] Behalf Of [EMAIL PROTECTED]
Sent: Thursday, August 03, 2006 5:20 PM
To: Elecraft@mailman.qth.net
Subject: Re: [Elecraft] Multimeter Altitude Limits
In our high altitude ballooning program at LSU (120,000 feet) it's
necessary to be very careful about sharp edges and corners in circuits of
even modest
On Fri, 4 Aug 2006 07:58:37 -0700 Peter writes:
Hi Jim;
I understand arcing at standard Temp. and pressure. I thought that
the reduction of media would produce an increase of voltage Vs. distance
(vacuum relays and Caps.)
Air is a dielectric. While its dielectric *constant* is almost identical
Correct. Pressure and density are not the same thing. But if we are
talking about arcing, should we be more concerned with pressure altitude, or
density altitude? A higher than standard temperature can make a huge
difference in the two.
As an old pilot, I had to ask!
Dan Allen
KB4ZVM
K-2
Hi Mike,
i have taken my Fluke DMM up into the hills...
No problems.
The only altitude sensitive components might be the LCD and
some DMM's have spark gaps which might short on AC prematurely at high
elevation.
i doubt there is any problem.
i operate out of Cripple Creek frequently.
Paul w0rw
Plasma displays have a 6500' limit. LCD displays shouldn't have the same
limit, though I've seen specs on meters with LCD displays that say 6500'. So
maybe it's not the display.
Craig
NZ0R
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Michael Napier
In a message dated 8/3/06 12:28:37 PM Eastern Daylight Time,
[EMAIL PROTECTED] writes:
Any expert opinions out there concerning this issue?
(altitude)
Cooling?
73 de Jim, N2EY
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You
What's the upper voltage limit the DMM will handle?
Resistors have a voltage rating as well as resistance and wattage
(dissipation) ratings. We don't normally run into the voltage rating with
leaded parts, especially with low-voltage solid state gear, but it's a very
real concern as the voltage
In our high altitude ballooning program at LSU (120,000 feet) it's
necessary to be very careful about sharp edges and corners in circuits of
even modest voltages. Vacuum chamber testing is an essential part of the
payload development. Our student payload had a Geiger-Muller tube, and
that's a
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