October 07, 2000

Setting up instruments for Vaira Ranch grassland study near Ione, CA

CR 10x data logger with AM25T multiplexor, hooked to md9_2 (ID 2)

cr-10

Soil Moisture , Theta Probes

sn 54/015, ch1

sn 54/016, ch2

sn 54/017, ch 3

sn 54/019, ch4

sn 54/020, ch5

red: power +, 5 to 15 v dc

blue power, -

yellow, output +

green, output -

multiplexor

am25t CLK===cr10, control port

RES===control port

RTD EX===Excitation

Analog Grnd===Grnd

HI===diff ch H (ch 6)

LO===diff ch L (ch 6)

Soil Heat Flux plates, Huseflux

hfp sn 000137: 60.0 microvolt per W m-2, ch 16

hfp sn 000141: 59.0 microvolt per W m-2, ch 17

hfp sn 000143: 58.6 micro volt per W m-2, ch 18

white +

green -

Meteorological data are being logged on CR-23x, md9_3

Net Radiometer sn 990353

calib 12.3 micro volt per W m-2

KZ pyranometer sn 996980: 5.19 microvolt per W m-2

PAR sensors

Up sn 990021: 5.12 mv/( micro mol m-2 s-1) or 195.31 umol m-2 s-1/mv

Down sn 990031: 5.08 mv ( micro mol m-1 s-1) or 196.85 umol m-2 s-1/mv

Set up wire fencing around instrument towers

Base station

Lap top

Gill Sonic

Licor LI 7500

md-9 base (255)

1. Soil environment

cr10x, md9_2

ch 1am 25 t multiplexor

ch 2 soil moisture, sn 54/015

ch 3 soil moisture, sn 54/016

ch 4 soil moisture, sn 54/017

ch 5 soil moisture, sn 54/019

ch 6 soil moisture, sn 54/020

multi-plexor

Probe 5, tca_2,tca_4,tca_8, tca_16, tca_32

Probe 6, tcb_2, tcb_4, tcb_8, tcb_16, tcb_32

Probe 7 tcc_2, tcc_4, tcc_8, tcc_16, tcc_32

ch 16, soil heat flux 137

ch 17, soil heat flux 141

ch 18, soil heat flux 143

battery voltage

The program MD9_2.exe renames CR10x.dat to GR2_yrday.10x

2. Campbell 23x

met tower, md9- 3

net radiometer, s/n sn 990353; 12.3 uv/W m-2

pyranometer, s/n sn 996980; 5.19 uv/W m-2

par up: sn 990021; 195.31 umol m-2 s-1/mv

par down: sn 990031; 196.85 umol m-2 s-1/mv

rain

wetness

Tair/RH

battery voltage

solar panel voltage

Note (sensors added Nov 5, pressure, quantum line sensor)

MD9_3.exe renames the file cr23x.dat every day to GR3_yrday.23X

/* md9_2.c

Vaira grassland field study

This is a windows version of Md9_2.c for changing the filenames of the Campbell data loggers

In this case we convert CR10x2.dat to GRy_yrday.10x

Use rename after midnight to change the filename

Copy of code:

Oct 10, 2000

Dennis Baldocchi

Ecosystem Science Division

Dept Environmental Science, Policy and Management

151 Hilgard Hall

University of California , Berkeley

Berkeley , CA 94720

baldocchi@nature.berkeley.edu

*/

#include <math.h>

#include <stdio.h>

#include <stdlib.h>

#include <io.h>

#include <dos.h>

#include <float.h>

#include <string.h>

#include <malloc.h>

#include <time.h>

#include <sys\timeb.h>

int jday,days; /* Julian day */

/*

File pointers for i/o

*/

FILE *fptr1, *fptr2;

main ()

{

int i,yr, jday,rc;

static int mon[11] = {31,28,31,30,31,30,31,31,30,31,30};

char diskr[4]; /* disk drive */

char diskd[9]; /* disk drive for dat files was [9] */

char subdir[10]; /* subdirectory for *.flx files */

char rfname[20]; /* file names fname was [16] */

char yrr[3];

char cr10[25];

struct dosdate_t today;

struct dostime_t now;

_dos_getdate(&today);

_dos_gettime(&now);

sprintf(cr10,"%s","c:\vaira\cr10x2.dat");

if (now.hour ==0 && now.minute < 30)

{

if((today.year - 1988)%4 == 0) mon[1] = 29; /* check for leap year */

jday = today.day;

jday--; /* decrement jday for yesterday */

/* for the 2000s */

yr=today.year-2000;

if (yr <10)

sprintf(yrr,"%s%d","0",yr);

if (yr >=10)

sprintf(yrr,"%d",yr);

sprintf(diskr,"%s","c:\");

sprintf(subdir,"%s","vaira\");

for (i = 0; i < (today.month-1); i++)

jday += mon[i];

sprintf(rfname,"%s%s%s%s%d%s",diskr,subdir,"gr2_",yrr,jday,".10x");

/* use rename */

rename(cr10,rfname);

}

}

On setup the radiation wires were short. Had to use hookup wire to extend them to the data logger. They are not perfectly shielded and grounded.

Figure 1 Wiring Diagram for Field experiment