Products > Test Equipment
DF3380 Frequency Counter
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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