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Introduction
9
Safety Considerations
This power supply is a Safety Class I instrument, which means it has a protective earth terminal. This terminal must be
connected to earth ground through a power source equipped with a 4-wire, ground receptacle. Refer to the "Safety
Summary" page at the beginning of this manual for general safety information. Before operation or repair, check the power
supply and review this manual for safety warnings and instructions. Safety warnings for specific procedures are located at
appropriate places in the manual.
Hazardous voltage exist within the power supply chassis, at the output terminals, and at the analog
programming terminals.
Conventions
• In diagrams, the name of a complementary signal is sometimes shown with a bar above the signal mnemonic. In other
diagrams and in the text, complementary signals are shown with an asterisk (*) after the mnemonic (such as PCLR*).
A mnemonic with a bar over it or an asterisk after it represents the same signal.
• In this manual, all Agilent 668xA series supplies are referred to as system supplies.
Electrostatic Discharge
The power supply has components that can be damaged by ESD (electrostatic discharge). Failure to
observe standard, antistatic practices can result in serious degradation of performance, even when an
actual failure does not occur.
When working on the power supply observe all standard, antistatic work practices. These include, but are not limited to:
• working at a static-free station such as a table covered with static-dissipative laminate or with a conductive table mat
(Agilent P/N 9300-0797, or equivalent).
• using a conductive wrist strap, such as Agilent P/N 9300-0969 or 9300-0970.
• grounding all metal equipment at the station to a single common ground.
• connecting low-impedance test equipment to static-sensitive components only when those components have power
applied to them.
• removing power from the power supply before removing or installing printed circuit boards.