Hi Franklin,
Our granite surface plate is used strictly for warp & twist measurement of
pcb's (very light use).  It's on our recall list.  The calibration is rather
expensive.  I was able to move from yearly cal to 3 year cal by downgrading
the plate from "A" (inspection grade) to "B" (shop grade, I believe) which
is still well within our accuracy requirements.

Regards,
Mark Hargreaves

        -----Original Message-----
        From:   Franklin D Asbell [SMTP:[log in to unmask]]
        Sent:   Thursday, January 30, 2003 10:57 AM
        To:     [log in to unmask]
        Subject:        [TN] Calibration/Verification of granite-surface
block

        Can anyone describe to me the method of calibrating/verifying a
surface
        block???

        Also, in regards to calibration recall, would this need to be on a
recall
        list or would it be verify it once in it's lifetime, what would be a
cause
        of initial calibration being voided...

        Thanks,

        Franklin D Asbell


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