Dr Bruce Griffiths wrote: > Said > > [EMAIL PROTECTED] wrote: > >> Hi guys, >> >> Some comments: >> >> * The Vref output of most OCXO's is from a Zener diode inside the can. >> These >> typically have aging, thermal sensitivity and very poor voltage accuracy, >> and there are much better monolithic high-precision, low-tempco voltage >> reference available on the market now (Digikey etc). Depending on the >> internal >> design of the OCXO, it may help the noise and stability to add an external >> 100uF >> or larger tantalum cap to the Vref pin, since it's voltage is likely used >> as >> the power supply for the Oscillator etc. >> >> > If you want the lowest tempco and drift available try using an LTZ1000 > (used in HP 8 1/2 digit DVMs). > In those cases where a thermally stabilized reference is undesirable (power consumption, power dissipation, thermal stabilization time at power up), see Thaler www.thaler.com They have the best (as far as I know) thermally compensated references and the best initial accuracy.
Didier KO4BB _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
