Checking the signal quality
Snow depth sensor SHM 31, V2.1 59
12. Checking the signal quality
(Instructions for using the target plate set 8365.KWK-SET)
T
he sensor’s signal quality can be checked at the measuring location with the help of the target
plate set. The set consists of the following DIN A4-sized, high-quality plastic plates:
• White card 8365.KWK-WS in protective cover, approx. 85% reflectance
• Black card 8365.KWK-SW in protective cover, approx. 6% reflectance
The card can be cleaned with water and some washing-up liquid. Please do not use any harsh
cleaning products or solvents.
Remove residual moisture or residues of cleaning products with a lint-free cotton cloth.
12.1. Application
The target plates enable users of snow depth sensors to check the respective sensors’ signal
intensity. Here, the signal intensity can be tested with the distance as a function of the target
plates and different reflectivities. The curves in Figure 30 show the different signal intensities
determined with different target plates, including the white card 8365.KWK-WS and the black
card 8365.KWK-SW.
The reflectivity of the white and black target plates corresponds to the light and dark targets that
are stored in the sensor for five different distances during factory normalisation.
Figure 30: Variation of the signal intensity using different target plates. BP: Base plate, TP: Target plate
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