Instrument Controls www.megger.comDLRO2 and DLRO2X173.6 The Difference MeterThe Difference Meter is a feature on the DLRO2 / DLRO2X that is displayed at the top of the primary screen (marked ‘1’ on the diagram). The Difference Meter works in inductive and resistive modes only. It can be toggled off and on in the instrument settings, giving space for other characters in the primary field to be displayed in a larger format making them easier to read, if required. Refer to 9.1 General Settings on page 28.Repetitive measurements can be easily compared with an initial reference measurement. The Difference Meter translates percentage difference to a needle / pointer movement making it very easy to see change. The green marker shows the initial or reference reading. Noisy results are shown with a red marker. Good results are shown with a blue marker. When testing, pressing the TICK button () sets the latest reading as the reference reading and cancels all other readings recorded on display, including those on the Difference Meter and the secondary field.32145ItemDescriptionItemDescription1Difference Meter4Blue result marker shows that noise is not present. Open circle for latest result / solid circle for previous result2Red result marker shows that noise is present. Open circle for latest result / solid circle for previous result5Latest measurement showing percentage difference compared to initial reference measurement-7%3Reference measurement, greenNOTE : All markers are positioned in chronological order. The most recent is positioned high on the Difference Meter line, the oldest is positioned lowest.3.7 Difference Meter example of operationThis explanation of the Difference Meter is written in reference to resistance mode but the explanation applies equally to inductive mode.Resistance measurement is selected. The Difference Meter is inactive. Continuity is indicated for C and P leads
