Weather station

Acording to JGW-T1809269, calibration factor from output voltage to each unit is given with

temp = ( Vout/78/0.001-100)/0.388  [deg_c]
humd = (Vout/2)/5*100 [%]
pressure = (Vout/2)/5*300 + 800 [hPa]

Then, "_GAIN" and "_OFFSET" parameters in cds filter of each channels are calculated by above equation with count value not voltage,

Name

Value

Unit

_TEMP_OFFSET

-1.278e4

count

_HUMD_OFFSET

0.0

count

_PRES_OFFSET

4.369e4

count

_TEMP_GAIN

2.017e-2

deg_c/count

_HUMD_GAIN

6.104e-3

%/count

_PRES_GAIN

1.831e-2

hPa/count

,where ransformation coefficient from voltage to adc count is given with c2V = 2.0 * 10/2**15 [V/count], because output signal from sensor is measured with single-end not differential. These parameters are managed by SDF with observe.snap. So, plase do not change this file.

Weather station (last edited 2019-05-09 14:07:56 by tatsuki.washimi)