-
9
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LP UVA 02 AV
The pyranometer sensitivity is set so that according to the version:
0..1 V =
0..200 W/m
2
0..5 V =
0..200 W/m
2
0..10 V =
0..200 W/m
2
To obtain irradiance the following procedure is to be applied:
-once you know the instrument output voltage (V
out
) measured with the DMM,
following formula must be applied:
out
e
V
E
⋅
=
200
for the version 0…1 V
out
e
V
E
⋅
=
40
for the version 0…5 V
out
e
V
E
⋅
=
20
for the version 0…10 V
where;
E
e
:
Irradiance in W/m
2
,
V
out
: Output voltage (in Volt) measured by the voltmeter
Radiometers are factory calibrated one by one and they are marked by their own
calibration factor.
The calibration is carried out following procedure N° DHLF-E-59. This procedure is
used in the SIT calibration center N° 124 for the calibration of UVA radiometer.
The calibration was performed by reference to Delta Ohm srl primary standard with
monochromatic light at 365 nm obtained separating the emission line of a Xe-Hg lamp
with an inferential filter. To get best performances from your LP UVA 02 it is strongly
recommended that the calibration be checked annually.
At the moment no international agreement exist for the calibration of this kind
of radiometer, so the calibration coefficient is dependent from the calibration
procedure like reported in the following article:
“Source of Error in UV Radiation Measurements “, T. C. Larason, C. L.
Cromer on “Journal of Reaserch of the National Institute of Standards and
Technology” Vol. 106, Num. 4, 2001. (The article is free on the NIST’s WEB
site at the following address : http://www.nist.gov/jers)
