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Case Studies
The most convincing testimony to a product’s benefits is the experience of its actual users. That’s why we’re collecting case studies from users of Vishay Foil Resistors to share with the design engineering community here on the VPG web site.
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To learn more about how Vishay Foil Resistors are successfully resolving problems for design engineers, read their stories here:
Reducing Thermal Impact in Voltage Standards
Harwell uses VFR's VSMP Z-Foil and FRSM Z1-Foil Ultra High Precision Surface Mount Chip Resistors to create a range of ovenless, economical DC Voltage Standards for use in the laboratory or by the electronics enthusiast.
Low inductive power resistors for public supply network impedance simulation
Spitzenberger & Spies uses Powertron metal foil power resistors FHR 2-80xxx to build a precise resistor bank which is necessary for flicker measurements according to IEC 61000-3-3 and IEC 61000-3-11. Because of their high power rating with low inductance, these resistors are well suited.
High performance 32 Bit ADC as an Open Source Hardware Project
For a future upgrade of the Large Hadron Collider the High Precision Measurements section of the CERN Power Converter Group have developed a metrology grade analog-to-digital converter based on easily available standard components. CERN chose to release the design details of their HPM7177 under CERN OHL v.2.0 and with 6 parts from Vishay Foil Resistors the author was able to replicate it successfully.
Improving Long-Term Stability of Batemika UT-ONE Thermometer Readouts with Hermetically-Sealed High Precision Resistors
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.
Strain Measurement Experiment: No Bias at Zero Mechanical Load
In the Strain Measurement Experiment, each lab group of undergraduates at the Mechanical and Aerospace Engineering Departmen, New Mexico State University, is required to measure strains using strain gages in a tensile coupon aluminum alloy specimen at 0, 45 and 90 degrees to the loading axis. Students built Wheatstone Bridges using inexpensive, commercially-available resistors but soon discovered that the large bias voltage at zero mechanical load on the specimen made strain measurement impossible. High precision resistors provided by Vishay Foil Resistors made the Strain Measurement Experiment a success.
High Value Precision Resistors for Multimeter and Insulation Test Equipment Calibration Verification Up to 4000V
Using high value, precision thick film resistance elements, I have succeeded to make a calibration standard level verification box for evaluation of latest produced insulation testers.
Re-designed Vacuum-Tube PreAmps Take Audio to the Next Level
JHK Audio uses industry-leading Bulk Metal® Foil technology to create even darker audio backgrounds and provide superior audio performance in high-end audio devices that are designed to satisfy the demands of the most sophisticated audiophile.
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.
High-Stability, Low-Noise Current Driver
Customized Z201 Series Bulk Metal® Foil resistors from VPG Foil Resistors are used to meet the demanding target specifications of a precision 16 A current driver - required to drive current through magnetic coils - to produce and study Bose Einstein Condensates (BECs).
High-Precision Resistance Transfer Standard
wekomm engineering pairs the Vishay Foil Resistors (VFR) VHA518-7 Bulk Metal® Foil resistor with carefully selected components to create a transfer standard product that meets metrology-grade specifications even outside a calibration laboratory.
Low-Noise Laser Current Driver
Bulk Metal� Foil resistors from Vishay Foil Resistors (VFR) are used to construct a low-cost, low-noise current source to be used with diode lasers. With a tolerance of 0.01% and a power rating of 10 W, the VHP power resistor completely addresses the strict requirements for a sense resistor in this application, including resistance to internal and external temperature drifts, a high power rating, and low thermal EMF.
Switched (Stepped) Attenuator Passive Volume Control
Hi-Fi Collective designed a switched attenuator passive volume control with unrivalled performance for its customer Glasshouse in Australia.
Secondary resistance standards in quantum resistance measurements
With their very good long-term stability and low TCR, the VHA518-11 Bulk Metal® Foil resistors proved to be high-quality secondary resistance standards in quantum Hall resistance experiments.
High-Accuracy Digital Multimeters
With their long-term stability and low TCR, thermal EMF, and noise, Vishay Foil Resistors' Bulk Metal? Foil resistors helped Transmille achieve unrivalled performance with its 8000 series digital multimeters.
Precision Current Sensing for �Current Multimeter Current Adapter
With its four-terminal Kelvin configuration, low thermal EMF, and tight tolerance, Vishay Foil Resistors' CSM2512 Bulk Metal® Foil current sensing resistor helps the µCurrent GOLD multimeter current adapter provide superb accuracy.
