[time-nuts] Information on OVCXO

Dave Brown tractorb at ihug.co.nz
Tue Jun 12 16:37:31 EDT 2007

> I just become the owner of a Precision Crystal EROS-750- SBR -4 
> voltage controlled OCXO. I believe that this is the oscillator that 
> is used in the SRS SR620 Frequency Counter when it has the 2-ppb 
> option-01 timebase (please correct me if wrong info). The unit has 
> four terminals simply labled 1-4 on the bottom as well as the case 
> studs. The label says it is a +15VDC unit. Can anyone provide the 
> pin-out of this oscillator. Short of an actual pin diagram, can 
> anyone suggest a way to help identify each pin function, i.e. DC 
> resistance, AC impedance, safely applying power with series 
> resistance? I do not want to blow this unit as I have high hopes for 
> it as a replacement disciplined oscillator in my Trimble Thunderbolt 
> GPS timebase. I will be glad to share my conversion experience as I 
> proceed with this project. Thanks in advance for any help.
> Don Johnson
> True-Cal Services
 So what happened to the original oscillator, Don?
 DaveB, NZ

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