Making Ground Connections; 3800Ex Expansion Shelf, Rear View - Symmetricom TSG-3800 Series User Manual

Installing the TSG-3800
TSG-3800 Expansion Shelves
Figure 2-18. 3800EX Expansion Shelf, Rear View

Making Ground Connections

After the TSG-3800X is installed in a rack, the shelf must be connected to a proper
earth ground.
1. Run a cable from the frame ground (J10) lug to earth ground.
Keep this cable as short as possible. Frame ground connections are made using
the #8-32 stud labeled FG/J10 on the lower left corner of the rear panel.
Note: The TSG-3800EX is shipped with a terminal jumper that
connects Frame Ground (FG), which is also called chassis ground, to
Logic Ground (LG), which is also called signal ground. These jumpers
are located in the lower left corner of the rear panel. To isolate these
two grounds, this jumper must be removed. Once the connections to
LG have been opened, secure the jumper to the rear panel by
tightening the FG screw. If desired, the LG terminal may be used to
connect a separate LG cable.
2. Using a digital voltmeter, measure between ground and chassis and verify that
no voltage potential exists between them.
68 TSG-3800 User's Guide
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12778474-002-2 Revision F – March 2004