Megger 1012-280, User Manual

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Introduction
www.megger.com DLRO2 and DLRO2X 7
1. Introduction
This user guide details the operational and functional details of the Megger DLRO2 and DLRO2X
Ducter Low Resistance Ohmmeter 2 A. Please read this user guide fully before attempting to use the DLRO2 units.
1.1 Product Description
The DLRO2 range are tough and truly hand held 2 A low resistance ohmmeters, designed to provide fast, accurate
and repeatable measurements even in electrically noisy environments.
The DLRO2 range have been designed for ease of use, they can be operated by non-technical users with
minimal training.
DLRO2 DLRO2X
There are three main measurement modes: There are four main measurement modes:
„
Normal resistance (µΩ)
„
Normal resistance (µΩ)
„
Fast / long test lead (mΩ)
„
Fast / long test lead (mΩ)
„ Inductive resistance (µΩ) „ Inductive resistance (µΩ)
„ Noise rejection mode (mΩ)
The DLRO2 units are supplied with six HR6 rechargeable NiMH cells which can be charged in the instrument using
the supplied external power supply. Non-rechargeable Alkaline AA cells can also be used.
For personal safety and to get the maximum benefit from this instrument, make sure that the safety warnings and
instructions are read and understood before the instrument is used.
Refer to 2. Safety Warnings on page 10
NOTE :
This user guide includes instructions for all DLRO2 variants. Some facilities may not be available on your
model of this equipment.
1.2 Features
„ Noise rejection mode (DLRO2X only). Refer to 9. Tests: Noise rejection mode (DLRO2X) on page 37
„
Data and results storage option (DLRO2X only). Refer to 5. Data storage (DLRO2X only) on page 22
„ ‘Difference Meter’ for quick comparison of results. Refer to 3.6 The Difference Meter on page 17
„
Rotary dial test function selection.
„ Unidirectional or bidirectional test options on normal resistance test mode.
„
Secondary display field showing either forward and reverse measurement results or previous two test results,
allowing three test results to be on display at any time for easy comparison.
„ Current reversal capability to cancel standing EMF.
„
Noisy connection warning, showing when electrical noise or noise from poor clip / probe connections is present.
„ Test currents selectable from 1 mA to 2 A
„ Capable of 500 measurements from a single charge.
„ Supplied with compact CAT III 600 V / CAT IV 300 V rated kelvin clip test leads.
1.3 Difference Meter
The Difference Meter allows repetitive measurements to be easily compared with an initial reference measurement.
The Difference Meter translates percentage difference to a needle / pointer movement making it easy to see changes
in value.
A new reference measurement can be set at any time at the push of a button.
Refer to 3.6 The Difference Meter on page 17