Insulation Tests
18
Class 1 (earthed) appliances
Plug EUT into Analyser outlet socket, connect the Earth Bond lead to the appliance metal part.
Class 2 (unearthed) appliances
This test cannot be performed as there is no earth connection to exposed conductive parts of the EUT.
Pressing the Start button in this instance will not initiate the test.
If a different test current is required, press SELECT, which will cause the selected test current to flash, and use
the arrow keys to select the appropriate current as desired.
This test is to ensure that the connection between the earth pin in the mains plug of the appliance and the metal
casing of the appliance is satisfactory and of sufficiently low resistance.
The test current is applied between the earth pin of the mains supply plug and the earth bond test lead
clip/probe.
A high current is normally used to stress the connection under fault conditions. The length of the test should be
limited to prevent damage due to overheating. Tests currents of 1A, 10A and 25A AC are available.
Caution
Prolonged use of the earth bond probe at high currents can lead to a high probe temperature. Care
should be taken to avoid touching the probe tip under these conditions. The Analyser’s internal over
temperature switch may operate with prolonged repetitive use of high test currents. In this instance an
error message will be displayed. In order to proceed with further tests the Analyser must be allowed to
cool down.
Insulation Tests
Switch Position
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INSUL
Test Icon Displayed ---
Warning
500V d.c. test voltage
Class 1 (earthed) appliances
Plug EUT into Analyser outlet socket
Class 2 (unearthed) appliances
Plug EUT into Analyser outlet socket, connect Earth Bond lead socket to the appliance.
