[time-nuts] HP53132A vs SR625
Hui Zhang
ba6it at 163.com
Sat Mar 16 03:33:30 UTC 2013
Hello SAID:
I am very sorry I almost missed this email in my inbox, and say sorry for reply so late, and I am very appreciate you wrote so many useful word for me. I answred your in quote part in this email. Thanks a lot.
After a short consideration, finally I bought SR625, now it on my workbench, I am very satisfied with its work.
I still have few quesiton:
1) When I use long gate time to mesure fequency (like as 10s or more), the STOP LED in channel B will light up, at moment in the reading result, the STOP will off few second, and light up again, is this normal?
2) When I use TI mesurement function, I connect GPS's 1PPS to CH1 and use a BNC tee split signal with 1.5m cable to CH2, in the TIME mode, I saw the 999999990xx etc, if I changed cable length the reading will change, what mean of this reading?
>Hui,
>rent one of each if you can before you make your choice. I have both, and
>the HP unit is much easier to use once you know which button sequence to
>push to get more than just "Frequency/Time-Interval" type measurements - these
>can be single-button events on the HP unit.
>Even offsetting and normalizing frequencies becomes very easy after a
>couple of days of using the unit, there is no setting that takes me longer than
>about 5 seconds to set up, so while not perfect, the user interface can be
>learned easily. I find the SR620 to have too many buttons(!) I always find
>myself searching for just that one button. Anyways, more buttons are just
>more things that can fail. If you are a pilot, and have used a Garmin 430W
>GPS in your life, then the HP user interface is no challenge whatsoever and
>seems very easy to use..
>The SR-620 has it's advantages, especially when you just do one single type
> of measurement, but for me it has a huge number of disadvantages, and I
>mostly use the 53132A for that reason:
>1) I paid quite a bit of money and I had it "calibrated" and fixed by SRS,
>and it still exhibits a significant frequency offset with a "perfect"
>reference and "perfect" DUT!!!
>SRS says a small frequency error is "normal", well that prevents me from
>using the unit as a frequency counter, for me it's only useful as a relative
>display frequency counter. HP doesn't have such a frequency error, so no
>worries there.
I will pay attention and observe those problem....
>2) The SRS unit is soooo loud that it's totally annoying and unacceptable
>for long measurements. Many folks reported this here before. It's just bad.
>Whining like crazy.
Indeed this is little problem but really troube me.
>3) The SRS unit is 19" wide, huge, heavy, and clunky. I need my counter
>portable, only the HP unit will do
No problem, I like huge and heavy device, they are usually reliabe.
>4) The SRS unit has a much lower MTBF because of all the parts inside, and
>it needs finicky adjustments, see item 1) above. The HP unit either works,
>or is just dead. Not much to adjust. Different technology generation. And
>the coolness factor: a nice florescent tube display is so much more modern
>looking than those clunky old 7-segment LED's..
Yes I agree you, the SR625 is 90's product, sort of old and vintage, I am very worry about his lift. The only thing I can do it pray god I can have good luck.
>5) The SRS unit is usually $1000 more than the HP unit, and you don't know
>how good the unit is you are buying because of all of the calibration
>stuff. Usually there is no hit-or-miss issue with the HP units, they either
>work, or are dead.
My SR625's price not bad, very close with HP53132, although it's old. I hope it can work five to ten years that I will be satisfied.
>That said, the HP unit doesn't measure well at 10MHz, so I mostly use a
>divide-by-two to get one more digit of resolution out of it, and it's time
>interval resolution is not as good as the SR620. But for time interval
>measurements I use a Wavecrest DTS unit that blows the SR620 and the HP out of
>the water anyways..
>Bye,
>Said
Hui
>>In a message dated 2/7/2013 16:39:04 Pacific Standard Time, ba6it at 163.com
>>writes:
>>Hello Dear Group:
>>I am very glad to see so many replies in the morning, and I am very
>>grateful to every time nuts gave me useful information, your proposal has
>>strengthened my determination, in fact, I am also very like SR625, So I will to
>>find and buy a good shape SR625 for my new time interval measure instrument.
>>Thanks again for everyone's advice, which is very useful to make a choice
>>for me. Sorry for not reply everyone's mail.
>>Best Regards!
>>Hui Zhang
[time-nuts] HP53132A vs SR625
More information about the Time-nuts_lists.febo.com
mailing list