Chapter 2 35
Agilent 4072/4073 Preinstallation Guide, Edition 4
Site Preparation
Emergency Off (EMO) System
Emergency Off (EMO) System
The system cabinet is equipped with an emergency off (EMO) unit. When you press the EMO switch, the main
contactor and emergency breaker in the power distribution unit (PDU) of the system cabinet opens and stops
supplying electrical power to the system components.
The EMO unit can also receive an emergency signal from another instrument or system, and can stop supplying
electric power to the system components. In addition, it can transfer an emergency signal to any other instruments
or systems.
If you configure the EMO system with a 4072/4073 tester, you must understand the EMO unit before connecting it
to other systems. Included are:
• Circuit diagram and its operation for the EMO switch and power distribution unit.
• I/O interface (external in/out terminals) specifications for the PDU.
• Example design for an external emergency lamp.
The 4072/4073 tester with a system cabinet has an emergency off (EMO) switch at the top of the cabinet, as shown
in Figure 2-17. The emergency off switch is a red, circular push-switch labeled “EMO.” Pushing the EMO switch
stops the power to the system instruments. After the EMO switch is pushed, the switch is locked in the pushed
condition. To release the locked EMO switch, turn the switch clockwise.
Figure 2-17 Emergency off (EMO) switch on system cabinet
Emergency off
(EMO) switch
LINE indicator
INSTRUMENT
POWER switches
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