Martindale ET4000 / ET4500 Measurements
56
5.8 PE test touch terminal
The TEST key also acts as a PE test touch terminal and tests for voltage between the
operator and the instrument's PE terminal when performing measurements where the
mains supply is connected to the instrument terminals.
If for example the protective earth and phase of the wiring being tested were reversed
the symbol will be displayed and the test prevented. If the TEST key is touched
the red and green LED's at the display sides will flash, an audible alarm will sound and
the symbol will be displayed.
There is however a wiring fault shown in Figure 5.39 that can only be detected by the
PE test touch terminal. For this reason, if the TL180 test probe is being used for testing,
the instruments TEST key should always be touched once the test lead and test probe
are in contact with the wiring being tested before proceeding with any measurements.
Example of the application of PE test terminal
Figure 5.38: PE and Neutral at phase potential and Live earthed
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