Thanks, Charles.
The board should have a part number etched in copper, of the form
"0xxxx-yyyyy". "xxxx" should be the instrument model number.
08770-yyyyy is etched in copper => 8770A Arbitrary Waveform Synthesizer.
8770A spec: REFERENCE OSCILLATOT (10 MHz Quartz) Aging rate < 5 x
10^^-10/day
Makes sense.
Ulli
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