PCE Health and Fitness PCE-950 User Manual page 10

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When the sample is magnetic, this can falsify the result.
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When the sample weighs over 5 kg, a support is needed.
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Samples made of profile material or with thin wall thicknesses and parts weighing
between 2 and 5 kg need a support of more than 5 kg which must be tightly and evenly
coupled with the sample to avoid deformations caused by the impact of the impact
device or by vibrations.
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Samples with a weight below 2 kg also have to be coupled tightly and evenly to a
support of more than 5 kg. The surface between the sample and the support should be
even and smooth. Apply an adequate but not an excessive amount of coupling agent
to these surfaces.
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The minimum weight of a sample should always be 100 g.
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The minimum thickness of the sample is 3 mm.
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The hardness penetration depth of hardened parts must be at least 0.8 mm.
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To avoid errors caused by rough surfaces, the surface should be polished and have a
roughness Ra <2 µm or Rz <l0 µm
9.2 Testing the accuracy
A standard Leeb hardness block should be used to verify the accuracy of the portable hardness
tester and the mesasurement error and repeatability should not exceed the values in the following
chart.
Type of impact
No.
device
1 D
Note: It is recommended that you take a minimum of 5 tests and obtain your average. That value
should be within the tolerance shown in the chart above. If the value exceeds this tolerance, you
must send the device to PCE Instruments for calibration.
9.3 Measurement
Press the On/Off key to turn on the device. The following will be shown on the screen:
The device will automatically enter measurement mode.
Push down the loading sheath to lock the impact body. Now place the device with the support
ring on the surface of test sample. The direction of impact should be vertical with the testing
surface. Make sure that the meter is placed firmly on the test surface and push down the release
button on the top of the device to make a measurement. Five measurements should be carried
out per measuring point of the test sample. The deviation of the mean value should not exceed
the values in the chart.
Hardness value of standard Leeb
hardnesss test block
760±30HLD
530±40HLD
PCE950
Hardness Tester
© PCE Instruments
8
Accuracy Repeatability
±6 HLD 6 HLD
±10 HLD 10 HLD