Showing posts with label Special-Resistors. Show all posts
Showing posts with label Special-Resistors. Show all posts

Monday, December 7, 2015

Precision Resistors - UNS 4-T220 - Riedon

These Precision Shunt Resistors are designed for systems which have a fast changing electrical load. It has a Heatsink and is encapsulated in epoxy. The substrate is Alumina for Good Heat Transfer but with Electrical Insulation. It is a Resistor formed by a NiCr Foil. (Like Nichrome).

Precision Resistors - UNS 4-T220 - Riedon

 Precision Resistors - UNS 4-T220 - Riedon
Specifications
  • Resistance from 0.2 Ohm to 80 Ohms
  • Power Rating to 15 Watts
  • Resistance Tolerances to ±0.01%
  • TCR to ±1ppm/K
  • Load Stability to 0.01%
Here are some documents that will build your awareness on how Resistors work and their Thermal behavior. These are from a firm called Riedon who design manufacture custom resistors and special resistors used in tight design requirements.

Resistors are probably the most common and well known of all electrical components. Applying a resistor to a circuit normally requires (1) calculating the nominal values needed in the circuit application (resistance, power rating, etc.) then (2) developing acceptable tolerances for the resistor that ensure it will function properly in all extremes of the application.

Read up the "Temperature dependence and TC" - The absolute ohmic value of a resistor is temperature-dependent. Also the "Definition of terms in the specifications of Resistors."

Riedon Inc
300 Cypress Avenue Alhambra, CA 91801, USA

Thursday, May 26, 2011

SM Series High-Value Resistors - Ohmcraft

SM Chip Resistors go to values in giga-ohms. The Technology - Micropenned serpentine patterned resistors, engineered for ultra precision.

SM Series High-Value Resistors - Ohmcraft
SM Series High-Value Resistors - Ohmcraft

These are surface mount resistors, the Resistive Element is Thick Film on Alumina Substrate. We can get Voltage Ratings upto 600 Volts and 50 Gigohms Values. Low noise high stability resistors.

Ohmcraft - Micropen Technologies Corporation
93 Paper Mill St., Honeoye Falls, NY 14472

Wednesday, June 24, 2009

Tera Giga Ohm HV Resistors - SRT Resistor Technology

Tera Giga Ohm HV Resistors - SRT Resistor Technology

Some Specs -

  • Resistance range 500 R - 100 T
  • Tolerances 1%, 2%, 5%, 10%
  • Temperature coefficient ± 20ppm/K - 150ppm/K
  • Temperature range -55°C - +225°C
  • Insulation Resistance 10000M min.

SRT Resistor Technology -

SRT Resistor Technology GmbH - Germany - Development and production of high-grade resistors and special products, including the production equipment.

High Voltage Resistors from Caddock

High Voltage Resistors from Caddock

Some Specs

  • Single-resistor values as high as 10,000 Megohms.
  • Maximum continuous operating voltages as high as 48 KV.
  • Resistance Tolerances from ±1.0% to ±0.1%.
  • Temperature Coef´Čücient, 80 ppm/°C Std. Range.

Caddock Electronics - resistor networks, high voltage resistors, current sense resistors, chip resistors.

Tuesday, June 23, 2009

Ultra High Resistance -Super Mox - Ohmite

Super Mox Series – High Voltage Non Inductive Axial
Highlights
Super Mox Series - High Voltage Non Inductive Axial
  • High Voltage Non Inductive Axial
  • Power rating 3.8-20 watts
  • Resistance range 1K -50 gig; up to 1 Tera ohm available
  • 0.05%-10% Tolerance
  • TCR values as low as 10ppm
  • Up 90KV voltage handling
  • Non-Inductive design

Ohmite Electronic components Power resistors
Ohmite Manufacturing Company has been a leading provider of resistors for high current, high voltage and high energy applications for over 80 years.

(I used 100 Giga Ohm and 1 Tera Ohm Glass Encased Victoreen Resistors and an Electrometer from Princeton Applied Research to calibrate my Insulation Tester TeraOhm - delabs)