1 General Information
24 Keysight 3458A Assembly-Level Repair Manual
Instrument Identification
Keysight instruments are identified by a two part, ten-digit serial number. The
serial number is located on the instrument's rear panel between the rear terminals
and fan filter. The number is in the form 0000A00000. The first four digits, called
the serial number prefix, is the same for all identical instruments. It changes only
when a change is made to the instrument. The letter indicates the country of
origin (A indicates the instrument was built in the United States of America). The
last five digits, called the serial number suffix, are unique for each instrument.
Be sure to include the entire serial number, both prefix and suffix, in any
correspondence about your instrument.
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