Precision High Capacity Resistor
Model 1282

• Temperature coefficient ≤ 10 ppm/K
• Nominal load 20 W
• Ranges 1 mΩ ... 100 mΩ
• Four-terminal measurement principle
• Accuracy 0.02 %
• For technical frequency 50 Hz

Application

High capacity resistors model 1282 are distinguished by high quality. In their specifications they nearly reach values which are reserved to resistance standards. Consequently they are used - e. g. in connection with very precise digital voltmeters - as measuring resistors for accurate registration of direct and alternating currents up to 200 A. The compact construction supports universal application. The exceptional low temperature coefficient extends the scope of application a second time: Currents are also exactly determined where the surrounding temperature strongly changes. Rational testings are possible by shortest warm-up period (resp. warm-up falsification).

Besides the broad spectrum of possible applications attention has to be paid especially to the scope of quality- and reliability testing. Measurements effected in regular and irregular intervals give reliable information on the quality level of structural parts, instruments and systems.

Description

Technologies already approved with our precision and calibration resistors - which especially guarantee a secure conduction of the dissipation heat - have been transferred to the precision high capacity resistors. Those are designed on fourterminal measurement principle. The voltage path is equalized to the accuracy of 0.02 %, (with reference temperature = 23 °C).

At maximum load a temperature increase within the resistor occurs. This temperature increase is compensated by a large surface area of the cooling body. The heat resistance of the resistors described is 1 K/W: The temperature of the resistor rises 1 K per Watt of supplied energy. Unfavourable installation with insufficient possibility of ventilation and cooling have to be taken into consideration accordingly.

All power and limiting values of the diagrams overleaf refer to the resistor material MANGANIN®. The potential tap is effected via copperterminals of low thermo-electric force. The screwterminals for the current feed are dimensioned according to the maximum capacity.