Products > Test Equipment
DF3380 Frequency Counter
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PinheadBE:
Hi,

DF3380 was a cheap frequency counter sold in Europe,  end of the nineties. See picture.

I am looking for:
- its specs
- its user manual
- its service manual, if any

Schematics and calibration procedure highly welcome

Thanks
J-R:
I doubt there is a calibration "procedure", other than just adjusting a single trimmer for the oscillator. Photos of the back and inside?  Does it work?
PinheadBE:
I will receive it tomorrow and will test it

I guess this is a super simple model without any processor, only logic chips
coromonadalix:
must be based on intersil  frequency counter chips,  there was tons of theses designs

https://www.qsl.net/iw2grf/pdf/icm7216.pdf

there was an 40 pins dip too  icl7226 

https://pdf.datasheetcatalog.com/datasheets2/17/177840_1.pdf


only adjustment  was  a 10mhz clock source

check  goldstar, some kenwood ....
PinheadBE:
I suspect it's even simplier than that.

There is no function button, it seems to measure only frequency.

Also, the "Display Test" button is a dead giveaway of a 7447 BCD to 1-digit driver logic chips ....

In 6 hours from now, I will have the answer.

About the internal oscillator, it surely will not be something of great precision, and I plan to invest a couple of bucks to change it into something in the range of 1% precision.   I don't need more precision, since this will not be my primary counter, but a secondary one

EDIT: I stand corrected: the Intersil chips you mentionned do also have a Display Test function.   
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