[time-nuts] Favorite counters (current production)?

[Bob Bownes]

That reminds me, should anyone have a schematic for an SR 830 walking amplifier, can you please get in touch with me. I have one that keeps eating voltage regulators.

> On Nov 12, 2017, at 12:12, Dr. David Kirkby (Kirkby Microwave Ltd) <drkirkby at kirkbymicrowave.co.uk> wrote:
> 
>> On 10 November 2017 at 16:37, Bob Camp <kb8tq at n1k.org> wrote:
>> 
>> Hi
>> 
>> There is no perfect answer. I’d go with the 53230 simply because it
>> *might* be supported
>> the longest.
>> 
>> Bob
>> 
> 
> 
> If I had to take a bet, I would say the SR620 will be supported longer.
> Stanford Research seem to be selling the same products they have for
> decades. I started my Ph.D. in about 1994, and bought what was a very new
> product - the SR830 lock in amplifier.
> 
> http://www.thinksrs.com/products/SR810830.htm
> 
> 23 years later, it is still a current product.
> 
> Stanford Research also sell a couple of LCR meters
> 
> http://www.thinksrs.com/products/SR715720.htm
> 
> The SR720 looks remarkably like the long obsolete HP E4925A LCR meter.
> 
> There's no doubt in my mind that Stanford Research sell their products much
> longer than HP/Agilent/Keysight. Of course, that does mean Stanford
> Research are using older technology.
> 
> I would add, when I have contacted Keysight about obsolete products they
> have always been helpful. When I contacted Stanford Research to ask what
> was the latest firmware for an SR620, I was ignored. They also ignored some
> other email I sent them. So their support does not seem as good as
> Keysight, but I assume, with persistence, one could get support on a
> current product.
> 
> Dave
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