Hi - Does anyone know if there ever existed a service manual for the HP 10544A crystal oscillator? I know that there is a manual for the 10811 and this osc is very similar to the 10544, but I would like a copy of the service manual if it exists.
Does anyone have any insight to this? Thanks Jim WB5KYE
The manual covers HP 10811A, 10811B, 10811-60101, 10811-60105 quartz crystal oscillators. It seems that all of them have the same circuitry, and that 10811B has a different case and connections. 10811A, 10811-60101 and 10811-60105 are closely similar but the specs are slightly different (phase noise not specified for 10811-60101, and the 10811-60105 being a 10811-60101 a bit less stable). Anyway, to quote the manual, 10811-60101 and
10811-60105 ARE PHYSICALLY IDENTICAL to 10811A. I own two 10811-60111, not mentioned in the manual, and I think they are the same as 10811A but with some different specs. Anyway I know that the 10811-60111 has the same stability as 10811A, according to the specs of the apparatus it is mounted on.
The file names are self explanatory: as an example, for the 10811 the file name is 10811-90002.pdf, where 90002 might be a date code. Look at the first groups of digits in the filenames.
Yes indeed. I didn't know that site until yesterday when I'we been pointed to it by the BAMA website (
formatting link
).
Regards, Antonio, ham radio operator I8IOV in Italy.
The -xxxxx (-90002 in this case) is not a data code. HP part numbers, for parts common to many instruments/products, are xxxx-xxxx -- and commonly known as "4 by 4" part numbers. Part numbers specific to a product or a small product family are "5 by 5" numbers, the first five digits being the product family number (such as 10811), and the last five follow a convention: those beginning with 9 are manuals and similar documentation. PC assemblies would have different 5 by 5 numbers. You'll find examples of these numbers in the 10811-90002 manual, both 4 by 4 and 5 by 5, and you can get an idea that the first
4 digits of the 4 by 4's represent a type of part...
Thanks to all... I actually have an original 10811 service manual. I was hoping to finding the 10544 service manual (if it even exists). I do have a copy of the schematic for the 10544, so I'm good there. Thanks again.. Jim
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