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Addendum
This manual is for the EW604 and EW1604 Electronic Wattmeter. The EW1604 design
includes a higher degree of immunity to radiated radio frequency fields in order to comply
with the EMC Directive. In all other respects the specification and operating instructions
for the EW604 and EW1604 are the same. The only other difference is that the protective
fuse in the input lines (not the mains fuse) has been moved from the rear to the front
panel.