Precision Bulk Metal� Z-Foil Current Sense Resistors in the Analysis and Improvement of Lithium-Ion Battery Efficiency and Lifetimes
The use of Bulk Metal® Z-Foil current sense resistors has led to a dramatic reduction in noise levels and, therefore, to a dramatic increase in the accuracy of high- and ultra-high-precision chargers that are used to test and improve lithium-ion battery efficiencies and lifetimes.
High-Accuracy LHC Beam Screen Heaters for Particle Accelerators
With its long-term stability and tight tolerance, Vishay Foil Resistors' VCS332Z Bulk Metal® Z-Foil resistor helped CERN create a Large Hadron Collider (LHC) beam screen heater for its particle accelerator
Digital Multimeter (DMM) Calibration, DIY
Building a simple and useful precision multimeter calibration reference using a precision current sense resistor.
High-Stability MEMS and Quartz Accelerometers for Inertial Navigation Systems
Using Bulk Metal® Z-Foil resistors, Civitanavi, located in Italy, was able to create highly stable front-end electronic cards with a single-axis analog MEMS accelerometer or quartz accelerometer onboard for inertial measurement unit (IMU) applications.
High-Precision Programmable Resistance Decade Box for Calibration Laboratories and Industrial Applications
Using Bulk Metal® Foil resistors from Vishay Foil Resistors (VFR), MEATEST was able to create a high-accuracy programmable decade box for RTD temperature simulation and industrial testing.
Control and Data Acquisition for Cable Relaxation Testing (CREEP)
Using Bulk Metal® Z-Foil resistors and arrays from Vishay Foil Resistors (VFR), Pacam Electronica wasable to create ultra-stable measuring equipment for the acquisition of data during cable relaxation testing (CREEP).
Precision active current probe for power amplifier diagnosis
This device is designed as part of the fourth year undergraduate project under the Electrical Engineering Division. The aims of the project are to undertake a major piece of work of engineering significance and exercise real life research, design and problem solving skills.
Wheatstone-Bridge Calibration Scale Adjustments Based on Precision Resistor Shunt Measurements
The University of Miami was able to successfully calculate and then compensate for drift in a load cell by using a S102C precision resistance shunt to recalibrate the instrument.
Highly stable, low-noise current source for laser diode
The Solid State Sciences department at the Ghent University, Belgium, developed a highly stable, low-noise current source to drive a conventional laser diode.
Thermal Pressure Measurement of Fluids
Texas Tech University engineering team uses the 1285G trimmer, S102C resistor, and SR-4 strain gage to enable accurate measurement of the thermal pressure of fluids
Bulk Acoustic Wave Resonator Calibration in a Dilution Refrigerator
Australia’s ARC Centre of Excellence for Engineered Quantum Systems characterizes Bulk Acoustic Wave (BAW) resonators in a cryogenic environment
Monitoring extremely low current at power levels as low as 5 nanowatts
A meter to monitor extremely low dynamic current with a high degree of accuracy unaffected by noise,temperature variations and thermal EMF; developed by Kaunas University of Technology (KTU), Lithuania.
Measurement accuracy and stability over time and temperature
High performance instrumentation amplifier circuit with high gain accuracy over a wide temperature range (-40C to 125C) developed by Intersil Corporation based in Milpitas, CA.
Thermoresistive Characterization of Composite Materials
The Center for Composite Materials at the University of Delaware is an internationally recognized center of excellence in composite materials research, development and education.
Developing an A/D converter for high temperature applications
Texas Microelectronics Corporation, located in Houston, Texas, developed a complete 4-channel, 24-bit analog-to-digital converter in a single 40-pin package capable of continuous operation at 200°C
Upgrading High-Pass Alignment Filter for Audio Systems
Verity Audio & Engineering, based in India, upgraded its B&W 800 Series Variable High-Pass Alignment Filter using the VSH series of foil resistors for superior noise reduction.
Developing a Multi-Channel DAC for High-End Audio Applications
TOTALDAC a French audio company, built a multi-channel digital-to-analog converter (DAC) for high-end audio using 96 VSR foil resistors per channel in a 3-channel configuration. Updated content (19 April 2012)
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