Hi Dean
That little screw is to adjust the zero. The instrument works by measuring
air flow through a small orifice to/from one chamber that is otherwise
sealed to another that is open to the atmosphere. A pressure differential is
created between the chambers as you climb or descend that causes the air to
flow until the chambers equalise. Yes, it should return to zero after a
short time with your finger on the port provided you don't vary the pinkie
pressure.
John Martindale
29 Jane Circuit
TOORMINA NSW 2452
AUSTRALIA
phone: 61 2 66584767 (H)
61 2 66869094 (W)
mobile: 0417 584767
email: johnja...@optusnet.com.au
web: www.members.optusnet.com.au/johnjanet/Martindale.htm
----- Original Message -----
From: "AVLEC" <av...@telkomsa.net>
To: "KRnet" <kr...@mylist.net>
Sent: Friday, September 15, 2006 3:19 PM
Subject: KR> VSI
> Hi Guys
> I have just taken delivery of a UMA VSI unit ....snip
