| Products > Test Equipment |
| DF3380 Frequency Counter |
| (1/3) > >> |
| 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. |
| Navigation |
| Message Index |
| Next page |