www.MuellerBBM.com

MACOM II ® Active Magnetic Field Compensation System

Ensures excellent imaging for research, development, quality assurance and medical engineering – with no magnetic interference

By compensating magnetic interference, MACOM II ® enables precise imaging for research, development, quality control and medical diagnostics.

Electron microscopes, high­resolution

medical diagnostic equipment and elec­

tron beam lithography systems for scan­

ning the smallest of structures (such

as in semiconductor manufacturing

for example) require optimum environ­

mental conditions to achieve the best

possible results. Research, development,

quality control and diagnostics are the

main applications for highly­sensitive

technologies. In addition to a constant

temperature, minimum vibration and

quiet acoustic conditions, a magneti­

cally quiet environment is also crucial

for achieving optimum performance.

Magnetic interference fields of just a

few 10 nT already affect the resolu­

tion of sensitive systems, while typical

sources of interference such as trams

and trains, power cables and electrical

installations in buildings often create

magnetic interference fields of several

100 nT. Passive screening of these fields

is usually very expensive. MACOM II ®,

the active magnetic field compensation

system from Müller­BBM, creates the

optimum magnetically quiet environ­

mental conditions for your systems with

the minimum of effort.

Optimise your imaging output and ex­

ploit the performance of your systems

to the full. By enabling more reliable

and meaningful imaging – without in­

terfering magnetic fields – MACOM II ®

ensures that your investment in the

latest analytical and diagnostics techno­

logy will pay dividends more quickly.

Creating optimum conditions for your work

5

Our experience – your success

For more than 40 years Müller­BBM has

been a leading engineering company in the

field of technical acoustics and vibration

control, and for the past ten years we have

also been acting as consulting engineers for

electromagnetic compatibility. All three fields

are accredited according to DIN EN ISO/IEC

17025, and the quality management system

of Müller­BBM is also certified according to

ISO 9001. As a result of our wide­ranging

experience, we are able to provide our

customers with a comprehensive service by

performing a site analysis and/or identifying

sources of interference prior to the installa­

tion of a sensitive system. Our goal is to cre­

ate complete, fully functioning solutions that

deliver perfect results for your work.

The product we offer for magnetic field re­

duction is the state of the art MACOM II ®

magnetic field compensation system. Easy to

operate and maintenance­free, this system

automatically creates the optimum working

conditions for you.

Patented technology

All the know­how we have gathered over

decades of experience from our develop­

ment and consultancy work in the area of

magnetic fields has gone into MACOM II ®.

The result is a patented system successfully

used worldwide which helps scientists, re­

searchers and physicians analyze and docu­

ment their work better. MACOM II ® actively

helps you obtain better results.

The applications of MACOM technology are as exciting as they are wide-ranging:

Material analyses / metallurgical structural investigations

Nanoparticle research

All scanning electron microscope applications

Semiconductor technology / chip manufacture

Medical diagnostics (especially magnetic resonance tomography)

User­friendly, maintenance­free operation, perfect results – MACOM II ® is bound to convince you of its benefits.

Maintenance-free operation

MACOM II ® automatically neutralizes

interfering magnetic fields. Once it

has been set up correctly during com­

missioning, the system requires no fur­

ther maintenance. For operating the

system and monitoring its functions

MACOM II ® has a display on which all

parameters can be viewed and adjusted

if necessary. During operation the dis­

play shows either the remaining magne­

tic field in all three coordinate directions

or the coil current required to create the

opposing field. For optimum support

MACOM II ® is equipped with one serial

and one Ethernet port, allowing it to be

controlled from an external computer

over an intranet or the internet.

The system also supports optional

re mote control or monitoring by

Müller­BBM. The advantage is obvious:

perfect service anywhere in the world

– without incurring unnecessary travel

expenses.

Convincing results

Image from a scanning electron microscope before and after installing MACOM II ®. Influence of a 50 Hz interference source on imaging. Image section 20 nm.

MACOM II ® and MACOM II ® MR – The advantages at a glance

Automatic compensation of magnetic interference fields

Optimised imaging

Enhances the performance of your systems

Patented technology

Easy to operate

Remote control

No maintenance

As vector fields, magnetic fields can be

cancelled out by another field of the

same magnitude in the other direction.

MACOM II ® automates this process. In

practice the superpositioning does not

provide full cancellation, but it does

considerably reduce magnetic inter­

ference fields. The prevailing magnetic

field is measured and a corresponding

opposing field is created by means of an

arrangement of current­carrying coils.

Since magnetic fields change quickly

or slowly depending on the particu­

lar source of the interference (e.g. DC

electric trains, electrical switches or mo­

ving metallic objects such as lifts, steel

doors or motor vehicles in the vicinity),

MACOM II ® operates across a wide fre­

quency range.

The heart of the system is the patented

sensor which measures interference

fields from 0 Hz (constant field) to over

100 kHz. The sensor signal is processed

in an analogue automatic control unit

with a stable control range between

0 Hz and 50 kHz. A broadband power

amplifier generates the current for the

opposing field. The system works as a

closed control loop, with the oppo­

sing field instantaneously following the

changes in the interference field.

The coils for the opposing field are

placed at the edges of the space to be

compensated; depending on the size of

this space, a self­supporting alumi nium

construction may also be used. The sen­

sor is mounted at the point where the

maximum field reduction is to be at­

tained. If this is not feasible it can also

be placed outside this area, so to some

extent it is possible to utilize the symme­

trical properties of the coil arrangement

to freely select the point of maximum

field reduction.

RS 232 | LANSignal Processor

Multiplexer

Probe Room coil

DC-Offset

DA

Filter Pre-amplifi er Final amplifi er

MACOM II ® represents the distillation of our many years of experience in consulting and magnetic field compensation into a cleverly designed and successful patented system.

MACOM II ® – Principle

Müller­BBM – comprehensive solutions from a single sourceOur strengths: consulting, inspecting, measuring, planning

An international engineering consultancy with more than 250 em­

ployees, Müller­BBM is represented at nine locations in Germany

and has numerous project offices all over the world. As leaders in

the building, environment and technology fields, our independent

experts, planners and technical specialists have been advising custo­

mers since 1962.

As a consulting and development office, Müller­BBM has the know­

ledge and experience to create client­focused solutions, and custo­

mer satisfaction is of paramount importance to us. The success of

MACOM II ® worldwide in research, development and medical tech­

nology is one of the many fruits of our endeavours.

MACOM II ® and MACOM II ® MR – Technical data

Field reduction *) ............................ 0 – 1 kHz: > 60 dB

1 – 5 kHz: 20 – 60 dB

10 – 50 kHz: 0 – 20 dB

Noise (0 – 50 kHz) ........................... < 1 nT

Long-time stability ........................ < 1 nT

Maximum interference field **) ..... approx. 10 μT

Output current ............................... 3 x 3A

Display ............................................ Flux density or output current,

system parameters

Interfaces ....................................... RS 232, Ethernet

Power input ....................................max. 270 W

Form factor ..................................... 19" 4U rackmount case or desktop

*) The specifications relate to the location of the probe.

**) The strength of the opposing field, and consequently the maximum interference field, depends on the size of the area to be compensated. A room volume of approximately 4m x 4m x 3m is assumed here.

Müller­BBM GmbH

Robert­Koch­Straße 11

D­82152 Planegg / Munich

Germany

Phone + 49 (89) 85602­0

Fax + 49 (89) 85602­111

www.MuellerBBM.com

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