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3
Maintenance
The serial number is divided into two parts: the prefix (two letters and the first four
numbers) and the suffix (the last four numbers).
– The prefix letters indicate the country of manufacture. This code is based on
– The suffix indicates an alphanumeric code which is used to ensure unique
SER
OPT
Figure 3-11
Recommended calibration interval
Keysight recommends a one-year calibration cycle for the 8990B.
196
the ISO international country code standard, and is used to designate the
specific country of manufacture for the individual product. The same product
number could be manufactured in two different countries. In this case, the
individual product serial numbers would reflect different country of
manufacture codes. The prefix also consists of four numbers. This is a code
identifying the date of the last major design change.
identification of each product throughout Keysight.
SERIAL
MY12345678
Keysight
MADE IN MALAYSIA
Serial number
NUMBER
Keysight 8990B User's Guide
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