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Here at Rhopoint Nordic we offer a range of high quality standard resistors for calibration and measurement use. Manufactured by two of the industry leaders on the precision resistor market - Alpha Electronics and Isabellenhütte, our standard resistors are available in several configurations and second-to-none stability and reliability. Browse our range below.
Can't find what you're looking for or looking for technical advice? Contact our technical sales department.
The ADR 1-dial resistance box series from Alpha Electronics offers a range of standard resistors which are ideally suited for repetitive daily work. The single dial system means the resistance is easily switched from one value to another. This greatly improves work efficiency and helps to avoid mistakes, which may happen when using a 6-dial decade standard resistor. They are ideally suited for RTD simulation for platinum (Pt) related products and conductive meters.
The resistance elements utilise Bulk Metal® Foil technology and the connections to the rotary switch are made by using 4-terminal junctions. This ensures that high precision, high stability and low temperature coefficients are achieved.
The ADR-1xxx 1-Dial resistance box is fully customisable. Up to 24 different resistance values can be set into the box.
The ADR-1xxx series has a weight of approximately 1kg and dimensions of 100mm x 150mm x 80mm.
The below table gives the full specifications available for the Alpha ADR 1-dial resistance box series:
Tolerance and temperature coefficient varies with resistance values.
£0.00 Ex Tax: £0.00
The ADR 6-dial decade resistance box series from Alpha Electronics, with 6½ digit readings, features ultra precision resistors, low contact resistance rotary switches, low thermal EMF output terminals and the double shielded construction. There are 5 models of the ADR 6-dial decade resistance box available, each offering different resistance ranges starting from 0.1Ω minimum to 1.111210KΩ maximum up to 10Ω minimum to 11.11110MΩ maximum.
All resistors used in this Decade Resistance Box are from the ultra precision Bulk Metal® Foil resistors manufactured by Alpha Electronics, assuring high stability over time and environment change.
The rotary switches have very low contact resistance which is achieved by connecting three clip-type contacts in parallel. This method also ensures a higher mechanical reliability. Low thermal EMF output terminals use a low thermal resistance rectangular wire circuit configuration. A double shielded construction inhibits interference of environmental noise.
The ADR 6-dial resistance box series has a weight of approximately 4.5kg and dimensions of 430mm x 140mm x 99mm.
The below table gives the full specifications for each model available of the Alpha ADR 6-dial decade resistance box series:
£0.00 Ex Tax: £0.00
The ASR series from Alpha Electronics is an extremely stable standard resistor. It utilises their Ni/Cr alloy Bulk Metal® Foil technology for the resistive elements, which helps provide high stability and a low temperature coefficient. With the extreme stability of this resistor relative to temperature change, the ASR can be used in air without the need of an oil bath or critical environmental temperature control, eliminating added operation and maintenance costs.
Due to Alpha Electronics long-term experience in developing and enhancing ultra-stable Bulk Metal® Foil technology, they are able to provide products with consistency of performance under strict quality control. The ASR is designed to be used in a wide range of environments; from making precise measurements on the production floor, to providing corporate traceability as a calibration and reference standard.
The resistors are mounted within a compact and sturdy box. A cover is provided to protect the resistors and connection terminals from damage during transport and storage.
The ASR series has a weight of approximately 2.5kg and dimensions of 155mm x 97mm x 112mm.
The below table gives the full specifications for each model available of the Alpha ASR series:
* Power = Power rating.
£0.00 Ex Tax: £0.00
The ATS series from Alpha Electronics is a resistance transfer standard used to calibrate working standard resistors by using a primary resistor. The ATS series consists of 10 high precision resistors of the same nominal value (R) which are connected in series known as Haymon bridge construction. The ATS unit can be used as a standard resistor due to the low temperature coefficient and high stability features of Alpha Electronics Bulk Metal® foil technology, ensuring very tight matching accuracy.
The ATS-LC lead compensator and the ATS-SC shorting bar are available as additional options.
The ATS series has a weight of approximately 3kg and dimensions of 180mm x 70mm x 332mm.
