User manual

168
TESTING
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Hardness Reference Blocks For All Scales
With official calibration certificates UKAS, DKD or ASTM.
CV Instruments hardness reference blocks are used for annual verification and
calibration of hardness testing machines, as well as for periodical check and
sometimes for overtaking of hardness scales on a hardness testing machine. That’s
why hardness reference blocks are a necessary help of industrial Quality
Management. Only the use of high quality, precise hardness reference blocks
calibrated to applicable standards can ensure the functionality and relative reliability
and accuracy of measurement of a hardness testing machine.
The hardness reference blocks used for indirect verification should conform largely
to the workpiece to be tested, in terms of material characteristics and hardness
range. For this reason a hardness reference block made of aluminium was
developed for the lower hardness range which can not be covered by steel, using
new materials technology methods.
When using hardness reference blocks it is irrelevant whether the value of the
nominal hardness to be delivered corresponds exactly to the actual calibration value
observed, since scale adaptation should be carried out with at least two hardness
values.
A hardness reference block shall only be used as according to the standards to that
method and test condition for which it was calibrated.
CV Instruments certified hardness reference blocks are available as follows and all
conform to the international standards as mentioned above.
Hardness reference “soft” blocks made of aluminium
These CV Instruments reference blocks are available with DKD/MPA certificate only.
For several years there has been a need for “soft” blocks.
Using new materials technology methods, it is now possible to produce blocks
made of aluminium.
They are available in lower nominal values in Rockwell, Brinell and Vickers scales.
Ask for our separate sales list.
TECHNICAL SPECIFICATION
All CV Instruments hardness reference block certificates are based on following international standards:
Brinell DIN-EN-ISO 6506-3 ASTM E 10
Vickers DIN-EN-ISO 6507-3 ASTM E 92 / E 384
Rockwell DIN-EN-ISO 6508-3 ASTM E 18
Knoop ISO 4545-3 ASTM E 384
Rockwell carbide DIN 30999 ISO 3738
Martens hardness DIN 50359 ISO DIS 14577
CV Instruments certified hardness reference blocks are available as follows and
all conform to the international standards as mentioned above.
Scale UKAS DKD DKD/MPA ASTM CV
Regular Rockwell (all scales) Yes Yes Yes Yes Yes
Superficial Rockwell (all scales) Yes Yes Yes Yes Yes
Brinell (all scales) Yes Yes Yes Yes Yes
Macro Vickers (all scales) Yes Yes Yes Yes Yes
Micro Vickers (all scales) Yes Yes Yes Yes Yes
Knoop Yes Yes Yes Yes
Martens hardness Yes Yes Yes Yes
Order your blocks based on nominal values.
Please ask for our separate product list of nominal hardness values available per hardness scale and type of certificate.
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