Checkline DCF-900 User Manual
Page 8
6 .0
Ca libra t ion
6.1 Introduction
The DCF-900 normally does not require calibration before use.
However, whenever the productor part material to be checked
varies greatly from the steel test plate supplied, in either thickness
or shape, it is best to check or verify calibration by using an
uncoated sample of the actual product or part with one of the cali-
bration shims supplied. Check calibration as noted in 6.2, below,
and change calibration, if necessary, following the procedure of
6.3. If a change is necessary, continue to use the bare part in lieu
of the test plate supplied when checking or changing calibration.
NOTE: Be assured that the calibration checking and hanging
procedures are very simple. They take only a few minutes to
perform and should only be considered when the product material
thickness or shape changes.
6.2 Checking Calibration
1. Turn the power on by pressing the key.
Display will show ru.n or run.
2. Holding the probe by its plastic shell, place the tip on the
uncoated metal part. Gently push the probe shell until the
V-notched sleeve contacts the bare surface. If the display
reads 0.0, proceed to step 3.
If the display reads any value other than 0.0, proceed no further
since the calibration must be changed, as noted in 6.3.
3. Next, place the plastic calibration shim on top of the bare metal
part and the probe tip on top of the shim and metal part and
measure as in 5.2.
If the displayed value matches the value indicated on the shim,
within the accuracy limits of the DCF-900 Specifications noted
in 10.0, calibration has been verified. THE GAUGE IS
NOW READY FOR USE.
If it differs from the shim value, the gauge should be
re-calibrated, as indicated in 6.3.
6.3 Changing Calibration
1. Turn the power on by pressing the key.
The screen will display ru.n or run, to indicate English (mils)
or metric (microns) measuring units, respectively. To change
units, refer to 7.0.
2. Press and hold the key until CA.L is displayed, to
start the calibration process.
Setting “Zero” Point
3. Holding the probe by its plastic shell, place the tip on the bare
metal. Gently push the shell until the V-notched sleeve contacts
the surface.
The display will read 0.0, or any other value.
4. Maintaining probe contact with one hand, press and hold
the key with the free hand until a beep sounds. This
indicates that the "zero" point is properly set and entered into the
gauge's microprocessor. Remove probe.
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