[time-nuts] SR620 on eBay (not mine) 7512332987

[Brooke Clarke]

Hi George:

It's just a guess (my counter's tied up now so can't do experiment), but 
in order to get down to 1 micro hertz (1 pico second) there's some 
analog stuff (time to amplitude) going on and the manual says you should 
run the self calibration once per month.

The operational check is to measure the width of the internal 1 kHz REF 
OUT, it's supposed to be 500 ns +/- 100 ps, and if not you're supposed 
to run the self cal.  This is a low jitter pulse locked to the 10 MHz 
reference.

I guess this isn't your father's counter.

Have Fun,

Brooke


george wrote:

> Shouldn't the below mentioned counter be displaying 10000000.00000hz
> when its measuring its own 10 mhz reference.
> 
> All of my 9 counters, racal 1996, hp 5334 a's & b's, fluke 1936, hp
> 5335a etc will all show .0000hz when measuring there own internal
> reference. We all know why.
> 
> But it the stanford research counters different of is the sellers item
> flakey?
> 
> The seller
> 
> I don't think I've ever seen a counter
> 
> Brooke Clarke wrote:
> 
>>Hi:
>>
>>There's an SR620 counter on eBay as item 7512332987.
>>It's not mine, just info.
>>
>>Brooke Clarke, N6GCE
>>--
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>>
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