I too, fell for the siren song of cheap Chinese probes. 2 years after I bought 4 of them, only one has not failed. However, my 1980's vintage probes from Tek still work dandily.
On Thu, Mar 17, 2011 at 12:47 PM, beale <[email protected]> wrote: > Yes, I am controlling the OCXO frequency with a voltage input (center tap of > 10k trimpot from +5V to ground). I hooked up my custom 26 MHz PIC divider* > and was able to trim the OCXO to match the output of my GPS 1pps signal to > better than 1E-9 (at least for short periods of time). > > These parts draw about 60 mA at +5V in operation in a 23 C ambient > environment, after a brief one-time warmup pulse of about 200 mA. The can > gets a bit warm if left open. I taped a small thermistor against the case, > and made a little styrofoam box to nest snugly over it and measured the can > case temp to reach about 50 C when thus insulated. > > I am accumulating some performance data on the two units I have and can post > it online if anyone is interested. (actually, I was thinking of buying a > bunch more before posting the data, because the price seems too good to be > true). > > * http://www.bealecorner.org/best/measure/time/source/ > > Scott Newell wrote: >> That's a great price for any OCXO. Do they have EFC? (I can't tell from the >> part number in the auction photo.) > > At 01:41 PM 3/17/2011, beale wrote: > output of a 26 MHz Pletronics OCXO in a 14DIP can (by the way these go for > $2 online, the cheapest OCXO I've seen). > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > -- --Eric _________________________________________ Eric Garner _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
