CURRENT SENSING RESISTORS

A-H resistors are constructed with four terminal, isolated voltage and current connections (i.e. Kelvin Connection)making them suitable for very precise current measurements, current limitations and current regulation in powerunits, current sources and electronic loads. Other applications include: Current measurements in pulse widthmodulated(PWM) control circuits as in servo and stepper motors and solenoid driver circuits.GENERAL SPECIFICATIONSModel Resistance Load Capacity TCR [ppm/C](R>20mohms) Tolerance A-H (1, 2, 5, 22, 50, 100,200, 500)mohms(1, 2, 5, 10, 20,100)ohms 10W(with heatsink) <+-10ppm/K(20C t0 60C) 0.1(B)0.5(D)1(F) CHARACTERISTICS Values in [ ] mean change in ohmic value after testOperating Temp. Range -55C to 125C Dielectric Withstanding Voltage 500VAC Load Capacity 10W with heatsink Thermal Resistance to Aluminum Base Plate Rth < 3C/W Thermal Resistance to Ambient Temperature 15C/W Inductance (R=10mohms) <10nH Stability at 125C Foil Temperature Deviation <0.1% after 2000 hours DIMENSIONSDERATINGORDERING PROCEDURE EXAMPLE Copyright?, RARA Electronics Corporation