Preparing for Operation
Connecting to Line Power
2
2-5
2-5. Connecting to Line Power
Warning
To avoid shock hazard, connect the factory supplied three-
conductor line power cord to a properly grounded power outlet.
Do not use a two-conductor adapter or extension cord; this will
break the protective ground connection.
Use the rear-panel CHASSIS GROUND terminal for a protective
grounding wire if there is any question about the effectiveness
of instrument earth grounding through the line power cord
ground wire.
The calibrator is shipped with the appropriate line power plug for the country of
purchase. If you need a different type, refer to Table 2-2 and Figure 2-2 for a list and
illustration of the line power plug types available from Fluke.
After you verify that the line voltage selection is set correctly and that the correct fuse
for that line voltage is installed, connect the calibrator to a properly grounded three-
prong outlet.
2-6. Selecting Line Frequency
The calibrator is shipped from the factory for nominal operation at 60 Hz line frequency.
For calibrators with Main software version 1.9 or greater, and if you are using 50 Hz line
voltage, you should re-configure the 5520A for optimal performance at 50 Hz. To do so,
from the front panel, go into SETUP, INSTMT SETUP, OTHER SETUP, and then turn
MAINS50H to “on”. Store the change. After the instrument is properly warmed up (on
for 30 minutes or longer), you must re-zero the complete instrument. For details, see the
section on “Zeroing the Calibrator” in Chapter 4.
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