WCA May 2008

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Wire & Cable ASIA – May/June 2008 40
Magnetic Analysis Corp (MAC) has introduced MultiMac™, a new
Windows-based, multi-mode eddy current tester that operates with
encircling/sector test coils (to detect short-surface defects) and/or
rotary test probes (to identify long, seam-type surface defects).
The new multi-mode capability incorporates all of the best features
of MAC’s individual encircling coil and rotary probe instruments into
one unit.
The MultiMac includes up to eight test channels, and a wide
selection of test parameters and special circuits to enhance
signal-to-noise ratio. Building on the successful Echohunter ®
software graphics, the instrument’s test screen displays a single
channel, and the multi-screen provides a simultaneous display of
1 to 8 channels. The
test screen provides all
the information needed
to set up and operate
MultiMac.
Both screens display
simultaneous polar
and linear modes and
all test parameters, in-
cluding thresholds.
Each channel on the MultiMac can be individually configured with different
frequencies and different channel modes. For example, ‘differential’ mode is
used to detect short weld-line defects, while ‘absolute’ mode is appropriate for
long, continuous surface flaws and open welds.
A choice of three thresholds per channel – All Phase, Sector, or Chord – can be
mapped to any of eight outputs, independently configurable for time or
distance delay and normal reject or latched mode.
With these features, MultiMac can be used to test a wide variety of
non-magnetic products, or inspect magnetic material by using Direct Current
saturation systems.
A special configuration of channels, based on flux leakage phenomenon,
provides detection of very small subsurface steel inclusions in copper or
aluminium rod.
Test speeds for the MultiMac can range from one fpm up to several thousand
fpm. MultiMac offers end-suppression circuitry with optional optical sensor to
prevent false signals from leading and trailing ends.
The MultiMac offers enhanced recording capability and remote access through
in-plant networks or the Internet. Featuring user-configurable reports, data
output can include customer and product information, defect location, time,
amplitude, and phase.
Reports can be stored locally on a network server or on a flash memory device
using the USB port.
Operator interface for the Windows-based system is by use of a keyboard and
mouse. The all-inclusive model, designed for demanding plant environments,
consists of a sealed, heavy-duty cabinet with a built-in 17" monitor, air
conditioner and pull-out keyboard. Other smaller models can be supplied with
pull-out keyboard, air conditioner and separate, optional monitor.
Magnetic Analysis Corp – USA Fax: +1 914 699 9837
Email: Website:
Multi-mode eddy current tester
The MultiMac from Magnetic Analysis Corp m m