Boonton PIM 31 User Manual - Manual (Page 11)

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2.3 POWER REQUIREMENTS
The PIM 31 Series is equipped with a switching power supply that provides
automatic operation from a 90 to 260 volt, 47 to 63 Hz, single-phase, AC power
source. Maximum power consumption is 750W / 750 VA
For bench-top use, choose a clear, uncluttered area. For field use,
choose a dust free environment. Ensure that there is at least 2" of
clearance at the fan air intake on the front panel and bottom vents,
and the exhaust vents on the back panels to allow for proper air
circulation.
Before powering the unit up make sure the instrument does not
show indications of exposure to extensive force like dents, torn off
pieces or loose parts in the case.
Caution