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EKO INSTRUMENTS CO., LTD. - Pyranometers MS-802/802F/402/402F/602 - Instruction Manual Ver.13

Pg. 18

1) Use the relative measurement uncertainty of the calibration factor to determine the measurement

error of each single measurement.

2) Make averages of a large number of individual measurements (for example 1-second

measurements averaged over 5 minutes).

3) Adopt reported best-practice measurement uncertainties (see for example [Diffuse IOP],

[Pyrheliometer IOP].

Traceability

Internal reference pyranometer maintained at EKO is traceable to the absolute cavity which is directly

compared against the WRR (World Radiometric Reference) Primary Standard (Absolute Cavity) managed at

PMOD (Davos, Switzerland). The logger system used for the calibration measurement is traceable to

JEMIC (Japan Electric Meters Inspection Cooperation).

Internal reference pyranometer is calibrated directly compared against the pyrheliometer, which is measured

against the EKO absolute cavity, and 2 units of internal reference pyranometers by Shading Method ([A New

Method for Calibrating Reference and Field Pyranometers (1995)] Bruce W Forgan) every one year.

EKO absolute cavity is directly traceable to WRR by comparing against WRR every 5 years.

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EKO MS-802 Specifications

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