Redundant Ground for 400 Hz Operation
SHOCK HAZARD. FAN HAZARD. Only qualified, service-trained personnel who are
aware of the hazards involved should remove instrument covers. Disconnect the
power cable and any external circuits before removing instrument covers.
Operation at 400 Hz requires the installation of a redundant ground from the instrument chassis to
earth ground. The redundant ground must be permanently attached to the unit as well as to the earth
ground point.
The following procedure only describes how to make the permanent connection at the unit. The user
must ensure the integrity and permanence of the connection at the earth ground point.
The following customer-supplied hardware is required:
l Ground wire (14/16 AWG)
l Uninsulated ring terminal for attaching wire to unit (Tyco p/n 34124 or equivalent)
l Hardware for attaching ground wire to earth ground point
The following tools are required for installing the redundant ground:
l 3/8 inch hex wrench
Installation Procedure (see figure)
Step 1. Remove the blower and interface covers. Refer to Accessing the Calibration Switch.
Step 2. Use the wrench and remove the rear panel binding post (1) from the chassis.
Step 3. Crimp the appropriate ring terminal (2) onto the end of the ground wire.
Step 4. Place the ring terminal onto the threaded end of the binding post. Re-install the binding post
on the chassis with the washer and nut (3).
Step 5. Rotate the ring terminal so that the ground wire does not interfere with any other connectors
on the back of the unit. Use the wrench to tighten the binding post (Torque = 20 – 25 in-lb.).
Keysight N6700C Operating and Service Guide 409
7 Service and Maintenance
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