Capacitors are for magnetic resonance imaging

13 May 2014

Voltronics, now operating under the Knowles Capacitor brange,  has been providing variable trimmer capacitors to the electronics industry.

Its non-magnetic products now include the V9000 series, claimed to be the smallest, high voltage trimmer capacitor.

The V9000 Sapphire trimmer capacitor is sub-miniature at just 0.64inch (at minimum capacitance) in length, but offers the highest working voltage rating (2 kV) for its size, claims the company - whilst delivering a capacitance range of 1 to 12pF.  Sapphire is suitable for precision trimmer capacitors as its dielectric constant is stable, measuring below 0.0003 up to 10GHz, and is chemically inert; totally moisture resistant and mechanically strong.

These trimmers have a high Q (3000min at 100MHz); DC working voltage of 2000V and DC withstand of 3000V.  They are also compatible with SAC 305 reflow processing.

The capacitors are specifcally designed for the MRI industry where its size, power, capacitance range and affordability make it the preferred choice for the next generation of coils.  Due to the severe non-magnetism requirements this industry requires we use only materials that exhibit no measurable magnetism - commercial brass and plating materials are not acceptable. Our strict traceability and testing regimes ensure this essential parameter.
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