Hi,
I have an HP 5334A frequency counter and I want to install a 10MHz oven quartz oscillator to improve the accuracy. Although it¡¯s not hard to find the oscillator, getting the support PCB is proving tricky. So I thought I would make one as it¡¯s not a complex circuit or layout. Spacing of mounting holes etc is a bit more tricky - ?but I mocked up a prototype with cardboard to get rough sizing etc.
My question is about circuit grounds. The circuit (attached) has several separate supply grounds and my question is about the note 3 regarding ¡°instrument common¡± and ¡°digital circuit return¡±. They are distinguished on the schematic but appear to be connected on the PCB (see attached pic). For example C1 and C2 are clearly connected to edge connector pin 4 although they are different ¡°grounds¡± according to the note.
could anybody advise me on what the best thing to do here is please? Are they the same?
thanks
Tonys
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