I am just about ready to fit the nose deck on my Searey and have been checking various instruments to make sure they are all working OK. When blowing intio the pitot tubing quickly the analogue ASI works fine but my Dynon D100 registers up to approx 30kts briefly then goes to 0 while the ASI is still reading whatever value I hold it to. If I blow very slowly the ASI still works OK but the Dynon doesn't register at all. My question is should it? or does it only work properly when in flight conditions?