The Megger BT51 Milliohmmeter takes measurements by passing a current through two terminals on the conductor as well as monitoring the voltage across it. This measurement is ratiometric, meaning it is unaffected by current variations. The BT51 uses the four-terminal method of measurement. The main advantage of this method is that the resistance of the test leads is not included in the measurement, which is important when the resistance is very low.
This meter has a 3 1/2 digit LED display to facilitate use in low light levels. Two LEDs on the front panel indicate battery condition and whether test current is flowing when a measurement is being made. A red warning light indicates the presence of a dangerous voltage if the test leads are accidentally placed across a live circuit. This warning takes place whether or not the instrument has been switched on.
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