An unfortunate downside to using internal protection fuses is that
the PAT4 can be rendered inoperative simply by the failure of
such a fuse resulting in frustration and delay for the user. In order
to ensure that the instrument can quickly be put back into service
without downgrading its protection externally located fuses are
now fitted to all new PAT4 models. These may be changed
quickly and simply by the user in the event of a failure. For
maximum convenience all fuses are of the same value.
Additionally the PAT4 display will now indicate which fuse has
failed, unless of course it is main supply fuse in which case the
screen will be blank.
Replacement of Fuses
Always disconnect the PAT4 from the main supply before
checking fuses. Use correct replacement fuses as printed
adjacent to the fuse
Megger Part No. for replacement fuses 25950-014
Using your PAT4
Connecting to the Power supply
Plug the
PAT4 into a standard 230 V supply for testing 230V
appliances or into a 110V supply for testing 110V appliances. A
110V ‘site’ or ‘tool’ transformer may be used.
On connecting to the supply, the
PAT4 performs a rapid self-test
and calibration sequence. If the screen is dim, refer to Contrast
adjust.
* For 230 V 60Hz operation see note on Earth Leakage, page 45
5
Fuses
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