The Megger DLRO200-115 Digital Low Resistance Ohmmeter is an a.c. powered low resistance ohmmeter designed to measure d.c. resistances in the low milliohms or microhms using a maximum test current of 200 Amps d.c. The maximum test current available is dependent upon the power supply, the resistance of the test leads and the resistance of the item being tested.
Megger DLRO200-115 Digital Low Resistance Ohmmeter principle of operation
The required current is set before the test starts. When the TEST button is pressed, after a short delay the current increases to the set current, the voltage detected across the “P” leads is measured, and the current then reduces to zero.
Operation is controlled using the two-axis paddle and the menu system, which appears on the backlit liquid crystal display. The keyboard is used to set the desired test current and to add notes, which may be stored with test results in on board memory for later download via the RS232 socket provided. The measured resistance, the actual test current and measured voltage are clearly presented on the display after the test is complete.