Monday, December 21, 2009

High Voltage Resistors

Riedon's high temperature resistors has been selected to be used on Vapor Stone Rail Systems, specifically on their passenger door development systems.

Tuesday, November 24, 2009

Why Choose Riedon For Your Special RTD Requirements

Riedon has manufactured high-precision wirewound resistors for OEM industries since 1960. These precision resistors have tolerances as small as 0.005%. They are extremely stable over time, and operate over wide operating temperatures.

Resistors this precise and stable require unusual design and manufacturing skills that absolutely manage the desirable properties of the resistor element wire, while minimizing undesirable characteristics that cause unpredictable errors and instabilities. These same design and manufacturing skills are as critical in RTDs as they are in precision resistors!

A Resistance Temperature Detector (RTD) is a resistor designed to measure temperature using the known resistance vs. temperature relationship of metals. An RTD element is the actual temperature-sensing unit. It is typically unprotected and offers only the element leads for terminations. An RTD probe is an assembly composed of an element, a sheath or tube to protect the element and provide a thermal path to the measurement, lead wires, and a termination or connection.

Continue to Read hear

Thursday, November 19, 2009

Using Power Resistors as Heaters

Power resistors and resistance heaters share many common design considerations. In both products, good thermal design ensures low thermal resistance between the element and the exterior environment. Both must be rugged and reliable.

Power resistors are often used in heater applications. They allow a designer to apply and control heat to a small area. Riedon offers a broad range of these resistors. If one of our standard resistors won't do we can modify existing products or create new designs to fit your special requirements.

Riedon power resistors are used in a variety of heater applications. They are especially useful in situations where the heat must be isolated or concentrated in a small area.

Continue to read here.

Monday, November 16, 2009

Current Sensing Resistors

Sudden current or voltage changes are often hazardous to electronic products. For example, transients or surges that reach microprocessor or memory components can destroy those expensive parts, and wipe out critical programming and data. Many electronic products now include surge protection circuits.

In these circuits, low value resistors sense when the current is too high so that measures can be taken upstream before the excess current causes damage. Wirewound resistors are a popular choice for these applications. They are inexpensive, available in low resistance values, have low temperature coefficients and good surge-handling capability. Riedon has served this application for years with their "LO OHM" power resistors.

Riedon’s SL resistors add an additional application advantage. We designed them for PC board surface mounting to satisfy the growing demand for new high density boards fabricated with automated pick-and-place equipment.

Continue to read here.

Thursday, November 5, 2009

A Praise For Riedon Resistors!

We received this email from a valued customer which we would like to share with you:

"....I have been a strong advocate of Riedon resistors here at PCI and you make it easy for me to continue to be.

Riedon presently manufactures a shunt resistor of my design (Riedon P/N: SP1669-0R0013N1). I can tell you that this resistor has performed flawlessly and we have enjoyed 100% reliability zero failures in over 4000 units (millions of unit-hours of operation)! Please convey my sincere gratitude to your workforce! Their attention to detail is evident in the quality of the product we receive from Riedon. Thank you!"

~Performance Controls, Inc.

Tuesday, November 3, 2009

Distributors boost technical support offerings

Distributors are seizing this opportunity to showcase one of their core competencies: providing a one-stop shop for a variety of components and technologies. Even though the channel has cut personnel during the recession, distributors are retaining and even making select investments in applications engineers, Web tools, technical training seminars, and other types of design assistance. “Technical competence is going to be one of the major trends shaping the distribution channel as we move forward,” said Vallee.

Continue to read here.

To find our techinical reps and distributors, click here.

Tuesday, October 20, 2009

How to design guide for precision resistors

Even in this digital age, a number of measurement and instrumentation applications rely on the accuracy of the value of one or more resistors. There are essentially three types of error source to be understood:

  1. Measurement errors - which limit the precision with which the actual resistance value can be known.
  2. Short-term change factors - reflecting uncertainty in the resistance value in a customer’s recently assembled PCB.
  3. Long-term change factors - reflecting value drift throughout the product’s life.

Continue to read here

Tuesday, October 13, 2009

Riedon resistors is used in critical medical systems

Each year, more than 250,000 Americans die from sudden cardiac arrest. With recent technological advances, a portable lifesaving device called the automated external defibrillator has been invented. It is an important life saving device, and has saved many . Riedon sells resistors to some of the major defibrillator manufacturers.

Resistors are a critical part of this system. A stable and repeatable measurement of the charging voltage is a critical funtion of this circuit, as this determines the amount fo electrical energy delivered to the patient.

Check our wesite for more infromation:

Tuesday, October 6, 2009

Are you looking for a quick turnaround?

Call our reps in the area. Here is the list of representitves. Click on each one to go to their website:

Looking for excess resistors' inventory?

Call us at 626-284-9901.

Wednesday, September 30, 2009

How to design guide for precision resistors

Even in this digital age, a number of measurement and instrumentation applications rely on the accuracy of the value of one or more resistors.

To guarantee the performance of the system, the designer must understand what factors can affect the value of a precision resistor, and how the combined effect of these factors may be evaluated.

There are essentially three types of error source to be understood. The first is measurement errors, which limit the precision with which the actual resistance value can be known. Secondly, short-term change factors, reflecting uncertainty in the resistance value in a customer's recently assembled PCB. Thirdly, long-term change factors, reflecting value drift throughout the product's life. The combination of all these factors is termed total excursion.

Continue to read here.
Or to buy a precision resistor visit our website, Riedon, Inc.

Monday, September 28, 2009

Do you have overvoltage surge problem??

Wirewound resistors, ideal at handling overvoltage surges, are often specified for the surge and overload conditions of harsh environments. The core of a wirewound resistor typically consists of fiberglass or a ceramic rod, with metallic wire wrapped around the substrate. While ceramic is more expensive, it acts as a heat sink and provides for an increase in efficiency as the surge event lengthens, whereas fiberglass provides little thermal benefit in overload situations.

There are several ways to increase the surge capability of a wirewound resistor. First, carefully selected longer lengths of larger diameter (lower resistance) wire can be tightly wound on the substrate. This leads to an increased resistance element mass. Additionally, the surge capability can be increased by using two layers of wire and winding them in opposite directions to reduce the resistor's inductance. Not only does this decrease the inductance, but it also increases the resistance wire mass, which in turn improves the resistor's surge handling capability.

Continue to read more about resistors and over-voltag issues here.

Thursday, September 24, 2009

Find Us At Digikey!

Did you know that you can buy our products at DigiKey? Here is the link : click Here.

Wednesday, September 23, 2009

Resistor Technology Comparison

Click on the image to see it in a larger size.

Monday, September 21, 2009

Riedon Resistors

Welcome to Riedon's first blog post. Through this blog we hope to support our customers, reps and distributors in ways no other resistor company has been able to do. We will be posting resistor news, new applications where our power and precision resistor are being used, success stories and general industry news.
The values we offer to our costumers are:

  • Immediate personalized technical support and problem solving
  • Flexible manufacturing systems enable us to support orders of just 100 resistors through to 1 million pieces with the same support and enthusiasm.
  • Custom application support and design, utilizing our global engineering and technical resources.
  • Industry best lead times!!!! without question

Power Resistors, Precision Resistors, High Voltage Resistors

See our full product line at