On 07/09/2015 04:20 AM, C.Breukel@xxxxxxx wrote:
Or to add to my question, are people familiar with this approach (elaborate
pdf on an stable adapter option):
http://tinyurl.com/ndrvsbs
Cor
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of C.Breukel@xxxxxxx
Sent: donderdag 9 juli 2015 10:44
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: selenium meter in the sun
Tim and Richard,
What batteries do you use in your Lunar Pro's ? I still use my precious last
Mercury batteries, but what than ? I heard about Weinn cells, but they did
not seem to last long
Best,
Cor
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of `Richard Knoppow
Sent: donderdag 9 juli 2015 2:51
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: selenium meter in the sun
The Luna Pro is not a selenium meter. I've forgotten what kind
of cell it has, I think Cds. It needs a battery which no Selenium
meter does. At very low light levels the cell has very slow response
time. My Luna Pro, which I just tested, takes a good minute or more to
settle at the bottom of the high range. When given some time the low end of
the high range reads exactly the same as the high end of the low range (12).
Selenium meters that are getting aged will have an error of around a
stop or more for the same light level on the two ranges with the top of the
low range tending to read low. This also shows up when comparing the high
end of the high range against a good meter, it reads low. The meters seem to
develop about a one stop error which remains costant for a long time.
Eventually they become very insensitive all over.
BTW, I learned a trick with the Weston Master: These sometimes become
intermittent or read quite low. The cure is often to clean the internal
contacts by pushing in on the cell window and rotating back and
forth several times. Has worked for me a few times.
GE meters seem to have cell problems on all versions. Same
with the original Norwood Director. The Sekonic version seems to be better.
I don't know if Sekonic still makes replacement cells but in any case they
are the wrong size for the Norwood meter.
Try your Luna Pro again but give it a couple of minutes to settle.
On 7/8/2015 4:40 PM, Tim Daneliuk wrote:
On 07/08/2015 06:35 PM, `Richard Knoppow wrote:
The test is to measure light that falls in the overlap range on both ranges.My experience - even with really good meters like Luna Pros - is that
they do NOT match across ranges when the value is at the extreme end of the
low range.
These meters are most accurate when they are around mid-deflection of the
needle.
They are highly nonlinear at the ends.
I say this having just completed cleaning, overhauling, adjusting,
etc. a couple of Luna Pros and a Luna Six.
----------------------------------------------------------------------
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Tim Daneliuktundra@xxxxxxxxxxxxxx
PGP Key:http://www.tundraware.com/PGP/
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Richard Knoppow
dickburk@xxxxxxxxxxxxx
WB6KBL
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