Guideline DAkkS-DKD-R 5-7 The following section includes extracts from the guideline.Guideline DAkkS-DKD-R 5-7 Calibration of climatic chambers (...) The calibration of a climatic chamber determines any deviation between the values displayed by the chamber indicators and the climatological variables, air temperature and relative humidity, measured in those parts of the chamber volume provided for use or at individual points in the chamber volume. (...) The objectives of calibration are thus the following : Calibration of the indicators for temperature and relative humidity by comparison with values for air temperature and atmospheric humidity measured in the useful space using reference equipment (also specifying any such deviation and the necessary corrections. (...) (A) Calibration refers to the useful volume as spanned by the measuring locations in the unloaded climatic chamber. (...) (B) Calibration refers to the useful volume as spanned by the measuring locations in the unloaded climatic chamber. The climatic chamber can be loaded in line with the user's typical application or by filling at least 40 percent of the useful volume with test pieces. 7.1 Arrangement of measuring locations (...) For chamber volumes of up to 2000 liters the requirements regarding the number and spatial positioning of the measuring points are as per DIN EN 60068, 3-5; i.e. the measuring locations are the corner points and the spatial center of the cuboid spanning the useful volume. The calibration result is only valid for that volume spanned by the measuring points. (...) For the purpose of calibrating relative humidity in a climatic chamber subject to air circulation the absolute humidity and dewpoint Td or frost point Tf can be determined in the center of the useful volume and the spatial distribution of relative humidity can be calculated on the basis of the measured air temperature distribution. (...) • Guideline DAkkS-DKD-R 5-7 lays down minimum requirements for the calibration procedure and for the determination of measurement uncertainties when calibrating climatic chambers. • This guideline describes inter alia the objectives, procedures, and methods of calibration, and the uncertainty components involved. • The full text of this guideline is available as a PDF document on the home page of the Physikalisch-Technische Bundesanstalt (www.ptb.de > Metrologische-Dienstleis-tungen > DKD > Publikationen) and can be downloaded free-of-charge. Ahlborn Mess- und Regelungstechnik GmbH Eichenfeldstr. 1 l 83607 Holzkirchen l Germany Tel. +49 8024 3007 0 l FAX +49 8024 3007 10 For the relative humidity, pressure, temperature, flow velocity and for electrical quantities we are DAkkS accredited calibration laboratory

Calibration of climatic chambers Calibration of climatic chambers Calibration of relative atmospheric humidity at nine points in the climatic chamber using precision measuring instrument ALMEMO® 710 The ALMEMO measuring system, comprising precision measuring instrument ALMEMO® 710, one humidity sensor, and eight temperature sensors, can be used to acquire all relevant measurable variables prevalent in the climatic chamber. The relative atmospheric humidity at the nine points in the climatic chamber is calculated in the ALMEMO® 710 itself. Climatic chambers can thus be calibrated in full and on...