Alpha ASR Series

  • Compliant
  • Alpha Electronics

Product Features

  • Extremely stable primary standard resistor
  • Resistance range from 1Ω to 10MΩ
  • Accuracy of ±5 ppm or ±10 ppm
  • TCR of ±0.2 ppm/°C
  • Power rating of 0.5W or 0.1W
  • long-term stability of resistance <3 ppm/year

Applications

  • Test and Measurement

Description

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.

  • Standard Resistor
  • Excellent long-term stability of resistance, less than 3 ppm/year
  • Low temperature coefficient, less than 0.2 ppm/°C
  • Resistance options between 1Ω to 10MΩ available
  • Excellent AC characteristics due to Bulk Metal® Foil technology
  • Compact construction designed for simple operation and storage
  • Power rating of 0.1W (0.5W for the ADR-1R0 model)
  • Maximum working temperature of +50°C
  • Temperature range of 0 to +50°C
  • Storage temperature range from -10°C to +60°C

 

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:

Alpha ASR Specifications
* Power = Power rating.

 

Specifications

Weight 2.50000 kg
Dimensions 155.00 × 97.00 × 112.00 mm
Product Type

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Model / Part Number

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Minimum Resistance

Series / Model

Maximum Resistance

Power Rating

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Temperature Coefficient

Accuracy

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Temperature Range (°C)

Alpha ASR Series Resources

Product Datasheet

Supporting Product Information

Supporting Manufacturer Information

Alpha Resistor Videos

We are pleased to provide you with a range of videos, please see below for the latest content available:

 

 

VIDEOS
Place holder video for YouTube video Resistor Stability Put to the Test (Demo Video)

In this video, our host Richard Zuratt puts the stability of the three major resistor technologies — foil, thin, and thick film — to the test. Each resistor type is subjected to an overload pulse and its change in resistance value is recorded. Due to the homogeneous nature of the VPG Bulk Metal® Foil resistor, it is the only of the three to experience no change from the high power pulse. This demonstrated performance makes foil resistors the technology of choice for critical applications where long-term stability and survivability are paramount.

Place holder video for YouTube video Advantages of Using Bulk Metal® Foil Resistors in High-Humidity Environments

All resistors that are based on nichrome, which is a category that includes both thin film devices and Bulk Metal Foil resistors, are susceptible to electro-chemical corrosion or etching when placed in a high humidity environment and powered with a very low wattage. But since the nichrome element of a Bulk Metal Foil resistor is hundreds of times thicker than the element in a thin film device with the same value, it will last much longer under these conditions. This video shows the actual etching process and survival times for thin film and foil nichrome resistive elements as they are tested in 100% humidity conditions.

Place holder video for YouTube video Comparison Testing of Chip Resistor Technologies Under High Vibration

Surface-mount resistors suffer physical stresses when exposed to high vibration or thermally unstable environments. Failure modes commonly occur in welds, solder joints, connectors, and terminations, ultimately resulting in circuit failure. In this demonstration, vibration-table-mounted boards are subjected to ±2° deflection 25 times per second and monitored for any ΔR > 0.1%. All the chip resistors failed in 2 to 12 minutes (8K to 16K cycles). But the Alpha MPP molded Bulk Metal® Z-Foil resistor with flexible terminations experienced over a million cycles with no change in resistance.

VIDEOS
Place holder video for YouTube video
Resistor Stability Put to the Test (Demo Video

In this video, our host Richard Zuratt puts the stability of the three major resistor technologies — foil, thin, and thick film — to the test. Each resistor type is subjected to an overload pulse and its change in resistance value is recorded. Due to the homogeneous nature of the VPG Bulk Metal® Foil resistor, it is the only of the three to experience no change from the high power pulse. This demonstrated performance makes foil resistors the technology of choice for critical applications where long-term stability and survivability are paramount.

Place holder video for YouTube video
Advantages of Using Bulk Metal® Foil Resistors in High-Humidity Environments

All resistors that are based on nichrome, which is a category that includes both thin film devices and Bulk Metal Foil resistors, are susceptible to electro-chemical corrosion or etching when placed in a high humidity environment and powered with a very low wattage. But since the nichrome element of a Bulk Metal Foil resistor is hundreds of times thicker than the element in a thin film device with the same value, it will last much longer under these conditions. This video shows the actual etching process and survival times for thin film and foil nichrome resistive elements as they are tested in 100% humidity conditions.

Place holder video for YouTube video

Surface-mount resistors suffer physical stresses when exposed to high vibration or thermally unstable environments. Failure modes commonly occur in welds, solder joints, connectors, and terminations, ultimately resulting in circuit failure. In this demonstration, vibration-table-mounted boards are subjected to ±2° deflection 25 times per second and monitored for any ΔR > 0.1%. All the chip resistors failed in 2 to 12 minutes (8K to 16K cycles). But the Alpha MPP molded Bulk Metal® Z-Foil resistor with flexible terminations experienced over a million cycles with no change in resistance.

Alpha ASR Series

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