Models 278610 and 278620 six-dial decade resistance boxes allow quick and easy setting of a wide range of resistance. These resistance boxes are used in combination with voltage or current standards to adjust voltage or current, as dummy load resistances or as an arm of AC bridges.

Specifications – Model 278610

Resistance Range
0.1 to 111,111Ω (Six decade dials)

Residual Residence
Less than 23mΩ

Power Rating
0.3W/Step, Within 3W for overall instrument

Maximum Allowed Input
0.5W/Step, 5W for Overall Instrument

Maximum Circuit Voltage
250V

Operating Temperature Range
0 to 40°C ( 32 to 104°F)

Storage Temperature Range
-10 to 50°C (14 to 122°F)

Humidity Range
25 to 85% relative humidity

Insulation Resistance
More than 500MΩ at 500V DC between panel and circuit

Dielectric Strength
1,500 V AC for one minute

Dimensions
116 × 497 × 120 mm 4 5/8 × 19 5/8 × 4 3/4 in

Weight
7.76 lbs 3.5 kg

Specifications – Model 278620

Resistance Range
1 to 1,111,110Ω (Six decade dials)

Residual Residence
Less than 23mΩ

Power Rating
0.3W/Step, Within 3W for overall instrument

Maximum Allowed Input
0.5W/Step, 5W for Overall Instrument

Maximum Circuit Voltage
250V

Operating Temperature Range
0 to 40°C ( 32 to 104°F)

Storage Temperature Range
-10 to 50°C (14 to 122°F)

Humidity Range
25 to 85% relative humidity

Insulation Resistance
More than 500MΩ at 500V DC between panel and circuit

Dielectric Strength
1,500 V AC for one minute

Dimensions
116 × 497 × 120 mm 4 5/8 × 19 5/8 × 4 3/4 in

Weight
7.76 lbs 3.5 kg

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