Re: Instrument inconsistency
Re: Instrument inconsistency
- Subject: Re: Instrument inconsistency
- From: Klaus Karcher <email@hidden>
- Date: Mon, 07 Jan 2008 14:33:26 +0100
- Organization: schrift & form GmbH
Olivier Desmaison wrote:
I measured a same black patch with a DTP20 and a DTP41, white backing both
measurements, both UV cut (yet the patch is black about L*14) and I get as
much as 2 L* difference.
That just seems huge to me. Any opinion ?
Olivier
First of all: Based on my experience I'm afraid to say that a Delta E
about 2 between different instruments is not unusual. But there might be
chances to improve the situation:
- There were two firmware updates for the DTP20 in 2005 which /might/
improve things (the release notes for the first update list several
"Scan Measurement Enhancements". See
<http://www.xrite.com/product_overview.aspx?ID=675&Action=Support>
- There are also some cleaning instructions (optics and calibration
reference) for the Instruments on the support pages.
- This is the support page for the DTP41:
<http://www.xrite.com/product_overview.aspx?ID=274&Action=Support>
<http://www.xrite.com/product_overview.aspx?ID=274&Action=Support&SupportID=3422>:
"X-Rite generally suggests an annual re-certification for its spectrally
based measurement devices. This annual visit to our certified color lab
ensures that your investment is in good working order and satisfies ISO
requirements. Service contracts are available for most of our current
instrument offerings."
Klaus
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