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Alpha Electronics

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Alpha USR-SF Series

Ultra-stable primary standard resistor
Resistance range from 1Ω to 10KΩ
Accuracy of ±2 ppm
TCR of ±0.05 ppm/°C
Power rating of 1W
long-term stability of resistance 0.5 ppm/year

Alpha ASR Series

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

Alpha CSR Series

Extremely stable primary standard resistor
Resistance range from 0.001Ω to 100MΩ
Accuracy from ±5 ppm to ±100 ppm
TCR from ±1 ppm/°C to ±10 ppm/°C
Power rating of 0.01W, 0.1W or 0.5W
Long-term stability of resistance from ±5 ppm/year

Alpha LSR Series

High power standard resistor
Nominal resistance values of 0.001Ω, 0.01Ω or 0.1Ω
Accuracy of ±25 ppm, ±50 ppm or ±100 ppm
TCR of ±2.5 ppm/°C
Power rating of 1W or 4W
Long-term stability better than 20 ppm/year