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The 100-Ohm Barrier
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The 100-Ohm Barrier
 
From millerdial.com

History has fixed in the minds of membrane-switch engineers the belief that 100 ohms is the maximum circuit resistance they should build into their products. The ability to achieve this low level of circuit resistance was made possible through the availability of highly conductive silver inks with volume resistivities of 0.03 ohms/square/mil or less. But these inks are expensive and add to the cost of a completed switch.

100 Ohm Barrier History has fixed in the minds of membrane-switch engineers the belief that 100 ohms is the maximum circuit resistance they should build into their products. The ability to achieve this low level of circuit resistance was made possible through the availability of highly conductive silver inks with volume resistivities of 0.03 ohms/square/mil or less. But these inks are expensive and add to the cost of a completed switch.

 


Products & Services
RTD temperature probes convert the RTD resistance measurement to a current signal, eliminating the problems inherent in RTD signal transmission via lead resistance. 
Resistance temperature detector (RTD) temperature transmitters convert RTD resistance measurements to current signals, eliminating the problems inherent in RTD signal transmission via lead resistance.
Standard keypads are standard size membrane or carbon pill keypads.
Analog resistance meters are instruments that measure electrical resistance. They display values on a dial, usually with a needle or moving pointer.
Industrial inks are liquids, powders or transfer tapes printed, sprayed, rolled or transferred onto substrates or media to create markings, patterns, print or graphics.
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Product Announcements
Advanced Input Systems - Membrane Switches
Membrane switches are a versatile, low cost and reliable technology. Combining layers of polyester (PET) and acrylic based adhesives with screen printable conductive circuits and graphic overlays,... (read more)
Sheldahl, Inc. - Accentia™ ITO
Accentia Transparent Optical Coating is a low resistance, vacuum deposited layer of Indium Tin Oxide (ITO) on optically clear film. It combines Sheldahl's world class expertise in web handling, vacuum... (read more)
Tekra Corporation - Membrane Switches
Tekra Corporation is the leading distributor for the components required to design and produce a successful membrane switch: engineered plastics, adhesives, advanced hardcoated films, conductive inks,... (read more)
Advanced Input Systems - Flat Panel Keyboards
Flat Panel Keyboards are designed to meet harsh requirements. Typical applications include: process control equipment; medical equipment; laboratory instruments; test and measurement instruments;... (read more)
STACI - Membrane Switch Panels
STACI Corporation is proud of its expertise in producing Membrane Switch Panels for customers. STACI provides outstanding service and technical support, strong reliability, and quick turnaround of... (read more)
Methode Development Company - Highly Conductive Silver Inks
Highly Conductive Silver Ink can be used on a number of substrates including Polyester, Polyimide, other plastics, coated paper and FR-4. With its relatively low cure requirements it can be cured or... (read more)
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Topics of Interest
ACROLAB RTD assemblies utilize wire wound platinum elements with a reference resistance of 100 Ohms at 0 C and a temperature coefficient of 0.00385 Ohms/Ohm/C degrees. ALL Acrolab RTD probes are of... (Read More)
Conventional Schottky detector diodes are tested and specified with 20 microamperes of DC bias. The bias current reduces the junction resistance so that most of the detected voltage appears across the... (Read More)
Although a typical DC motor presents a mostly inductive load, there is always a small amount of fixed resistance in the armature circuit. The armature, intercoil, series field, brushes, wiring between... (Read More)
The Temperature Coefficient of Copper (near room temperature) is +0.393 percent per degree C. This means if the temperature increases 1°C the resistance will increase 0.393%. You have 100 feet of... (Read More)
12.2 SERIES RESONANCE Figure 12.1 shows a series RLC circuit. A sinusoidal voltage V sends a current I through the circuit. The circuit is said to be resonant when the resultant reactance is zero,... (Read More)
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Technical Articles
The 100-Ohm Barrier - Switches
How Many Cycles Will a Membrane Switch Survive? - Switches
Membrane Switch Tactile Improvement - Switches
The Transparent Membrane Switch - Switches
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