Safety Warnings - Megger DLRO10 Manual De Instrucciones

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SAFETY WARNINGS
This document provides important safety information. Keep with the accessories,
DO NOT DISCARD !
These safety warnings must be read and understood before the instrument is used.
Always refer to the user manual of the instrument being used with these test leads.
Do not touch the universal connector during test or while connected to hazardous voltages.
Whenever possible, circuits should be de-energised before testing.
If it is impossible to de-energise the circuit, (e.g. high voltage batteries cannot be switched off while
their connections are tested) the user must be aware of the dangers. The instrument terminals will
become live when connected to the circuit. Therefore when used on hazardous voltages the Megger
terminal cover (available separately) must be used. See the accessories section of this user guide.
When running any test, or when attached to a test load, do not undo the modular connections.
Isolate both test leads before changing any part of the modular leadset.
These test leads on their own not safety CAT rated due to the bare hook terminations. However
when fitted with insulating instrument terminal covers and a suitably rated test termination the overall
safety CAT rating will be the lowest of the ratings between the instrument, the terminal covers and
the test termination.
For example if used with a DLRO10HD fitted with terminal cover part number 1002-390 and a pair of
DP1-C duplex probes the safety rating of the complete system will be CAT 300 V. However if the test
terminations were changed to KC1-C kelvin clips the safety rating would drop to <30 V as the KC1-C
are un-rated.
Testing inductive circuits can be hazardous:
After testing an inductive load there will be an amount of energy stored in the inductance. This
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energy is released in the form of a discharge current. Disconnecting an inductive load while
current is still flowing will cause a high voltage arc, which is a danger to both the user and the
item under test
The DLRO connector lit lead sets are fitted with a 'test in progress lamp' associated with
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the TEST button which indicates that current is flowing in the C1-C2 loop. For testing large
inductive resistances the current carrying leads should be connected securely to the item
under test before starting the test
It is not recommended that duplex handspikes be used to carry out tests on inductive loads.
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If inadvertently using the handspikes on an inductive load, the L1 lamp on the handspikes will
flash amber while discharge current flows, thereby duplicating the function of the 'I' lamp on
the instrument. It is important to maintain contact until the L1 light stops flashing amber and
turns green indicating the end of the test
This product is not intrinsically safe. Do not use in an explosive atmosphere.
Do not operate the test leads or connect to any external system if any visible signs of damage are
apparent or if they have been stored for prolonged periods in unfavourable conditions.
Inspection
Before each use of the test leads, perform a thorough visual inspection to confirm that their condition
is good, with no damaged or broken insulation.
The Measurement Category rating of the measurement system is that of the lowest rated component.
If any part of the measurement leads is unrated, the instrument is safe for connection only up to
30 V."
CAT ratings:
CAT IV: Measurement category IV: Equipment connected between the origin of the low-voltage
mains supply and the distribution panel.
CAT III: Measurement category III: Equipment connected between the distribution panel and the
electrical outlets.
CAT II: Measurement category II: Equipment connected between the electrical outlets and the user's
equipment. Measurement equipment may be safely connected to circuits at the marked rating or
lower.
User Guide
Duplex connector test lead system for use with 10 A DLRO and BT51 instruments
The Megger DLRO duplex connector four terminal test lead system is designed to provide the most
cost effective and convenient way to provide the user with all off the test lead terminations and lead
lengths required for the many different applications encountered in low resistance testing.
At the centre of this unique test lead system is a bespoke connector allowing terminations such as
kelvin clips or duplex test probes to be changed as required. There are two connector versions, one
being fitted with indicator LEDs that operate with the DLRO10 range of instruments. The indicator
LEDs provide enhanced safety and convenience with indications as follows:-
DLRO10, DLRO10X, DLRO10HD and DLRO10HDX
Warning of connection to hazardous live voltage
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(Not DLRO10X, warning is given on the display)
When continuity is made
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When a test complete and measurement is on instrument display
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DLRO10X adds
Indication of pass / fail to user set test limits
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All of these important indications are therefore seen near the point of connection without needing to
view the instrument display. There is even a 6m extension lead to provide the ultimate in flexibility.