on the calibrator counterclockwise until the MI displays a
negative value (example -1.0mm). Slowly turn the
micrometer head in the opposite direction while watching
the front display. Stop turning the micrometer head when
the MI display reads <+0.00>. Record the value of the
micrometer head position to the nearest 0.0000". Continue
rotating the micrometer head in the same direction until the
MI displays 25.40. Again read the micrometer head to the
nearest 0.0000".
Caution!: Once the first position is recorded, always turn
the micrometer head in the same direction (i.e. clockwise)
until the second measurement is recorded. Rotating the
micrometer head counterclockwise during a measurement
after passing through 0.00mm voids that test!
Note!: If the distance used during testing is exclusively
6.35mm, then the micrometer head may be rotated until the
MI displays 6.35mm. The difference in the micrometer
head readings should be 6.35 +/-0.03mm. If calibration is
required, then the method outlined in this procedure for
25.4mm should be followed.
3. Subtract the first micrometer head reading from the
second reading in step 2 and multiply the result by 25.4
(example 25.45). Go to Table 1 and determine if
calibration is required. The specified limits are +/-0.4%
ASTM D1238-95 and +/-0.10mm for DIN 53735. If
calibration is required, go to step 4, otherwise stop. Note!:
Repeating this measurement before proceeding with the
calibration procedure is recommended
4. If calibration is required, then the right hand cover on the
encoder housing must be removed. Remove the cover from
the Encoder Housing using a 3/32" Allen wrench.
Loosening the arm set screw shown in Figure 1 (5/64"
Allen Wrench). Be sure to loosen the proper set screw,
otherwise the entire arm will come loose from the shaft. If
the first set screw is accidentally loosened then the left
cover must also be removed and the first set screw
retightened when the arm is in the full down position when
the gear is oriented as shown in Figure 2. The second set
screw has been locked with removable Loctite
and may
be stiff. After loosening the second arm set screw,
determine how far the adjustment screw on the arm (see
Figure 1) must be turned by using Table 1 & the results
from step 3. For example if the difference in the
micrometer head readings from step 3 yielded 25.45mm,
Series 4000 Melt Indexer Operation Manual The Digital Encoder: Use and Calibration
55
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