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New Vishay Foil Resistors Video Demonstrates the Accuracy Provided by FRSM Z1-Foil Chip Resistors for Intersil’s ISL28617



  New Vishay Foil Resistors Video Demonstrates the Accuracy Provided by FRSM
  Z1-Foil Chip Resistors for Intersil’s ISL28617 Precision Instrumentation
  Amplifier

Business Wire

MALVERN, Pa. -- March 7, 2013

Vishay Precision Group, Inc. (NYSE: VPG) today announced that its Vishay Foil
Resistors brand (VFR) has released a new video that compares the accuracy of
precision thin film resistors with the new generation of VFR COTS (commercial
off-the-shelf) resistors based on Z1-Foil technology. Using the example of a
circuit built around Intersil’s ISL28617 precision instrumentation amplifier,
the short video shows how an increase in ambient temperature causes a TCR
mismatch in the thin film resistors (TCR of 5 ppm/°C), resulting in an error
in the output of the amplifier circuit while having no effect on the Bulk
Metal Foil resistor.

Link to video: http://www.vishaypg.com/foil-resistors/videos/?video=36

Using a precision weigh scale constructed with a Tedea-Huntleigh load cell and
Micro-Measurements strain gages — both VPG products — and Intersil’s ISL28617
instrumentation amplifier, the video released today highlights the accuracy
and stability of VFR’s FRSM Z1-Foil chip resistors under increasing ambient
temperatures. In the demonstration, the scale is used to weigh gold at +25 °C
and + 60 °C, first utilizing thin film technology for the gain resistors and
then using the FRSM foil resistors.

At +25 °C, both the thin film and FRSM resistors measure 200 grams of gold for
a value of $11,400. With an ambient temperature increase to +60 °C, however,
the assembly utilizing precision thin film resistors weighs the gold as 197.8
grams for a value of $11,277 — which represents a “loss” of $123. The same
assembly using FRSM foil resistors is not affected by the temperature change,
providing an accurate measurement of 200 grams at +60 °C — and no loss in
measured value.

“Increasingly, innovative semiconductor companies such as Intersil are
recommending high precision VFR foil resistors as part of the reference
designs for precision analog applications,” said Yuval Hernik, senior director
of application engineering for Vishay Foil Resistors. “This is because
precision amplifiers such as the ISL28617 depend upon the matching of gain
resistors for accuracy. Changes in gain ratios due to thermal and
environmental stress result in errors at the output, which, as the video
shows, can lead to a significant and costly loss.

“Harmonic distortion is also a key feature when choosing resistors.
High-precision Bulk Metal Foil resistors have less distortion for a given
signal than other resistor technologies. For example, FRSM resistors offer a
tolerance of 0.01% and a TCR of 0.2 ppm/°C for exceptional gain accuracy. For
circuits requiring a high degree of accuracy in every operating environment,
the resistors provide unmatched stability through temperature excursions, load
life and extraordinary environmental stresses. For the ISL28617 and other
precision amplifiers, the FRSM is the device of choice.”

Further information about the FRSM and other Vishay Foil Resistors products is
available at www.vishayfoilresistors.com or via email to foil@vishaypg.com.
Follow Vishay Foil Resistors at http://twitter.com/foilresistor.

About Vishay Precision Group

Vishay Precision Group (VPG) is an internationally recognized designer,
manufacturer and marketer of: components based on its resistive foil
technology; sensors; and sensor-based systems specializing in the growing
markets of stress, force, weight, pressure and current measurements. VPG is a
market leader of Foil Technology Products, providing ongoing technology
innovations in precision foil resistors and foil strain gages, which are the
foundation of the Company’s Force Sensors Products and its Weighing and
Control Systems. The product portfolio consists of a variety of
well-established brand names recognized for precision and quality in the
marketplace. To learn more, visit VPG at www.vishaypg.com.

About VPG Foil Resistors

VPG Foil Resistors, a part of Vishay Precision Group (VPG), produces the most
precise and stable resistors available. Distinguished by the premier brands
Vishay Foil Resistors, Powertron and Alpha Electronics, the VPG Foil Resistors
portfolio includes discrete resistors and resistor networks in surface mount
and through-hole (fixed-lead) configurations; customized chip resistor
networks; precision trimming potentiometers; and discrete chips for use in
hybrid circuits. These devices are used in applications requiring a high
degree of precision and stability, such as in medical testing equipment,
semiconductor equipment, precision measuring instruments, aerospace and
military applications. To learn more, visit www.vishayfoilresistors.com.

Link to video screen shot: 
http://www.flickr.com/photos/47034298@N02/8522734738

Contact:

Vishay Precision Group, Inc.
Marti Spalding, +1 919-374-5515
Director, Global MarCom
Marti.Spalding@vishaypg.com
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