Checkline FH Series User Manual

Page 25

measuring mode by putting the matching precision standard with the appropriate target ball

on the sensor.

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Please note that large target balls will compress soft material more than small target balls.

Please note:

If the gauge switches off during the calibration procedure due to low battery voltage, calibration

must be repeated after installing fresh batteries.

Please note:

Each time the target ball is removed from the sensor tip in a distance of more than 30 mm, the

gauge will automatically be adjusted to the infinite range. Any possible drift influences (e. g.

through variations in temperature) will be extensively compensated. The more often the target ball

is removed form the sample, the more often compensation will take place so as to increase

measuring accuracy.

For that reason it is recommended to lift the target ball from the sensor tip at least every three

minutes. A message will appear on display accordingly to remind you to repeat infinite setting

(“Refresh infinite Value !!!).

To ensure measuring accuracy, check calibration after one hour of use of the gauge and

recalibrate if necessary.

6.2 Calibration methods

According to your setting of task, you may use different calibration methods. Measuring accuracy

depends on the selected calibration method. The following calibration methods are available:

Factory calibration.

This calibration method is suitable for quick and simple measurement and if larger

measuring errors are admissible as compared to zero calibration.

Zero only (zero point calibration).

This method is for quick calibration with a medium measuring accuracy.

Multi -point calibration (Zero + 1 to 4) Calibration standard(s).

In most cases a Two-point calibration (Zero + one standard) will be sufficiently good as

far as calibration is made in the range of thickness to be expected. Further calibration

points are recommended if measurement will be over a larger thickness range and if

accuracy requirements are high.