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400 Hz Option
The HP 70001A Mainframe is available with an option that allows it to operate on a power-line
frequency of 400 Hz. The 400 Hz option comes with an external in-line 600 V-A isolation
transformer that must be used when the instrument uses a 400 Hz power source.
WARNING
Never operate a 400 Hz option instrument on a 400 Hz power line without
using the in-line isolation transformer supplied for this purpose. Failure
to follow this precaution can create a shock hazard which may result in
personal injury.
The in-line isolation transformer must be removed from the 400 Hz option for 50/60 Hz power
source operation. Failure to remove the in-line 400 Hz transformer will result in the 400 Hz
transformer input fuse. When the isolation transformer is removed, a standard power cord
must be used. The in-line transformer must be reinstalled when using a 400 Hz power source,
in order to protect the user from electric shock hazard.
Fuse Replacement
The line fuse for this instrument is located inside the power cord receptacle housing on the
back of the instrument. Also included in this housing is a spare fuse. The fuse is a 5 by 20 mm
fuse rated at 6.3 A, 250 V, HP part number 2110-0703. Refer to Figure 2-2 for fuse removal
and replacement.
Figure 2-2. Line Fuse Removal and Replacement
Installation 2-3
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