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DIN 50156
Leeb hardness testing of metallic materials. Will be re-
placed by ISO 16859.
DIN 50157
Hardness testing of metallic materials with portable
measuring instruments operating with mechanical pen-
etration depth.
DIN 50159
Hardness testing with the UCI method.
ASTM A956
Standard test method for Leeb hardness testing of steel
products.
ASTM A1038 Standard test method for portable hardness testing by
the Ultrasonic Contact Impedance method
ISO 16859
Hardness testing of metalic materials by Leeb.
Extended
Measurement uncertainty analysis is applied to under-
Uncertainty
stand the differences in test results and to determine
(Combined
sources of error. The uncertainty of an Equotip Leeb,
Uncertainty)
Equotip Portable Rockwell or Equotip UCI hardness
testing system consists of a statistical component, a
component inherent to the measurement device and a
component arising from the metrological chain between
national standard and the user device (traceability).
Although uncertainty could be a complicated topic,
Equotip 550 automatically calculates the combined un-
certainty of the system. All the required information is al-
ready available in the calibration certificates provided by
Proceq. Therefore the device only requires adding these
values in the specified fields and following the simple
steps on the display in order to complete the process.
4.3
Conversions (Hardness Conversions)
There is no direct correlation between any two hardness scales. There-
fore conversions must be determined by comparison testing for any
given alloy.
28
4.3.1
Standard Conversions
Proceq has developed correlations to convert the Leeb hardness meas-
urements to other commonly used hardness scales based on groups
of alloys that have a close relationship. The conversions for HLD and
Material Group 1 (Carbon Steels) are standardized according to ASTM
E140-12b.
4.3.2
Custom Conversion Curves
See chapter "6.4 Conversion Curve Creation".
4.3.2.1 Custom Compensation
In some cases a user must measure hardness on many samples with identi-
cal size and shape that is below the ideal limits for accuracy. Studies have
been published by ASME and Nordtest that have identified and confirmed
the validity of the strategy to apply a compensation factor to correct for the
inaccuracies induced by the non-ideal geometry. The methods outlined in
chapters "6.4 Conversion Curve Creation" can be applied to create this
compensation factor to be applied automatically to the Equotip test result.
4.4
Reporting
The content of the measurement reports can be adjusted here.
4.4.1
Images Explorer
Images, i.e. company logos can be loaded from an USB stick on the de-
vice, for use in reports. Pictures must be in the *.png or *.jpg format, ideally
come with 72dpi and a maximum resolution of 496x652 pixel.
Upload Images from an USB-stick
To do so follow the steps below.
• Create the folder "PQ-Import" in the main directory of the USB-stick
(not as a subfolder in another folder) and fill it with all the picture-files
to be uploaded to the Equotip Touchscreen
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