Disassembly/Assembly Procedures and Parts List 3
Keysight 3458A Assembly-Level Repair Manual 61
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 Keysight 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 a revised
test and assembly procedure. The ERC should be checked against schematics,
component locator diagrams, and parts lists to ensure compatibility. ERCs with
values lower than those noted on the schematics, component locator diagrams,
and parts lists are described in a backdating section. ERCs with a value higher
that those noted will be covered by a manual change sheet, manual update, or
manual revisions.
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