Gerhard,
On 01/27/2015 09:00 PM, Gerhard Hoffmann wrote:
Hi, fellow time nuts,
I have some questions regarding the Stanford SR620:
1. Is it a drawback wrt ADEV when a SR620 does not have have the opt. oven
if I have an ultra clean external reference? Does it use the external
ref directly
or does it just pull the own reference to the external value in the long
run,
no matter if it's the good or the bad oscilator?
It locks it up with a PLL. See page 9 in PDF below, smack in the middle
is the input circuit and PLL.
This page also gives you all the hints of how to wire in a better
oscillator if you wish.
2 I have seen that the manual has a parts list and references the circuit
diagrams, but they are not included in the pdf. Are the circuits somewhere
out there?
http://www.ko4bb.com/manuals/81.226.54.139/SR620_Universal_Time_Interval_Counter_Schematics.pdf
My 5370A has become so unreliable that it needs replacement.
What issues do you see?
Cheers,
Magnus
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