KERN & SOHN HD - Manual (Page 6)

6 HD-BA-e-1421
4.7.5 To release from average measurement, just press the “N/AVE” till “N” disap-
pears.
5 Calibration Check
To check whether the tester is accurate, just insert the indenter into the hole of the
calibrated test block. Apply enough force to make firm contact between the top sur-
face of the test block and the presser foot. The reading should agree with the value
stamped on the test block. If not, just carry out Zero calibration and High end calibra-
tion.
5.1 Zero calibration
Hold the durometer vertically with the point of the indenter hanging in the air, the
reading on the display should be “0”. If not, press the “Zero key” to make the tester
display “0”.
5.2 High end calibration
Just place the indenter onto a flat glass, apply enough force to make firm contact be-
tween the glass and the presser foot. The readings on the display should be between
99.5 and 101. If not, press “CAL key” to carry out high end calibration.
6 Battery replacement
a) When the battery symbol appears on the display, it is time to replace the batteries.
b) Slide the battery cover away from the tester and remove batteries.
c) Install batteries, paying careful attention to polarity.
7 Note
Readings below 10HD for Shore D type may be inexact and should not be reported
for some materials. Measurements should be made on a Shore A type.
Readings above 90HA for Shore A should be made on a Shore D type durometer.