[Openicc] Drop size calibration

[Hal V. Engel]

On Saturday 02 February 2008 15:15:39 Alastair M. Robinson wrote:
> Hi,
>
> Hal V. Engel wrote:
> > I also see lots of DTP41 meters on ebay for reasonable prices
> > although these seem to go for more than the hand held devices like the
> > DTP20 and you would likely want to send it back to X-Rite to be
> > recalibrated since any of these on ebay will not be new.
>
> My DTP41 came from eBay.
>
> One thing to watch out for - most instruments come with some kind of
> calibration reference card, against which they must be periodically
> calibrated.  Make sure any instrument you buy comes with the calibration
> reference! 

For hand held devices this is usually in the storage base of spot reading 
devices or in the guide that is uses for strip reading if it is a strip 
reading device.  I know that the one that comes with the DTP20 appears to be 
made of a ceramic materal and I think it is designed to last for the life of 
the device.  For the DTP41 series it should be replaced periodically since it 
is a paper target.

> The X-Rite instruments are tied to a specific reference, too 
> - the card has the instrument's serial number on.  Whether the
> instrument can be "re-certified" against a replacement reference if the
> original is lost or missing I don't know.

When you send it back for recalibarion/recertification you will get a new 
calibration card as part of that service.  This service also comes with a new 
warranty and at the end of the new warranty period you can purchase an 
extended warranty.   Also the tool crib software from X-Rite will allow you 
to marry the device to a new calibration card.  Calibration cards for the 
DTP41 series cost $50.

>
> Another point, the DTP41 is a great device for profiling, but it would
> be poor choice for the kind of tests you're doing here, because it's a
> strip-reading device which is very fussy about the size and positioning
> of patches on the sheet, and the contrast between patches.  A hand-held
> device would make more sense here, when you're making a small number of
> measurements.
>
> All the best,
> --
> Alastair M. Robinson
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