RARA ELECTRONICS COMPANY-IRV/IRH Specifications

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A-H FOUR TERMINAL
PRECISION RESISTORS

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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 power
units, current sources and electronic loads. Other applications include: Current measurements in pulse width
modulated(PWM) control circuits as in servo and stepper motors and solenoid driver circuits.

GENERAL SPECIFICATIONS

Model

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 test

Operating 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

　

　

　

DIMENSIONS

DERATING

ORDERING PROCEDURE EXAMPLE

Model	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)

Operating 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