sea-level barometric pressure
                        SCXAN15 sensor from Sensortechnics, accuracy 1-2 HPa
                ESR     Solar radiation (irradiance) in W/m2; silicon
                        photodiode with reasonably flat spectral response
                        from 400 to 1000 nanometer. Accuracy 1-2% (estim.)
                UV_A    Ultraviolett (UV-A region) sensor covering the
                        spectrum from 320 to 400 nm. Output in W/m2.
                        Spectral response curve is bell-shaped (slightly
                        asymetric), with maximum 100% relative sensitivity
                        at 370 nm.
                        Bandwidth at -3db (70% rel.sens.) is from
                        357nm and 378nm; bandwidth at half maximum (50%)
                        is from 352 to 382nm
                        ********************************************
                        *** please read separate file UV_AB.txt ****
                        ********************************************
                UV_B    Ultraviolett (UV_B region) sensor covering the
                        spectrum from 280 to 360nm. Output in W/m2
                        Spectral response curve is bell-shaped, with
                        maximum 100% relative senssitivity at 313nm.
                        Bandwidth at -3dB (70% rel. sens.) is from
                        304 to 323nm; bandwidth at half maximum (50%)
                        is from 302 to 327nm (approx.)
                        ********************************************
                        *** please read separate file UV_AB.txt ****
                        ********************************************
                 WV2    Wind_Direction, Windvane (0 degrees means wind blows
                        from North, 90 degrees from East ...).
                        Accuracy better than 2 degrees

Sampling for most sensors :  1 per minute, average stored 1 per hour
Except:                RG1:  1 per hour
                       WV2:  1 per hour
-----------------------------------------------------------------------------

3. DATAFILE FORMAT:
-------------------
The data-files are self-explaining ASCII files, of the type
'comma and " separated columns'; they may readily be imported
into (checked!):
        EXCEL 4.0               (File Open, Text, comma separated)
        QUATTRO 5.0, Windows    (Tools, Import, comma and " separated)
                     Attention: Quattro 1.0 Windows seems to have a bug
                                and can not import these files!

Data-files usually cover a whole month, and contain 744 + 8 = 752 lines for
31-days months.

The file TEST_94.DAT is a test-file covering part of March_94

Attention: There are several ERROR-FLAGS which may appear BEFORE
           (NOT after!) the data:
           # ... over-run
           $ ... noisy
           % ... outside limits
           & ... overrange

These flags show up mostly on the ESR solar radiation sensor, which
gives a slightly negative voltage at night, instead of zero.
---------------------------------------------------------------------------

4. HISTORY LOG:
---------------
11_Mar_94; 09:00 UTC:   start of logging
18_May_94; 09:00 UTC:   installation of aluminium screen to protect
                        datalogger from direct solar radiation
15_Jun_94; 09:00 UTC:   installation of an UV_A and UV_B sensor.
                        Due to malfunction all values from 15_Jun_94 10:00
                        to 17_Jun_94 09:00 should be discarded.
                        Correct measurements start at 17_Jun_94 10:00
                        **** please read UV_AB.txt file ****
JULY_94, AUG_94, SEP_94:
                        due to a hardware problem, raingauge reports
                        0 mm rain, which was not the case.
                        The global rainfall for these months, as reported
                        by a near by weatherstation are:
                        JUL_94: total rainfall = .......
                        AUG_94: total rainfall = .......
                        SEP_94: total rainfall = .......

07_Aug_94:              The EMP of a nearby lightning stroke killed the
                        serial interface of the logger. This made
                        communication with a computer impossible, but did
                        not hamper the normal functioning of the weather-
                        station. All values of August and first part of
                        September 94 are ok (except rainfall).
                        The logger was out of action from 15_Sep_94 08:00
                        up to 14_Oct_94 15:00 (repair could not be done more
                        quickly!)
                        Normal operation resumed the 14th October 1994 at
                        17:00 UTC

5. DATA FILES:
--------------
MAR94.DAT     march 1994; from 11_MAR-94 09:00 UTC to 31_Mar_94 23:00 UTC
APR94.DAT     april 1994; max. et minim. values refer to time shown
                          in the header
MAY94.DAT     may   1994; .... idem ....
JUN94_1.DAT   june  1994; first half of month (01->15 at 08:00) prior
                          to UV sensors installation
JUN94_2.DAT   june  1994; second half of month; UV sensors installed
JUL94.DAT     july  1994;  no rainfall values
AUG94.DAT     august 1994; no rainfall values
SEP94.DAT     september 1994; only values from
                              01/09/94 00:00 to 15/09/94 07:00
                              then logger out of operation until
                              14/10/94 16:00
OCT94.DAT     october 1994; only values from 14/10/94 17:00 on
                            rainfall sensor problem corrected
NOV94.DAT     november 1994
DEC94.DAT     december 1994
1994.ZIP      all values from 11_Mar_1994 to 31_Dec_1994, together
              with README.TXT and UV_AB.TXT files
---------------------------------------------- eof -------------------------

