KERN & SOHN HMR - Manual (Page 4)

Sauter GmbH
Ziegelei 1
D-72336 Balingen
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Internet: www.sauter.eu
Instruction Manual
HMR
HMR-BA-e-1212 4
surface. If the sample is a big plate, long rod or
bending piece, it can be deformed and become
unstable, even though its weight and thickness
is big enough; accordingly, the test value might
not be accurate. So the sample should be
reinforced or supported at its back.

Magnetism of the sample itself should be
avoided.
4.1.2 System Setting
See 6.9 for details.
4.1.3 Presetting Testing conditions
See 6.5 for details.
4.2 Testing Program
The hardness tester has to be verificated by using the
hardness block. The error and repeatability of the
displayed value should be within the regulation of
APPENDIX Table 2.
4.2.1 Start-up
1) The plug of the impact device has to be inserted into the
socket of the impact device of the instrument.
2) The key has to be pressed to power on. Now the
instrument is in testing condition.
4.2.2 Testing
- The release button on the upside of the impact device
has to be pressed to start testing. The sample and the
impact device as well as the operator are all required to be
stable now. The action direction should pass the axis of
the impact device.
- Each measurement area of the sample usually needs 3
to 5 times of testing operations. The result data dispersion
should not be more than the mean value ± 15 HL.
- The distance between any two impact points or from the
centre of any impact point to the edge of the sample
should conform to the regulation of Table 4-1.
- If an accurate conversion from the Leeb hardness value
to another hardness value is requested, a contrastive test
is needed to get conversion relations for the special
material. An inspected qualified Leeb hardness tester and
a corresponding hardness tester have to be used to test at
the same sample respectively. For each hardness value,
each homogeneous measurement, 5 points of Leeb
hardness value are needed. They are in the surroundings
of more than three indentations which need conversion of
hardness. The Leeb hardness arithmetic average value
and the corresponding hardness average value as
correlative value respectively are used to establish an
individual hardness contrastive curve. The contrastive
curve at least should include three groups of correlative
data.
Table 4-1
4.2.3 Reading the Measured Value
4.2.4 Power Off
The key has to be pressed to power off.
5. Advice
- The impact device must be replaced during the
instrument is powered off. Otherwise the type of impact
device cannot be identified by the main body. The circuit
board of the main body may get damaged.
- If the testing times are less than the preset times value,
the current test value can not be saved. 【 AVG 】 can be
pressed to end the testing process in advance if the values
shall be saved.
- When pressing 【 AVG 】 to end testing in advance, the
【 Auto save】 , 【 Auto transfer】 settings will not work.
- Only D and DC type of impact device have got the
function of strength measurement. Using other types of
impact device, the 【 Set hardness or
бb 】 can not be
modified. The 【 Set hardness or бb 】 setting will be set
to【 Hardness 】 automatically after replacing the impact
device, whether the setting is【 Hardness 】 or not before.
- Not all materials can be converted to all hardness style
values. The hardness style is reset to HL automatically
after changing material. So, material has to be selected
first before changing the hardness style.
6. Operation in Details
6.1 Power On
The key has to be pressed to power on the instrument.
Following is shown on the screen:
The type of impact device will automatically be detected
during powering on. This information will be displayed on
the screen (Probe Type). After several seconds, the