On Sep 28, 4:42 pm, wrote:
Hello.

I have a mechanical PZL vario that indicates -0.5 kts while sitting
still and I would like to zero it. Does anyone know the proper
adjustment procedure?
When I take the glass off I cannot see a place where I could put a
small drop of paint or wax to act as counterweight. Is there a "zero"
screw that I am missing? I haven't been too ambitious with it since it
is an extremely delicate mechanism and I don't want to mess it up. Any
help would be appreciated.

Thanks,

-Gonzo (EE)

I have a SZD-55-1 with a PZL variometer PR-03. To zero it you need to
disconnect one of the tube from the back of the instrument. I have
forgoten witch one but think it is marked with an "S". Look inside to
be sure. Anyhow inside is an adjustment screw. It takes a very small
flat blade screwdriver. Just a small tweek is all it will need. If you
turn it the wrong way the error will increase.