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10.
Troubleshooting
10.1
Incorrect Measurements / Failed Performance Check
10.1.1 Leeb
During the performance check, if the average deviates from the set point
value by more than ± 6 HL (for Leeb U ± 12 HLU):
• Check first that the test block is clean, smooth and dry. See chapter
"3.3.1.2 Sample Preparations". Replace the test block if there is insuf-
ficient space for additional tests.
• Clean the impact body, paying close attention to the indenter ball at
the bottom and to the catch pin at the top of the body. Replace the
impact body if necessary.
• Clean the impact device.
• Check the mounting and wear of the support ring. Check for deposits.
Clean or replace if necessary.
• The incorrect material group, hardness scale or a wrong setting for the
impact direction may have been selected. Refer to chapter "4. Settings".
• The selected hardness scale is not in the permissible range (no con-
version). Select another scale.
• Check if individual values are scattered very widely or are continuously
too low.
• The impact is triggered while the device is not held vertically on the
surface. This may occur especially when using impact device DL. Try
using the plexiglass sleeve DL for better alignment.
• Sample is insufficiently supported. Prepare the sample for the impact
e.g. through use of the coupling method, see chapter "3.3.1.6 Testing
Light Samples".
• If the instrument still shows excessive deviations: return the device
to an authorized Proceq Service Centre for recalibration / inspection.
40
NOTE! Do not resurface test blocks or try to refurbish impact
bodies. This will impair accuracy and may also deteriorate
functionality of the Equotip 550.
10.1.2 Portable Rockwell
During the performance check, if the average deviates from the set point
value by more than ±2 HRC:
• Confirm the foot is seated securely on the probe or the probe securely
in the clamp, respectively.
• Clean the indenter, paying close attention especially to the front part
(diamond) and to the screw thread.
• Check that the test block is clean, smooth and dry. See chapter
"3.3.2.2 Sample Preparations". Replace the test block if there is insuf-
ficient space for additional tests.
• Check the mounting and wear of the stand and clamp. Check for de-
posits. Clean or replace if necessary.
• An incorrect conversion may have been selected. See chapter"4. Set-
tings".
• The selected conversion scale is not in the permissible range ("no con-
version"). Select another hardness scale
• The test is conducted while the device is not held vertically on the sur-
face, which will generally give a warning on the guidance dialog. This
may occur especially when using tripod. Try using another foot, or take
more care to align the probe vertically to the surface.
• Test piece is insufficiently supported. Prepare the test piece for the test
e.g. through supporting it with a larger metal piece.
• Make sure the probe does not tilt / move on the surface. See chapter
"3.3.1.7 Testing Curved Surfaces".
• If the instrument still shows excessive deviations: return the device
to an authorized Proceq Service Centre for recalibration / inspection.
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