[time-nuts] Measurement of frequency of HP 8720D option 1D5 oscillator after switch on

Bob Camp kb8tq at n1k.org
Sat Oct 4 18:44:50 EDT 2014


Hi

Both the 5370 and the 620 are getting a bit old. They both run (relatively) hot. Each has their own reliability issues. The 5370 was the more common of the two. Finding parts for it will be easier long term than a 620. Keeping either one fully up to spec long term is likely to be a bit involved. Best bet - get more than one of which ever one you pick. 

Bob

On Oct 4, 2014, at 6:35 PM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

> Dave,
> 
> On 10/05/2014 12:13 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
>> On 4 October 2014 23:03, John Miles <john at miles.io> wrote:
>>>> I just stuck an offer on a SRS 620, which is sold as seen. I'll take a
>>>> chance it works if my offer is accepted.
>>> 
>>> The 5370B is still the only high-performance counter that I own, personally.  SR620s are fine as far as they go,
>> 
>> Is it me, or do they look very cheaply made? I have never seen one for
>> real, but the photo I see on eBay looked more like a $200 Chinese
>> power scope.
>> 
>> I used an Standard Research SR-830 lock-in amplifier extensively
>> during my Ph.D. It was really nice to use. But the SRS 620 looked
>> rather cheap to me.
> 
> Don't judge it on looks alone. While I would have made a few design aspects differently, I think it's a rather nice unit and it does perform better than the 5370B.
> 
>>> but if they have any strong advantages over the 5370 I don't know what they are.  Spending more for a 53230A isn't necessary unless you have a specific need for something that only it can do (and I don't).
>> 
>> I never really looked into it. I just made a low offer on an SRS 620 on eBay.
>> 
>> I am annoyed with myself for selling the 5370B.
>> 
>> I don't really have any immediate need for another TI counter - what
>> need I did have, has since gone. But if I could get one cheap enough,
>> I would.
> 
> If you find a SR620 for a good price, then it's definitly a good thing to have.
> 
> Cheers,
> Magnus
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