Philips PM6667 High Resolution Counter 10Hz 120MHz 1981 test teardown

wow this is a great frequency counter from 1981, and it really works, is spot on accurate too, link to full doc :

#philips
#test
#teardown
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[SeanBZA]

Even show you how the options work, like internal battery or internal high stability oscillator as well. Back socket is a standard thing, allowing external 10MHz reference to be fed in direct, just flip a jumper to enable it.