Keysight 669 A Series, Service Manual

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Introduction
8
Firmware Revisions
The power supply's firmware resides in the A10 control board microprocessor chip and in ROM chips on the A2 GPIB and
A1 Front Panel boards. You can obtain the firmware revision number by either reading the integrated circuit label, or query
the power supply using the GPIB *IDN query command (see Chapter 3 - Troubleshooting). Also, see Chapter 3, Firmware
Revisions for the actual Keysight BASIC program that does this.
Related Documents
Operating and Programming Manuals
Each power supply is shipped with an operating and programming manual (see Replaceable Parts, Chapter 5 for part
numbers) that covers the following topics:

Options, accessories, specifications, supplementary characteristics, output characteristic curve, typical output
impedance curves.

Connecting the power cord, load, and remote sensing.

Connecting power supplies in series or autoparallel.

Connecting the remote controller and setting the GPIB address.

Configuring the digital port for remote inhibit, relay link, or digital I/O operation.

Connecting the analog port for external voltage programming control.

Turn-on tests, including selftest errors and runtime errors.

Front panel operation.

SCPI programming, an introduction to syntax, language dictionary, and status register operation.

Compatibility-language programming for operation with Keysight Series 603xA power supplies.

Replacement of line fuse and conversion of line voltage.

Calibration procedure (front panel and remote).
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.
Electrostatic Discharge Precautions
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
(Keysight P/N 9300-0797, or equivalent).

using a conductive wrist strap, such as Keysight 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.