MALVERN, Pa.--(BUSINESS WIRE)--
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 [email protected].
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/[email protected]/8522734738
Vishay Precision Group, Inc.
Marti Spalding, +1 919-374-5515
Director,
Global MarCom
[email protected]
Source: Vishay Precision Group, Inc.