Re: instrument calibration
Re: instrument calibration
- Subject: Re: instrument calibration
- From: email@hidden
- Date: Sun, 30 Jun 2002 11:24:34 EDT
In a message dated 6/29/02 3:17:27 PM, email@hidden writes:
>
I suddenly getting really awful profiles. Seems to be a myriad of
>
possibilities. I'm wondering, how do any of us know our measuring
>
devices remain within spec? Is there some standard against which they
>
can be checked? Is this a service provided by anyone? Blind faith?
>
I'm leery of my Spectrocam, though it's only one possibility. I hear
>
they are history.
Their current sales and service configuration is certainly problematic in the
US, but they do still exist.
Try opening the spectro window in your SpectroCam software, reading the white
tile, and saving that as the reference value. Next read several hundred
patches in strip mode, then remeasure the tile, and see if the values have
drifted. If not, read another target or two and try again. If it continues to
hold, you should be in good shape. I have had every SpectroCam I ever worked
with fail to hold a consistant white value eventually, and require repair or
replacement. That procedure currently requires a trip to Europe that takes a
few weeks, meaning that anyone having serious use for the SpectroCam needs to
own at least two of them.
I'm told I "must use my SpectroCams a lot" to have them consistantly wear the
light source out within a year. Actually I go days at a time without using
the SpectroCam at all, and build only a few profiles a day when I am working
with it. If that qualifies as higher than expected usage, then that is a
matter of concern with the device's life expectancy.
C. David Tobie
Design Cooperative
email@hidden
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