Hi Tim,
yes, both units on my workbench, same setup, same power supply.
I´ll exchange the caps.
I wonder why they made efforts to design a physics package with 20 years
lifetime, just to put wet electrolytic caps into such a hot environment.
Regards,
Matthias
Am 25.05.2017 um 13:27 schrieb Tim Shoppa:
Matthias, are the units all over in the same thermal environment when you test
them?
A period of 150s or so in a wobble sounds like a not perfectly damped thermal
cycle time of a lightweight oven or lamp.
Reminds me a little of the unit to unit variation in HP Wien Bridge oscillator
amplitude stability (also a lamp!)
Tim N3QE
On May 23, 2017, at 3:40 AM, Matthias Jelen <matthias.je...@gmx.de> wrote:
Hello Time-Nuts,
i´ve been playing with some Rbs recently.
I compared two LPFRS-01 to a PRS-10. One seems to behave quite well (compared
to the specs given here:
http://www.spectratime.com/uploads/documents/isource/iSource_LPFRS%20Spec.pdf)
- short term stability specs are met), the other one shows quite some phase
ripple (appx. 1 ns RMS with a frequency around 0.007 Hz) which spoils ADEV in
the 60 - 200s range, very similiar to the typical GPSDO bump. Long term
stabilty is OK.
Unfortunatly I didn´t find any schematics on the web. Has anyone encountered a
similiar problem with this unit? Any idea were this might come from? My first
guess would be a problem in the control loop locking the VCXO to the Rb, but I
have no clue which time constants are used in the PLL.
Any hints are appreciated.
Regards,
Matthias
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