NicoNYC 0 #1 September 18, 2002 I have the enhanced digitude that reads altitude down to 10 ft. increments. Does anyone know why if I zero out my digitude then power it off and power it back on, it's not totally zero. It will either read 0.01 or -0.02. It never remains on 0.00, which is what I reset it at. If it reads -0.00 would you assume that the minus would indicate that it's a tenth of a digit below 0.00 or would you say that it really doesn't matter? How many hits of adrenaline can you take? Quote Share this post Link to post Share on other sites
Chief 0 #2 September 18, 2002 I have one of those enhanced units. It never really goes to zero. Best I can do is + or - 10 feet. Then when I land, it almost always says 100+ feet. It is just a tool.. I should have stuck with the tried and true 100 foot increments and not the 10 foot. My old Alt 2 still works great. Good luck, and let me know if you find a cure. Quote Share this post Link to post Share on other sites
quade 4 #3 September 18, 2002 The reason it varies a bit is because like all barometric altimeters it doesn't actually tell you the distance above ground, but rather the difference in air pressure. Over the course of time, the local barometric air pressure varies a bit and the altimeter would need to be reset. You can even see this effect in a normal analog altimeter when the pressure changes from a "high" to a "low" or vice versa. Generally speaking, the local variation from a very high "high" (very nice weather) to a very low "low" (middle of a hurricane?) would be about 1 inch of mercury which would equate to about 1000 feet total. The enhanced digitude just makes all of this more noticable.quade - The World's Most Boring Skydiver Quote Share this post Link to post Share on other sites
NicoNYC 0 #4 September 18, 2002 QuoteQuoteThe reason it varies a bit is because like all barometric altimeters it doesn't actually tell you the distance above ground, but rather the difference in air pressure. Over the course of time, the local barometric air pressure varies a bit and the altimeter would need to be reset. You can even see this effect in a normal analog altimeter when the pressure changes from a "high" to a "low" or vice versa. Generally speaking, the local variation from a very high "high" (very nice weather) to a very low "low" (middle of a hurricane?) would be about 1 inch of mercury which would equate to about 1000 feet total. The enhanced digitude just makes all of this more noticable. Ummm....yeah Thanks Quade. You just did a major swoop over my head man. Dude, you sound like you designed the damm contraption. I guess I'm just going to have to wear the digitude as a backup until I can determine how much off the readings are from one another. Thanks again Quade. How many hits of adrenaline can you take? Quote Share this post Link to post Share on other sites
NicoNYC 0 #5 September 18, 2002 QuoteQuoteI have one of those enhanced units. It never really goes to zero. Best I can do is + or - 10 feet. Then when I land, it almost always says 100+ feet. It is just a tool.. I should have stuck with the tried and true 100 foot increments and not the 10 foot. My old Alt 2 still works great. Good luck, and let me know if you find a cure. Thanks Chief. I'll try it out and I'll let you know if my readings come out the same. I'm going to strap on both my analog and digital altis. I'm going to benchmark the digital to my alti2. How many hits of adrenaline can you take? Quote Share this post Link to post Share on other sites
cobaltdan 0 #6 September 18, 2002 the readings are not necessarily off. simply that the digital is far more sensitive than an analog. as quade pointed out our altimeters are not really agl altimeters but rather atmospheric pressure sensors. over the day atmospheric pressure varies a bit and is reflected as fluctuation in your altimeter. analogs are slow with a coarse accuracy displays, therefore you do not notice fluctuations much. digitals are very sensitive with fine accuracy displays and there for you will notice the fluctuation. i have played around with making digital altimeters. i built a prototype about the size of your thumb. idea being you could stick it to your visor for a "heads up" display. works great but i made the prototype 4 digits which is too high resolution and it is annoying to watch the right hand digits count down so fast..... sincerely, dan<><>Daniel Preston <><> atairaerodynamics.com (sport) atairaerospace.com (military) Quote Share this post Link to post Share on other sites
