In the past there has been much discussion on this list regarding the
relative strengths and weaknesses of the 5370 (20ps resolution) and the
5371/5372 (150ps resolution) units. There are other units that have
even better resolution, but they tend to be pricey and/or more specialized.
Moving down another step in resolution, the Racal-Dana 1991 and 1992 (1
ns resolution) counters also have their fans (like me), but they do have
problems with their front panel buttons (actually the switches under the
buttons).
Yes, the prices on ebay are becoming increasingly ridiculous.
Occasionally a seller will have an attack of sanity and post a
reasonable price. You may also get lucky with a unit that is defective,
or advertised as such, but has either no fault or a repairable one.
More info on all of these topics is available by using Google with the
site:www.febo.com advanced search term.
Ed
On 1/8/2013 7:32 PM, dlewis6767 wrote:
I am looking to upgrade my older HP 5245L counter/ timer to one with greater
resolution.
In my home lab, I have been collecting GPS timing modules (receivers) and just
want to start measuring their 1PPS jitter, etc. over one period.
The 5245L will only measure to 100ns with a 1 second pulse (.1us period at 1
period).
I was looking at the HP5370/ 71/ 72 series counter/ timers. What is the best
resolution they can provide for a one second pulse (over one period)?
Do you have any recommendation as to which one of the three models is the
better unit? (Their display technology, age and cost not withstanding.) All
three models seem greatly overstated in price on eBay, seems, too. Not sure
why, ...just supply and demand; I presume.
Thank you for your advice; I appreciate your thoughts.
Don Lewis
Austin, TX (Hyde Park)
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