The CLA ultra-precision thermosensitive resistor series from Alpha Electronics offers a highly accurate device that has a resistivity which varies linearly with temperature change in a through-hole package. By utilising Alpha’s Bulk Metal® foil resistor technology, they are able to produce these resistors that are ideally designed for temperature detection, providing a small size and rapid response.

• Ultra-precision thermosensitive through-hole resistor
• Stocked in both 10Ω and 100Ω resistance values with a tolerance of ±0.5%
• Available in any resistance between 5Ω and 100Ω
• Tolerance options from ±5.0% down to ±0.5% available
• Linear +4250 ±1% ppm/°C TCR characteristic (from 0 to +100°C)
• Response time of 0.9 seconds
• Maximum working voltage of 250V
• Power rating of 0.125W (at +70°C)
• Maximum rated operating temperature +70°C
• Temperature range from -65°C to +125°C

These Alpha CLA ultra-precision thermosensitive resistors are made of material only a few µm thick and respond rapidly to temperature changes. Strict control of foil composition maintains uniform quality without fluctuation of temperature characteristics of resistance. They are produced by the same fine photo-etching technology used in other metal foil precision resistors from Alpha.

The CLA series has a pin pitch of 2.54 ±0.25mm.

Typical applications for the CLA ultra-precision thermosensitive resistor series include:

• Cold junction reference for thermocouples
• Temperature compensation in load cells
• Temperature compensation device in semiconductor circuits
• Temperature sensing devices

The below table gives the full specifications for each resistor model available including the Alpha CLA series:

* Symbols parenthesized are for part number composition

• Current / voltage conversion adaptor
• Compact size
• Lightweight
• Full resistance range available from 1Ω to 100kΩ
• Temperature coefficient of ±2.5 ppm/°C
• ±0.1% accuracy
• Maximum working current of up to 0.5A (ATV-1R0 1Ω model)
• Power rating of 0.1W (0.25W for the ATV-1R0 model)

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:

• Fully customisable 1-dial resistance box (up to 24 resistance values)
• Up to 5-digit resistance values on switching contacts may be specified
• Resistance values available from 1Ω up to 1MΩ
• Improved work efficiency and elimination of careless mistakes
• Lightweight, compact size
• High precision
• High stability

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.

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.

• 6-Dial decade resistance box
• Accuracy down to ≤0.005% +2mΩ for some models
• Temperature coefficient of resistance ≤5ppm /°C
• Long-term stability in resistance ≤50ppm/year (storage life)
• Low contact resistance switch and three clip-typed contacts in parallel
• Low thermal EMF terminal
• Double electrical shielding protective against noise
• Maximum power rating of 0.5W

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:

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:

* Power = Power rating.Da