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
T : 55 55 55202444
M : 04455 20501854
Piensa en Bits SA de CV
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On Aug 22, 2012, at 2:03 AM, Chuck Forsberg WA7KGX N2469R <[email protected]> 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 [email protected] 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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