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Installation 2
Series N6700 User’s Guide 23
Bench Installation
Do not block the air intake and exhaust at the sides, or the exhaust
at the rear of the unit. Refer to the outline diagram in Appendix A.
Minimum clearances for bench operation are 2 inches (51 mm) along
the sides and back.
Channel Number
The channel number of a power module is determined by the location
of that module in the mainframe. When viewed from the rear, the
module next to the GPIB connector is always output channel one.
Numbering continues sequentially to the left, from one to four.
If there are less than four modules, channel numbering corresponds
to the actual number of installed power modules. Unused channel
slots must contain filler modules to ensure proper airflow for cooling.
Double-wide power modules are assigned the channel number of the
lowest numbered slot in which is installed. For example, if a double-
wide module is installed in slots 3 and 4, it is assigned channel
number 3.
NOTE
Power modules that are connected in parallel and have been configured or
grouped to act as a single, higher-power channel are addressed using the
channel number of the lowest channel in the group.
400 Hz Operation
Redundant Ground Requirement
At 400 Hz AC input operation, the leakage current of the unit exceeds
3.5 mA. This requires the installation of a permanent, redundant
ground from the instrument chassis to earth ground. This ensures
that ground will always be connected and that any leakage current
will be diverted to ground. Refer to the Service Guide for installation
instructions.
Power Factor
At 400 Hz AC input operation, the unit’s power factor is affected as
follows:
Under full load at 400 Hz, power factor drops from 0.99 (@120
VAC) to as low as 0.76 (@ 265 VAC).
Power factor degrades further under no load conditions.
Cleaning
WARNING
SHOCK HAZARD To prevent electric shock, unplug the unit before cleaning.
Use a dry cloth or one slightly dampened with water to clean the
external case parts. Do not attempt to clean internally.