Spec Sheet R4611/1 July 97

Precision Resistor Type RUG-Z

( Technical modifications reserved )

dimensions ( mm )

Case dimensions are compatible to high-power transistor

modules to a great extent. Current feed is accomplished

with a screw connection between cable and copper

U-terminal. The distortion-protected nut recessed in the

module considerably facilitates assembly.

Pulses up to 1000 W are without detrimental effect based

on the optimized geometrical design and temperature

resistance of the adhesive.

This high-power resistor in four-terminal design was espe-

cially developed, where high DC or AC currents of low

frequency have to be regulated with precise accuracy and

reproducibility like in current supplies for superconducting

magnets.

When assembled on an air or watercooled heatsink, the

resistance deviation caused by temperature change and

temperature coefficient is in most instances negligibly

small.

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power derating curve

0

20

40

60

80

100

120

case temperature T

0.25

0.5

0.75

1

P / P

Nenn

Temperature dependence of the electrical resistance

of ISA-PLAN resistors

Technical data

resistance range

1 / 2 / 5 / 10 / 20 / 50 / 100 / 200 / 500mOhm - 1 / 10 / 100Ohm

tolerances

0.1%, 1%

temperature coefficient tcr ( R > 20mOhm )

< ±1 / ±3 / ±5 / ±10ppm/K ( 20°C to 60°C )

applicable temperature range

-55°C to +85°C

load capacity

250W

single pulse power load ( R < 10mOhm )

50J ( tp < 10ms )

thermal resistance to copper base plate

Rthi < 0.1K/W

dielectric withstanding voltage

500VAC

inductance

< 10nH

stability

deviation <0.1% after 2,000h