General Operation - Dlro 10; Test Current Indicators; Noise Lamp; C' & 'P' Indicators - Megger DLRO-10 Guide De L'utilisateur

GENERAL OPERATION - DLRO 10

Press the On/Off switch to turn DLRO 10 on. All lamps will light, V and
I lamps will flash, the software version will be displayed and the Ω lamp
will light. If the test leads have not been connected to the test sample the
'C' and 'P' lamps will also light. Press the On/Off button again to turn the
instrument off. If the instrument is not used for 5 minutes it will be turned
off automatically.
Adjust the brightness control to a comfortable level.
Select the Test mode by pressing the Mode button repeatedly. The
indicator lamps will cycle through the various Test modes in turn (see the
section on Test modes). Press the Test button to start a test.

Test Current Indicators

The test current is selected automatically by DLRO 10 and is indicated by
the lamps on the left of the panel. The measured value is displayed in the
main window and the units (µΩ, mΩ or Ω) are shown by the lamps to the
right of the window.

Noise Lamp

Noise in excess of 100 mV 50/60 Hz will light the 'Noise' lamp and
measurement accuracy cannot be relied upon.
'C' & 'P' Indicators
The 'C' lamp illuminates to indicate contact failure in the 'C1-C2' loop. The
'P' lamp illuminates when there is a break in the P1-P2 loop.
'V' & 'I' Warning Indicators
If external voltage is applied to the terminals the 'V' lamp will flash. This is
a warning that the item under test is live and might be dangerous. A test
cannot be performed in this condition.
The 'V' lamp will light if more than 50 V. is applied between either voltage
terminal and a current terminal. If the voltage appears between just the
voltage terminals or just the current terminals the lamp will light at 100 V
peak or 5 V peak respectively.
Please note - The 'V' lamp will only indicate if a voltage appears
between terminals. The lamp will not operate if all terminals
are at the same high voltage. The lamp will not operate if the
instrument is turned off.
The 'I' lamp will light if a current greater than 1 mA is still flowing after a
test is completed. This suggests that an inductive load has been tested and
is still discharging. Do not disconnect the current loop until the 'I' lamp
has gone out.
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