[time-nuts] HP-5065a bought and finally working!

John Ackermann N8UR jra at febo.com
Fri Aug 24 16:53:28 EDT 2012


Hi Eduardo --

For longer term measurements (e.g., tau of an hour or more) a very nice 
and inexpensive counter is the HP 5334A/B.  I haven't looked recently, 
but in the past I bought several off eBay for $150 or less.  They are 
fairly modern, compact (2U high), and don't have a noisy fan.  They have 
2ns time interval resolution in single shot mode, have a built-in 100 
sample average, and have GPIB output.

You can use a Prologix (http://prologix.biz) USB - GPIB converter to 
talk to the 5334 from John Miles' TimeLab software.

For longer measurements, it's usually easiest to use a PPS signal rather 
than 5 MHz.  There are a number of ways to derive that, but I'll put in 
a shameless plug for the TAPR TADD-2 Mini 
(http://tapr.org/kits_t2-mini.html) as an inexpensive PPS generator.

With that set-up and a GPS you will be able to measure the medium-term 
stability and aging of your 5065A.

John
----
On 8/24/2012 4:40 PM, Edgardo Molina wrote:
> Dear Chuck,
>
> Thank you for your advise. Could you please kindly give me an example of such a GPIB counter with phase measurement? HP model number? My 5065a has been running with a beautiful green light for almost 72hrs. Glad to be back home and found it warm and stable.
>
> Take care!
>
> Regards,
>
>
>
> Edgardo Molina
> Dirección IPTEL
>
> www.iptel.net.mx
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> T : 55 55 55202444
> M : 04455 20501854
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> On Aug 22, 2012, at 2:03 AM, Chuck Forsberg WA7KGX N2469R <caf at omen.com> wrote:
>
>> If it is a really good Rb standard, consider adjusting the
>> standard yourself by measuring the phase over several
>> days once the standard has warmed up and settled down.
>> A GPIB counter with phase measurement is useful for this.
>>
>> --
>> Chuck Forsberg WA7KGX N2469R     caf at omen.com   www.omen.com
>> Developer of Industrial ZMODEM(Tm) for Embedded Applications
>>   Omen Technology Inc      "The High Reliability Software"
>> 10255 NW Old Cornelius Pass Portland OR 97231   503-614-0430
>>
>>
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