2
G
Safety Warnings
These safety warnings must be read and understood before the instrument is used.
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 optional Megger
terminal cover (part number 1002-390) must be used. See the accessories section of this user guide.
Testing inductive circuits can be hazardous:
After testing an inductive load there will be an amount of energy stored in the inductance. This 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.
Although the DLRO10HD is not designed as transformer ohmmeter, it is fitted with a test in progress lamp associated with the TEST button, which indicates
that current is flowing in the C1-C2 loop. This lamp and a warning triangle on the LCD will flash at end of a test on an inductive load whilst a discharge
current is still flowing and will stop flashing when the current has decayed to less than 1 mA.
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. When testing an inductive load using the connector test leads the L1
lamp on the lit connector 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 instrument or connect it to any external system if it shows any visible signs of damage or if it has been stored for
prolonged periods in unfavourable conditions.
CAT II
-
Measurement category II: Equipment
connected between the electrical outlets and
the user’s equipment.
CAT III
-
Measurement category III:
Equipment connected between the
distribution panel and the electrical outlets.
CAT IV
-
Measurement category IV:
Equipment connected between the origin
of the low-voltage mains supply and the
distribution panel.
