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1780R-Series Service Manual
Installation Requirements
The 1780R-Series is designed for efficient use of rack space. It can be mounted
flush with other equipment, eliminating the need for air circulation above and
below the cabinet. It should not be mounted flush with equipment that is a
significant heat source, because heat conducted through the cabinet can raise the
internal temperature of the instrument beyond its ability to cool itself.
Cooling air for the 1780R-Series is pulled into the instrument through a
rear-panel fan and exhausted through the cabinet sides. Most equipment racks
provide enough space, along side the instruments, to allow heated air to escape
from this instrument.
Before installing the instrument in the rack, be sure that the cooling fan blades
are un-obstructed and turn freely.
A minimum rear panel clearance of 1-1/2 inches is required to connect BNC
cables.
Front-panel clearance of at least 20 inches is required to remove the instrument
from its rack mounting cabinet.
Electrical Installation
This instrument is designed to operate from a single-phase power source having
one of its current-carrying conductors at or near earth-ground (the neutral
conductor). Only the Line conductor is fused for over-current protection.
Systems that have both current-carrying conductors live with respect to ground
(such as phase-to-phase in multiphase systems) are not recommended as power
sources.
The 1780R-Series operates over a frequency range of 48 to 64 Hz, and at a
nominal mains voltage of 115 VAC or 230 VAC. The factory setting, 115 V or
230 V, is marked on the rear-panel mains switch. See Figure 2–2. Be sure the
instrument is operated with the selected mains voltage.
Power Source
Mains Frequency and
Voltage Ranges