Checkline ZD2 - Manual (Page 5)

8 5
4.0 CALIBRATION NOTES
The calibration process involves hanging laboratory
weights from a fixed point, engaging the vertical
line material which holds the weights with the
tension meter 3-roller system, marking a blank dial
face where the scale pointer comes to rest for each
weight used, dividing the spaces between load
“reading” marks and finish marking and numbering
to show calibration marks and “readings” on the dial
face.
The procedure requires specialized skills
and the following material:
1. A load stand to simulate the setup shown here.
2. A set of precision laboratory weights to cover the tension range of the instrument.
3. Factory “standard” nylon monofilaments as shown in the Table on page 6.
4. A Special Calibration Fixture and Metric Wrench.
A full, detailed calibration procedure is available upon request.
determination is best made by the user’s Quality Assurance Department based on the
user’s experience. However, a quick calibration check near the anticipated process
tension levels should be done to confirm the integrity of the instrument, as follows:
1. At the beginning of each work session
2. Every time a unit is dropped
3. Whenever process readings seem to be out of tolerance for no apparent reason
The quick check can be made with a simple load stand, as shown in 4.0, using a
sample of the process material and weights that are close to the tensions encountered
in the process. Be sure to move the tension meter up and down slowly to simulate the
motion of the running process material. This will check the condition of the guide
roller ball bearings and remove any inertia effect of the movement. Readings that
change with this motion reversal may indicate the possibility of a guide roller ball
bearing problem.
In the case of wire, which might be slightly deformed by the action of the 3-roller
system during static measurement, always move to a fresh portion of the wire each
time a measurement is made. (In production, the instrument always “sees” a fresh
portion.)
W
Roller
Vertical
Material
Path