Eaton MGR10 Operating Manual

Contents

MGR10 A/B/C - Revision : I (for 7.0 software revision) 445.3 Resistance measurementThe MGR10 should be in the measurement [STOP] mode. In this mode the measuring current isswitched off and the current terminals are shorted internally. Connect the measuring leads as describedin section 5.2, before starting the measurement select the current level and mode required as describedin section 4.2WARNING : the maximum measuring current is 10 Amps on the lowest 3 measuring rangesensure that the current level selected will not damage the resistance being measured.Select the range required see 4.1 or auto range.To start the measurement press the [MEAS] button the measured resistance value will be displayed onthe screen.5.4 Resistance measurement with temperature compensationTemperature compensation should be used when measuring the resistance of materials which havea high temperature coefficient. Copper, for example, has a temperature coefficient of 3.80%/K.The value of the resistance measured will therefore vary with the temperature of the copper. Toobtain consistent and meaningful results, the resistance values may be related to a set ambienttemperature, normally 20C.Example: Copper with a temperature coefficient of 3980ppm/k = 0.3980%/kTemperature 20C 25C 30C 35CResistance of Copper 18.000 m 18.358 m 18.716 m 19.075 m% Increase in resistance 0% 1.99% 3.98% 5.97%To measure with the temperature compensation, proceed as in 5.2.4 but in addition connect thetemperature sensor probe to the front panel socket. Select the temperature compensationmeasurement mode as described in 4.4. Alternatively, if the ambient temperature is stable, a manualvalue may be entered, in this case a temperature sensor is not required. The compensated resistancevalue will be displayed in large digits on the MGR10 screen and the measured value will be shownin smaller digits below the main display. The measured or set temperature will also be shown.