Inductance Measurements

What is Inductance?

The property of a trace that opposes the change of current flowing through it and even a straight trace will have some inductance. 

Inductors do this by generating self-induced electromagnetic fields (EMF) within themselves as a result of their changing the magnetic field. In an electrical circuit, when the emf is induced in the same circuit in which the current is changing this effect is called Self-induction, ( L ) but it is sometimes commonly called back-EMF as its polarity is in the opposite direction to the applied voltage.

When the EMF is induced into an adjacent component situated within the same magnetic field, the emf is said to be induced by Mutual-induction, ( M ) and mutual induction is the basic operating principal of MEMS (micro-electromechanical system), used in airbag deployment, insulin pumps, and building ventilation systems. Self-inductance is a special case of mutual inductance, and because it is produced within a single isolated circuit we generally call self-inductance simply, Inductance.

The basic unit of measurement for inductance is called the Henry, ( H ) after Joseph Henry, but it also has the units of Webers per Ampere ( 1 H = 1 Wb/A ).

Coils

PCB’s can have several different types of inductance patterns; the most common patter is a coil. Coils can have different trace widths and spacing in combination with different sized inner diameters (see figure 1) to create a wide range of inductance. The coils could also be arranged in a pattern to create different types of MEMS.
The sample PCB shown in figure 3 has three coils. Figure 4 shows one coil as a generator and two sensor coils.

Why Gardien’s Solution?

Gardien has implemented a simplified, and flexible solution into our G-Serries Flying Probe machines and fixture-based machines.  Gardien designed the process for ease of use on our service floors, allowing accuracy and reduced training (virtually push-button technology).

Parameters that can be adjusted to meet the PCB build requirements:

  • Resistance within fixed tolerance
  • Inductance within fixed tolerance
  • Frequency

All information from the PCB fabrication drawing is transferred in the Tooling process via UCAMCO software to the job specific files.  The information is then output into the file that is used to perform the measurement.

Interested?

We offer our services under 2 distinct frameworks: the OnDemand Solution and the Integrate Solution.
Depending on your needs, you can either outsource specific testing requirements or we can completely run your test area or test department on your behalf. Contact us now and we’ll find the best solution for your business.

KEVIN SYVRET

FINANCE DIRECTOR, NORTH AMERICA

Mr. Syvret joined Gardien Services Canada as Financial Controller in 2001 and assumed the role of Finance Director North America in 2007. Over the past 20 years, Mr. Syvret has held senior finance and accounting roles, including with Canadian Pacific Ltd and Sprint Inc.

NIRAJ PATEL

VICE PRESIDENT, GARDIEN NORTH AMERICA

Mr. Niraj Patel joined the company on a part time basis in 1993 while attending college full time. He worked in various positions until he graduated from the Centennial College Computer Systems Technology program, whereupon he was hired full time. He progressed through several testing and CAM department positions and was appointed North American CAM Manager in 1998. After 18 years with the company, Mr. Patel was promoted to Senior Vice President of Operations, Gardien Services Canada Inc. in 2011. In January, 2015 Mr. Patel became Vice President NA of the newly combined organizational unit North America which includes the Canada and USA.

TODD KOLMODIN

VICE PRESIDENT QUALITY, NORTH AMERICA

Mr. Todd Kolmodin, a native to the Pacific Northwest was born in Seattle Washington. At a young age he moved to the Portland Oregon area. In March of 1986 he graduated from ITT Technical Institute with a degree in Electronics Engineering Technology. Todd began his tenure in the Electrical Test field that same year.  Todd spent eight years working in an independent testing facility in Wilsonville Oregon where he built skills in all aspects of Electrical Test and Quality Assurance. 

Todd then spent a short term with Yamamoto Corporation on their Engineering staff covering PCB drill, finishing and Electrical Test before joining Probe Test Fixtures in 1995. His charge was CAM and Fixuring Manager.  Todd joined the Gardien Group in September 1998 continuing the same roll and taking on the responsibilities of Quality Manager for Oregon operations. In 2008 Mr. Kolmodin was promoted to Vice President Quality USA. In this position Mr. Kolmodin oversees and maintains the Gardien ITAR registration, ISO Multi-Site registration and multiple site Lab Suitability with the Defense Logistics Agency Land and Maritime. Now also maintaining the Gardien QMS system Todd now serves as Vice President Quality North America.

Mr. Kolmodin is also a published columnist and Technical Presenter with multiple appearances at the IPC Apex Expo Conferences in both San Diego and Las Vegas. 

ROLAND VALENTINI

CHIEF OPERATING OFFICER

Mr. Valentini was appointed COO in July 2010 after successfully serving as head of North American operations since 2005.

Roland has over ten years’ experience in the PCB industry, including sales, service, and project management at Atotech GmbH, Germany mainly relating to PCB plating equipment.
He has significant sales experience from his tenure at Mack Rides GmbH and headed up worldwide installations for Lurgi Bischoff GmbH.

Mr. Valentini received a Master’s Degree in Mechanical Engineering from the University of Mannheim, Germany.

RICHARD HORSMAN

EXECUTIVE CHAIRMAN

Prior to Richard joining Gardien in September 2014, he was Chairman/CEO of tool chain vendor Atego Group Systems Limited which was sold to PTC Inc.

Prior to joining Atego, Richard held a number of Executive and Non-Executive roles including Senior Independent Non-Executive Director of Plethora Solutions, an AIM listed Pharmaceutical Company and CEO of AIM listed Cybit Holdings plc. where he grew the company from inception to revenues of over 25 million and took the company through multiple acquisitions before managing a sale of the business to Francisco Partners.

Richard previously held a number of senior roles in the Software industry.

RICK MERAW

GROUP VICE PRESIDENT QUALITY

Mr. Meraw was appointed Group Vice President of Quality in Jan 2015 after successfully  serving as Senior Vice President of USA operations since 2011.  Prior to being responsible for USA operations Mr Meraw was responsible for Canadian operations since 2001.

Rick has over twenty years’ experience with Gardien Group and has various roles including, service technician, customer liaison, Quality manager, technical support, project management, and software design/ implementation.

In June 1992 he graduated with an Electronic Engineering Technologist degree, with honors from a local community college.

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Our People

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+65 6225 2238

info.group@gardien.com

ROLAND VALENTINI

CHIEF OPERATING OFFICER

Mr. Valentini was appointed COO in July 2010 after successfully serving as head of North American operations since 2005.

Roland has over ten years’ experience in the PCB industry, including sales, service, and project management at Atotech GmbH, Germany mainly relating to PCB plating equipment.
He has significant sales experience from his tenure at Mack Rides GmbH and headed up worldwide installations for Lurgi Bischoff GmbH.

Mr. Valentini received a Master’s Degree in Mechanical Engineering from the University of Mannheim, Germany.