KERN & SOHN HD - Manual (Page 5)

HD-BA-e-1421 5
4 Measuring Procedure
4.1 The Specimen should allow measurement to be taken at least 12 mm from any
edge.
Specimen surface should be flat and parallel to allow the presser face to contact to
the specimen over an area which has a minimum radius of 6mm from the durometer
probe. The specimen may be constructed with layered pieces to achieve the neces-
sary thickness requirements, however measurements taken on these specimens may
not agree with those made on solid specimens, due to the surface faces between
layers not being in complete contact.
4.2 Press and release the “Power key” to power the tester on.
4.3 Press the “MAX” key until the mark MAX is shown on the display.
4.4 Hold the durometer vertically with the point of the indenter at least 12 mm from
any edge. Apply the presser foot to the specimen as rapidly as possible, without
shock, keeping the foot parallel to the surface of the specimen.
Apply just sufficient force to obtain firm contact between the presser foot and the
specimen.
Hold for 1 or 2 seconds, the maximum reading can be obtained automatically.
4.5 To take the next measurement, just press the “Zero key” and repeat 4.4.
On the other hand, you can press the “till the mark MAX disappears from the display.
And then repeat the step 4.3 and 4.4.
4.6 If other than a maximum reading is needed, no need to set the mark “MAX”
showing on the display. In such case, the reading on the display is an instant value.
Just hold the durometer in place without motion and obtain the reading after the re-
quired time interval (Normally less than 1 second).
4.7 How to take average value
4.7.1 To take the average value of many times of measurements, just press and re-
lease the “N/AVE key” to make the symbol “N” to be shown on the display, followed
by a digit between 1-9 with the prefix “No”.
Here the digit is the times of measurements used to calculate the average value.
Every time you press and release the “N/AVE key”, the digit will increase 1. And the
digit will become “1”again while pressing the “N/AVE key” at “9”.
4.7.2 Adjust the digit to the number needed and press “MAX key” or “Zero key” to
return to the measurement state or wait for several seconds till “0” appears on the
display.
4.7.3 Take measurements as per steps from 4.3 to 4.5. Be sure that every test
should be 6 mm apart. Every time a measurement is performed, the reading and the
times of measurements are shown on the display. When the times of measurements
are equal to the number set, the unit first displays the reading of the last, and then
displays the average value of last “N” measurements, followed by 2 beeps, with a
symbol “AVE” indicated on the display.
4.7.4 To take the next average value, just repeat 4.7.3.