Case Studies

Improving Long-Term Stability of Batemika UT-ONE Thermometer Readouts

Batemika Measurement Solutions was able to improve the accuracy of its UT-ONE family of thermometer readouts by implementing a VHP101T Hermetically-Sealed Bulk Metal® Foil resistor as the internal reference resistor. Long-term drifts were improved from over 20 ppm per year to less than 5 ppm per year.

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Challenge Charcroft ─ the Reliability Challenge

Take the example of a power supply which was used to drive an on-board Train Protection and Warning System (TPWS). Although the original unit provided a good fit for the system's electrical and mechanical specifications, concerns over its operational reliability soon began to surface and a more reliable alternative was needed urgently.

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Temperature Stability and Repeatability of High-Precision Trimming Resistors

Bulk Metal® Foil high-precision trimmer resistors from Vishay Foil Resistors are evaluated with a millimeter wave variable attenuator. The resistors are used to precisely set the control voltage of the attenuator. The test is carried out at different temperatures between -25°C and +75°C. The results show the excellent temperature stability, tuning precision, and settling property of the trimmer resistors.

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Powertron High Value Precision Resistors - Powertron GST 4020

High Value Precision Resistors for Multimeter and Insulation Test Equipment Calibration Verification up to 4000V using high value, precision thick film resistance elements.

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Vishay Foil Resistors have a new case study from Poly-Grames Research Center

The latest addition explores how 1 kW 1240 Bulk Metal Foil® trimming resistors delivered excellent precision, temperature stability, and tuning repeatability when setting the control voltage of a variable attenuator at different temperatures between -25°C and +75°C.

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Vishay Foil Resistors have published a new case study from California State University, East Bay

The latest case study explores how the physics department at the university required a current sensing resistor for a low-cost, low-noise current driver for use with diode lasers, and how VPG's VHP Bulk Metal® Foil power resistor was chosen based on its tight tolerance, high power rating to 10W, low thermal EMF, and resistance to internal and external temperature drifts.

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switched-annenuator

Charcroft Electronics CAR resistors used in Switched (Stepped) Attenuator Passive Volume Control

Case Study: Recently, Nick Lucas, Managing Director at Hi-Fi Collective in the UK was asked by his Australian customer Glasshouse to design and build a high performance ladder stepped attenuator for a Hi-Fi volume control. The first decision was which resistors to use? With his many years of experience with Vishay Foil Resistors and their excellent low noise, wide dynamic range and low temperature coefficient, Nick chose to use CAR resistors from Charcroft Electronics.

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