Products > Test Equipment
DF3380 Frequency Counter
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PinheadBE:
Yes, there is a prescaler.   I meant "No, it's probably not available anymore"

It's a 8-pin DIP chip with markings erased, but it seems the reference ends with "...40".  (See picture)

Do you know of such a chip ? 

There is a switch to change the range between 10 MHz and 60 MHz.
So, the prescaler could be a 1:6 divider, but that switch could also switch the quartz frequency (there are 3 different crystals, see above)
coromonadalix:
could try the saliva trick on it ???? or something to macro zoom on it and try to read it ??


I would say  if the thing works,  dont play too much in it, if you have an xtal adjustment    you could do some trimming  ....

but

ain't broke don't repair it  lolll


you have some GW Instek  like the GFC8131  or some FC-XXXX   models who share some resemblances ....  you have to search schematics with ICM7216D  as the brain
PinheadBE:
Saliva and microscope helped me to see the "...40", but nothing more.

Thanks for your suggestions: I will further Google
edavid:
Most likely they used a divide by 10 prescaler so they didn't have to switch the ICM7216D clock.  You should be able to confirm that.

Plessey made some suitable parts, and if I squint at the photo it looks like the part number might start with SP.  Look for an old Plessey databook.

If it is a divide by 10, you could always replace it with something like a 74AC160.
coromonadalix:
same  i thought i saw  some SP ...... too

but the only one who ends up with 40  are the SP8640 series   but haven't seen  dip 8 variant,  they are 14-16 pins ...

Mb 501 or MB506  where popular
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