DeFelsko PosiTector DPM v.3.1 Full Manual - Manual (Page 8)

5
Smart Trend
Indicators
While the absence of an arrow does not necessarily signify stabil-
ity, it can be taken to mean that particular reading is undergoing lit-
tle or no change. Slow changes could therefore occur without
being noted by an indicator arrow.
Calibration
Calibration is the controlled and documented process of
measuring traceable calibration standards and verifying that the
results are within the stated accuracy of the Gage. Calibrations
are typically performed by the Gage manufacturer or by a certified
calibration laboratory in a controlled environment using a
documented process.
The PosiTector DPM is shipped with a Certificate of Calibration
showing traceability to a national standard. For organizations with
re-certification requirements, the PosiTector DPM may be
returned at regular intervals for calibration. DeFelsko
recommends that our customers establish Gage calibration
intervals based upon their own experience and work environment.
Based on our product knowledge, data and customer feedback, a
one year calibration interval from either the date of calibration,
date of purchase, or date of receipt is a typical starting point.
Written Calibration Procedures are available online at no charge
at www.defelsko.com.
Smart Trend TM Indicators - identify rising, falling or stable
readings. The Gage compares each measurement with recent
values to provide the current direction of change.
The Gage may require a period of time before the above climatic
readings stabilize. This is most noticeable when the Gage is
relocated from one extreme environment to another (i.e. from a
warm location to a cold location). A period of up to 30 minutes
should provide adequate time for stabilization.