The below table gives the full specifications for each model available of the Alpha ATS series:
£0.00 Ex Tax: £0.00
The ATV series from Alpha Electronics is a current / voltage (I/V) conversion adaptor used to accurately measure current using a voltage meter. Its small, lightweight construction enables it to be easily attached directly to a voltage meter for ease of operation.
Each model corresponds to a set resistance value and maximum working current.
The below table gives the full specifications for each model available of the Alpha ATV series:
£0.00 Ex Tax: £0.00
The CSR working standard resistor series from Alpha electronics uses Bulk Metal® foil resistance elements, which have the same excellent stability and low temperature coefficient of resistance as the ASR series. Alpha's Bulk Metal® foil offers a precision that cannot be matched by any other resistance material. The CSR series can be customised to any resistance value from 0.001Ω up to 100MΩ.
The CSR is designed for equal ease of use either in laboratory conditions or on the production floor. The construction of the CSR series is designed to give ease of transport and storage, and can be used in normal air environments without the need for oil bath submersion.
The CSR series has a weight of approximately 300g and dimensions of 100mm x 65mm x 66.5mm.
The below table gives the full specifications for each model available of the Alpha CSR series:
£0.00 Ex Tax: £0.00
The LSR high power standard resistor series from Alpha Electronics was developed to meet the requirements of high current / low resistance applications. Bulk Metal® Foil resistive elements are used to ensure the best long-term stability and lowest temperature coefficients are achieved. The enclosure is manufactured from perforated aluminium to allow effective air flow and temperature dissipation during high power operation. The LSR series is designed to be used in air without oil bath submersion or additional cooling.
LSR high power standard resistor series is suitable for a range of applications such as high precision measurement, corporate metrology calibration labs and references for precision power supplies.
The 1mΩ version has an option to change the terminal knobs for 4W (63A) power measuring capabilities. The P at the end of the model number denotes the high power option.
The LSR series has a weight of approximately 0.6kg and dimensions of 140mm x 90mm x 90mm.
The below table gives the full specifications for each model available of the Alpha LSR series:
£0.00 Ex Tax: £0.00
The MSR series from Alpha Electronics offers a compact standard resistor suitable for the calibration of low resistance milliohm meters. The internal construction and connection terminals are designed to optimize AC characteristics and minimize the effect of thermoelectromotive force. Alpha's Bulk Metal® Foil resistive elements are used to ensure the best long-term stability and lowest temperature coefficients are achieved. The MSR calibration resistor is a cost effective and simple product, offering both high stability and low temperature coefficient.
The MSR is a compact standard resistor suitable for daily calibration of milliohm meters, etc. Although the MSR series is a low cost, easy to use product, it offers both high stability and low temperature coefficient. The MSR is most suitable as a standard resistor to be used on the job site.
The MSR series has a weight of approximately 150g and dimensions of 50mm x 44mm x 65mm.
The below table gives the full specifications for each model available of the Alpha MSR series:
£0.00 Ex Tax: £0.00
The USR-SF series from Alpha Electronics is an ultra-stable primary standard resistor which is an enhanced version of the USR / ASR series. The ultra-stable resistive element utilises the new generation stress-free Bulk Metal® foil technology, which results in an extremely low temperature coefficient of ±0.05 ppm/°C at +23°C ±5°C. This performance is unique to Alpha Electronics throughout the world.
The stress-free resistance element eliminates stress factors by using a special treatment process, and is encapsulated in a specially-designed ceramic case to protect against humidity, oxidation and vibration during transportation. Alpha's Bulk Metal® foil construction provides excellent AC characteristics, superior in performance compared to conventional wire-wound standard resistors.
The USR-SF, with its extreme long-term stability and low TCR, can be used in normal air environments, which eliminates the additional cost of operating and maintaining oil baths.
The USR-SF series has a weight of approximately 2.2kg and dimensions of 155mm x 97mm x 112mm.
The below table gives the full specifications for each model available of the Alpha USR-SF series:
* Rated power will be different for future additional lower resistance values
£0.00 Ex Tax: £0.00
