KERN & SOHN HMP - Manual (Page 3)

Sauter GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: [email protected] Tel: +49-[0]7433- 9933-199
Fax: +49-[0]7433-9933-149
Internet: www.sauter.eu
Instruction Manual
HMP
HMP-BA-e-1211 3
1. Release button
2. Loading tube
3. Guide tube
4. Connection cable
5. Coil unit
6. Impact body
7. Support ring
2.1.2 Different Types of Impact Devices
DC DL C D+15 E G
2.2 Main Screen
The main display screen is shown:
Hardness Scale Average Icon Memory Icon
Battery info
Measured value
Direction Material No. Impact times
Instruction for the main display screen:
Material: The present presetted material
Impact direction: The present impact direction
Hardness scale: Hardness scale of the present measured
value
Battery information: Showing the rest capacity of battery
Measured value: Display shows the single time measured
value (without showing the average icon) or the display
shows the mean value (with average icon prompting).
“HI” means: over conversion value or measurement range
“LO” means: lower than conversion value or measurement
range.
Impact times: Times that have been impacted
Average icon: It appears when the mean value of the
measured values is shown after the preset impact times
are achieved.
Memory icon: It appears when operating with the
instrument’s memory.
2.3 Keypad Description
* The key has to be pressed to store the present group
of measured value into the instrument’s memory. This
operation is only valid after the mean value has been
displayed.
* To display the single measured value, the keys and
have to be pressed.
* To switch on and off the backlight of the LCD, the key
has to be pressed.
* To set the impact direction, the key has to be
pressed.
* To change the impact times in one group, the key
has to be pressed. The impact times item will start flashing
when the key is pressed. Then the impact times value
can be adjusted as desired by the keys and .
Finally, the key has to be pressed to exit from
changing the impact times procedure.
* The hardness scale can be changed by pressing the
key.
*Material can be changed by pressing the key. After
material setting has been changed, presetting hardness
scale recovers HL automatically.
* The key has to be pressed to switch between
hardness test and strength test.
Remark: Only D and DC type of impact device have got
the function of strength testing. So, if the impact device is
not D or DC type, only hardness testing is possible.
*The key has to be pressed to print out the measured
values after the measurement has been performed.
2.4 Leeb Hardness Testing Principle
The basic principle shortly described:
An impact body with a certain weight impacts against the
testing surface under certain test force. Then the impact
velocity and the rebound velocity of the impact body are
measured respectively while the spherically test tip is
located 1 mm above the testing surface.
The calculation formula is as follows:
HL= 1000 x VB/VA
Where HL= Leeb Hardness Value
VB= Rebounding velocity of the impact body
VA= Impact velocity of the impact body
3. Preparation
3.1 HMP Preparation and Inspection
The instrument is calibrated by using the test block,
included in delivery. The error and repeatability of the
displayed value should be within the regulation of
APPENDIX Table 2.
The instrument and the impact device have to be
calibrated using a standard hardness block before the first
use. If the hardness tester has not been used for a longer
period, it is also recommended to calibrate it and as well, if
the instrument’s system has been reset.