Re: How do you decipher HP serial numbers for date.
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On Thu, Sep 1, 2022, 05:54 Mikek < amdx@...> wrote: I recently bought an HP 3400A, and want to get a build date and also find the proper schematic for repair.
?Is there a site that tells how to decipher the serial number?
For most HP instruments (pre 2000), the serial number doesn't tell you the build date. The first four digits are YY and WW, where YY is the number of years since 1960 and WW is the week. However, that's not when it was built; that's the production series. During production they only updated the YYWW when there was a significant production change, requiring updated information or procedures in the service manual.
Corvallis Division (calculators) and some 1980s+ computer stuff are exceptions, where due to high production volume, they actually update YYWW every week rather than only in changes. AFAIK, that was not done on any HP instruments during the lifetime of that serial number scheme. With Agilent and Keysight things changed.
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