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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
