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Cropico RM8

Wide range, compact and versatile 8 decade resistance box with double pole switching

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Overview

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8 decades

Wide range 0.01 ohm to 1 Mega ohm

Accuracy 0.1%

Cropico RM8 Decade Resistance Box

The model RM8 decade resistance box is designed to complement our range of resistance boxes, offering a very wide range 0.01 ohm to 1 Mega ohm in a compact and versatile unit.

The low decade steps of 0.01 ohm enable very high resolution, when simulating resistance values and the power rating is 1.0 watt per coil. The RM8 uses double pole switching to minimize the effects of contact resistance.

The lower value decades (0.01 and 0.1 ohm) are manufactured from Manganin resistance wire and the other decades from selected metal film resistors. This offers good stability combined with excellent load and temperature coefficients.

Housed in a hardwood case with metal panel the size is only 254 x 145 x 80mm and the connections are with 4mm binding posts that will accept spade or banana plugs.

Technical specification

Decade	Accuracy	Max. Current
10 x 100kohm	± 0.1%	0.003A
10 x 10kohm	± 0.1%	0.01A
10 x 1kohm	± 0.1%	0.33A
10 x 100ohm	± 0.1%	0.1A
10 x 10ohm	± 0.5%	0.3A
10 x 1ohm	± 1%	1.0A
10 x 0.1ohm	± 5%	1.0A
10 x 0.01ohm	± 10%	1.0A

Resistors	Rotary 2 pole in parallel, contacts silver plated brass with positive click mechanism. Insulation > 50,000 Megohm
Switches	Insulated will accept 4 mm banana plugs and spade tags.
Residual Resistance	<0.1ohm
Terminals	2 binding posts will accept 4 mm banana plugs and spade tags. 1 terminal for connection to panel/earth
Test Voltage	1kV dc between terminals and panel
Maximum continuous working voltage	70Vdc / 33vrms
Size	254 x 145 x 80mm
Weight	0.95kg