Proceq Equotip 550 User Manual

22 © 2016 Proceq SA
3.3.2.9 Conversion Standard
Measurements in HV and HRC are direct correlations therefore no con-
version is required. The user has the option of either ASTM E140 or ISO
18265 for conversion to any other scales.
3.3.2.10 Material Groups
Since Portable Rockwell is based on static indentation principle, the
hardness conversions are less dependent on material specific proper-
ties for the majority of times.
The user still has the possibility to apply customer conversion curves if
required, see chapter “6.4 Conversion Curve Creation”.
3.3.3 Equotip Ultrasonic Contact Impedance (UCI)
3.3.3.1 Test Principle
The UCI method uses the same pyramid-shaped diamond as a conven-
tional Vickers hardness tester. Unlike Vickers testing, no optical evalua-
tion of the indentation is required, enabling fast and portable measure-
ments. The UCI method excites a rod into an ultrasonic oscillation. The
test load is applied by a spring and typically ranges from 1 to 5 kg of force
(HV1 – HV5). As the diamond is forced into the material, the frequency of
the rod oscillation changes in response to the contact area between the
diamond and the material under test. The instrument detects the shift in
frequency, converts it to a hardness value which is immediately displayed
on the screen.
3.3.3.2 Sample Preparations
Ensure that the surface of the work piece is clean, smooth and dry. If
required, use appropriate cleaning agents for cleaning, such as acetone
or isopropanol. Do not use water or any other detergent fluids.
3.3.3.3 Standards for UCI measurements
There are two standards which describe the UCI measurements, resp.
the instrument:
DIN 50159 Hardness testing with the UCI method
ASTM A1038 Standard test method for portable hardness testing by
the Ultrasonic Contact Impedance method
For conversions from one hardness unit to another, the user can chose
between the following standards:
ASTM E140 Standard hardness conversion tables for metals rela-
tionship among Brinell, Vickers, Rockwell, Superficial,
Knoop, Scleroscope and Leeb hardness
ISO 18265 Conversion of hardness values
Table of Contents
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Proceq Equotip 550 Specifications

General

Brand	Proceq
Model	Equotip 550
Category	Test Equipment
Language	English