Delta OHM LPPYRA-Lite, Руководство по эксплуатации, Страница: 10 / 16

LPPYRA-Lite
- 10 -
V1.2
5 MEASUREMENT
Below are the ways to calculate the global irradiance.
5.1 LPPYRA-Lite
Each pyranometer is distinguished by its own sensitivity (or calibration factor)
S
ex-
pressed in µV/(Wm
-2
) and shown in the label on the pyranometer (and in the optional
calibration report).
The irradiance
E
e
is obtained by measuring with a multimeter the difference of potential
DDP
at the ends of the sensor and applying the following formula:
E
e
= DDP / S
where:
E
e
is the irradiance expressed in W/m
2
;
DDP is the difference of potential expressed in
µ
V measured by the multimeter;
S is the sensitivity of the pyranometer expressed in µV/(Wm
-2
).
5.2 LPPYRA-LiteAC
The 4…20 mA output signal corresponds to the 0…2000 W/m
2
irradiance range.
The irradiance E
e
is obtained by measuring with a multimeter the current I
out
absorbed
by the sensor and applying the following formula:
E
e
= 125 • ( I
out
- 4 )
where:
E
e
is the irradiance expressed in W/m
2
;
I
out
is the current expressed in mA absorbed by the pyranometer.