General Description - Megger DLRO-10 Guide De L'utilisateur

GENERAL DESCRIPTION

The DUCTER DLRO 10 and DUCTER DLRO 10X make up a family of low resistance ohmmeters that measure resistances in the range from 0.1 µΩ to 2 kΩ.
Both instruments provide a maximum test current of 10 Amps d.c. which is automatically selected according to the value of resistance being tested. The
DLRO 10X allows you to override this automatic selection and select your own test current.
The measured value of resistance is output to the instrument display with indication of the units, µΩ, mΩ or Ω. The DLRO 10 uses a large LED display and
indicators to display the value and units respectively, while the DLRO 10X contains all the information on a clear backlit LCD display.
The use of a four terminal measurement technique removes the test lead resistance from the measured value and auto current reversal eliminates the
effect of standing voltages across the test sample. Additionally, before and during a test, test lead contact is monitored to further reduce the chance of
erroneous readings.
A resistance measurement takes approximately 2.5 seconds and comprises a measurement with forward current, reverse current and a display of the
average. On the DLRO 10X all three values are displayed, and optionally, the measurement may be limited to forward current only.
The instrument is powered by a rechargeable Nickel Metal Hydride (NiMH) battery, which permits one thousand 10 Amp tests to be completed on a
single charge. The battery module contains intelligent circuitry, which prevents damage to the battery from overcharging, and a battery state indicator. A
removable lid that is hinged at the back and held closed by magnetic catches covers the top panel. This lid may be removed if required by opening fully
and snapping out of its hinges.
Both instruments are protected against accidental connection to external voltages up to 600 V d.c. applied between any pair of the four terminals for up to
10 seconds. Please note that applying 600 V to the potential terminals will cause some internal heating. Expect errors of up to 30 digits immediately after
the application of such voltage. Full accuracy will be restored within two to three minutes. Both instruments are supplied complete with a pair of DH4
Duplex Handspikes with 1.2 m leads. Other lengths and terminations are available if required.
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