Agilent Technologies 3458A Repair Manual

32 Chapter 3 Disassembly/Assembly Procedures and Parts List
• Only one common ground should be provided at the workstation.
• The workstation should be kept free of nonconductors. No common
plastics, polybags, cardboard, cigarette or candy wrappers should be
allowed. There should not be rugs or carpet on the floor, shelving, or
bench top.
• Only proper containers should be used for shipping, storing or
transporting assemblies. This is required on any assembly shipped to
Agilent Technologies for repair or replacement.
Clean Handling
Due to the accuracy of the 3458A, use the following clean handling
techniques when removing/installing printed circuit board assemblies.
• Handle the assemblies only by their edges.
• Be sure to place them on a clean workbench away from dirty or dusty
conditions.
Printed Circuit Assembly Identification
The printed circuit assemblies within the 3458A Multimeter are identified
by the part number of the printed circuit board and the engineering revision
code (ERC). These two sequences of numbers are used to exactly identify
the electrical characteristics of the printed circuit board. In any
correspondence concerning a particular printed circuit board, it is important
to accurately identify the board configuration. This is done by using the
board part number, followed by the engineering revision code (ERC) on the
board. For example:
03458-66505-2825
would identify a particular printed circuit board in the 3458A. The board
part number is 03458-66505 and the ERC is 2825.
Board Part Number The Agilent Technologies part number of a printed circuit board is etched
on the board. This is a ten-digit number, separated by a hyphen into two
groups of five digits. The first five digits identify the model number or
accessory number of which the printed circuit board is a part. The last five
digits are a unique part number identifying the printed circuit board.
Engineering Revision
Code
On the Engineering Revision Code (ERC) label, the four-digit code is in the
form of YYWW, where YY represents the last two digits of the year minus
60 and WW is the week code. For example, an Engineering Revision Code
of 2825 would identify a change made in the 25th week of 1988.
The ERC number is updated whenever a change is made to the assembly.
This change may be a printed circuit board revision, a component change, or

Agilent Technologies 3458A Specifications

General

Brand	Agilent Technologies
Model	3458A
Category	Multimeter
Language	English