be carried out during two periods of at least 30 days, of which one must be in the cold season of the year at the geographical place where the mixing device is to be used.
toimuma kahe vähemalt 30päevase perioodi kestel, kusjuures üks valideerimine tehakse külmal aastaajal selles geograafilises paigas, kus segamisseadet tahetakse kasutada.