Introduction
8
Manual Revisions
Agilent Technologies instruments are identified by a ten-character, serial number, such as, US36360101. This manual was
written for power supplies with serial numbers equal to, or higher than, those shown on the title page.
If the serial number on the rear panel of your power supply is higher than the one on the title page, then the power supply
was made after publication of this manual, and may have hardware and/or firmware differences not covered in this manual.
If there are such differences, they are documented in one or more yellow “Manual Changes” sheets sent with the manual.
If the serial number of your power supply is below that listed on the title page, or if it uses an older serial number format
such as 3023A-01456, then your power supply was made prior to those covered in this manual. If this is the case, refer to
Appendix A for any backdating information that may apply.
Safety Considerations
This product is a Safety Class 1 instrument that has a protective earth terminal. Refer to the Safety Summary page at the
beginning of this manual for general safety procedures and for the meaning of safety symbols appearing in the manual and
on the power supply.
Hazardous voltages exist within the power supply chassis, at the output terminals, and at the programming
terminals.
Firmware Revisions
The supply's firmware resides in the front panel board's ROM chip (A3U4), and in the main board's microprocessor chip
(AlU504). For models 664xA and 665xA, firmware also resides in the GPIB board ROM chip (A2U106).
For GPIB models 664xA and 665xA, you can use the “*IDN?” query, as described in Chapter 3, to get the firmware
revision numbers of your power supply's firmware. For Agilent models 654xA and 655xA, the revision number can be read
from the label affixed atop the IC chip.
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 if complete
failure does not occur.
When working on the power supply, observe all standard antistatic work practices. This includes, but is not limited to:
■ Working at a static-free station, such as, a table covered with static-dissipative laminate or with an Agilent 9300-0797
conductive table mat.
■ Using a conductive wrist strap, such as, an Agilent 9300-0969 or an Agilent 9300-0970 wrist strap.
■ 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.
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