Thank you Bob, Ed, Magnus , ..and all.
Excellent reviews, ...detailed and clear. I REALLY do appreciate it.
HP has turned out so much equipment over the years, it is often good to see
a comparison. This was excellent.
I'll wait for a good deal, ....and don the road bid alongside many of you ,
I presume. :-)
I may opt for one of the better units, ...as this disease progresses.
-Don
--------------------------------------------------
From: "Bob Camp" <li...@rtty.us>
Sent: Wednesday, January 09, 2013 6:43 AM
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Subject: Re: [time-nuts] Interval Timer Recommendation
Hi
There are a number of counters that are a lot better than what you have.
There's also a limited amount of money in the universe. I'd suggest
setting a rational budget and time frame. This is all used gear. You
*might* get a perfect one that never ever breaks. More likely you will
need to get a couple and swap things around. I'd plan on buying 3 or 4
with what ever the budget is. If you get lucky, you come in under budget.
Less fancy:
5334 - couple of ns resolution, nice and small, B is *very* different than
the A so get one or the other
5335 - faster bigger heavier, one ns resolution.
both should be around $100 before shipping.
Very cool:
53131 500 ps resolution
53132 150 ps resolution
both have displays that can wear out. They are no longer supported by HP
so you *might* find somebody dumping them. Hard to find for less than
$800.
Big and heavy:
5371, 5372 same resolution as the 53132
They don't show up much. I've seen them for $200. You probably should
expect to pay $400. Expect shipping to be non-trivial.
High end:
SR620
5370
53230a
All are in the 20 ps range. You do see 5370's for $200. More commonly you
see them for quite a bit more. The 620's show up anywhere between $800 and
$3000. The 53230a is brand new with a warranty from Agilent for about
$3700.
That's just one set of parts. There are others. There are more issues than
just price to consider. The 5371 is a *big* piece of gear. The 53xxx boxes
are all small enough to carry around.
Lots of choices.
Bob
On Jan 8, 2013, at 9:50 PM, dlewis6767 <dlewis6...@austin.rr.com> wrote:
Hi Magnus, ....good day.
Thanks for the thoughts, ...that was pretty much where I was headed. I
think I will hold out a while for a 5370, ....watch eBay, see if a
reasonably priced unit pops up.
If anyone has one for sale for a nice price, please let me know.
-Don
--------------------------------------------------
From: "Magnus Danielson" <mag...@rubidium.dyndns.org>
Sent: Tuesday, January 08, 2013 7:42 PM
To: <time-nuts@febo.com>
Subject: Re: [time-nuts] Interval Timer Recommendation
Hi Don,
On 01/09/2013 02:32 AM, 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.
Of the given set, the HP5370 will have much better single shot
resolution compared to the HP5371/5372. The later is better at recording
high rate events.
I have both HP5370 and HP5372 as they fill different purposes. I also
have counters of better performance than these.
Trouble is, with PPS signals you experience jitter such that a 1 ns
resolution of a HP5335 will suffice for most usages.
Cheers,
Magnus
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