Model 1282 - 2 Pages

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Model 1282

Catalog excerpts

Resistors burster Code:    1282 EN Delivery:    ex stock/16 weeks 1282 EN ■ Temperature coefficient < 10 ppm/K ■ Nominal load 20 W ■ Ranges 1 mQ ... 100 mQ ■ Four-terminal measurement principle ■ Accuracy 0.02 % ■ For technical frequency 50 Hz Application In connection with very precise digital voltmeters the model 1282 resistors are used 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. A typical application is the wide range of quality and reliability testing. Regular measurements give a reliable information of the quality level of 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 four-wire measurement principle. The voltage path is equalized to the customized value and to an 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. All power and limiting values of the diagrams overleaf refer to the resistor material MANGANIN®. Unfavourable installation with insufficient possibility of ventilation and cooling have to be taken into consideration accordingly. The potential tap is effected via brass terminals with 4 mm hole. The screw-terminals for the current feed are dimensioned according to the maximum capacity. Technical changes reserved -Latest updates of data sheet always under www.burster.com burster praezisionsmesstechnik gmbh & co kg ■ Tel. +49-7224-6450 ■ Fax 64588 Talstr. 1-5 ■ DE-76593 Gernsbach ■ www.burster.com ■ info@burster.com

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1282 EN - 2 Load limit curve Technical Data Resistance ranges: 1 mΩ ... 100 mΩ, any resistance value within this range is available Resistance tolerance: 0.02 % Calibration temperature: 23 °C Resistance material: MANGANIN® Temperature coefficient: < 10 ppm/K Temperature dependence: Rt = R20 (1 + a20 (t - 20) + b (t - 20)2) a20 = 0 ... 20 . 10-6 b = - 0.59 . 10-6 Long-term stability: < 0.01 % over years Long-term load: 20 W Short-time over load: approx. 90 W < 1 min Ultimate load: 60 W at 25 °C environmental temperature Current limit (at 1 mΩ): 200 A Surface temperature: max. 85 °C, results...

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