DeFelsko PosiTector SPG v.1.1 Full Manual - Manual (Page 9)

6
Calibration
Instrument calibration is typically done by the manufacturer or
qualified lab. All probes include a Certificate of Calibration showing
traceability to a national standard. For organizations with
re-certification requirements, the PosiTector SPG 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.
Verification of Accuracy
Instrument accuracy is verified using the included metal shim and
glass zero plate.
Place the plate onto a stable, flat surface. Take several
measurements. If the average is greater than ±5 µm (0.2 mil), Zero
the Gage (pg. 8).
Next, place the metal shim over the glass plate and measure
ensuring the probe needle touches the glass plate in the area
between the shim’s “legs”. The average of several measurements
should be within the combined tolerances of both the shim and the
gage (±10%). For example, measuring a 75 µm (3 mil) shim should
result in values between 67.5 µm (2.7 mils) and 82.5 µm (3.3 mils).
If not, see Returning for Service (pg. 31).
To guard against measuring with an improperly adjusted Gage,
verify the Gage at the beginning and the end of each work shift.
During the work shift, if the Gage is dropped or suspected of giving
erroneous readings, its accuracy should be re-verified.
In the event of physical damage, wear, high usage, or after an
established calibration interval, the gage should be returned to the
manufacturer for repair or calibration.
Calibration & Verification of Accuracy Calibration & Verification of Accuracy