Re: [time-nuts] HP5370A vs B version
There was an informative thread back in 2005 on the topic of hp 5370A vs. 5370B: https://www.febo.com/pipermail/time-nuts/2005-April/018053.html It's worth reading the entire thread, or at least, read the reply by JJ (from Agilent T): https://www.febo.com/pipermail/time-nuts/2005-April/018057.html /tvb On 7/19/2019 11:00 AM, Taka Kamiya via time-nuts wrote: What are the differences between HP5370A and 5370B version? I have been told A's input ports are rather delicate and it has been better protected on B version. I found notes on A and B and looked a them side by side but honestly, they are difficult to compare. Anyone on list who had both and can tell from experience? --- (Mr.) Taka Kamiya KB4EMF / ex JF2DKG ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] HP5370A vs B version
kb...@n1k.org said: [Context is 10811s.] > Because they are an un-sealed unit, power off storage is not kind to them. > Some take a long time to recover. A few never really seem to settle down. What's the mechanism? Lots of stuff ages faster when it is warm/hot. I'd guess humidity. What's the time scale? If 20 years of power off is nasty, is 1 year OK? 1 month? What have we learned about packaging since then? Would a similar design made with modern parts hold up better? -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] HP5370A vs B version
There were field upgrades from HP5370A to B, I believe offered through the HP field services operation. I have an A->B converted unit. I believe it has the original front end, but the “B” firmware. It has been a while since I opened it up. Sent from my iPhone > On Jul 20, 2019, at 10:35, Taka Kamiya via time-nuts > wrote: > > Thank you. > I really do not want to buy from eBay. So far, none showed up with zero > problems. There's always something. My intent is to lock it to house > standard which is a GPSDO. I have lots of 10811 here but I don't know when > they were made. All I know is they are all 10811-6011. You are right - > especially for an instrument like this, standard is extremely important. > > --- > (Mr.) Taka Kamiya > KB4EMF / ex JF2DKG > > >On Saturday, July 20, 2019, 11:02:19 AM EDT, Bob kb8tq > wrote: > > Hi > > If you are buying them on eBay, it is not at all clear which OCXO your A or B > will show up > with. The 10811’s get swapped back and forth with earlier units in a lot of > used gear. One > might *think* it’s a one way exchange, but I’ve seen it go both ways. > > If you lock the counter to an external standard, it really does not matter a > lot which OCXO > is in it. > > Bob > >> On Jul 20, 2019, at 4:21 AM, Frank Stellmach >> wrote: >> >> Hi Mr. Taka Kamiya, >> >> the B version has a 500MHz front end, copied from the HP5345A, with a >> matched pair of amplifier / Schmitt trigger hybrids. >> The A version has separate amplifier and Schmitt trigger ICs. >> >> There were also changes on the trigger circuit. >> >> Then the B version has a simplified µP board, has the OCXO (10811-60111), >> which is a must for absolute T.I. and frequency measurements. >> >> Maybe the firmware was also improved a bit, I think mainly concerning the >> GPIB steering of the trigger circuit. >> >> This T.I. counter is supposed to be superior over others of that era, >> because this special time interpolator was more linear. >> >> I really love mine, so I don't want to sell it. >> >> Frank >> >> >> ___ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. > > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] HP5370A vs B version
Am 20.07.19 um 10:21 schrieb Frank Stellmach: the B version has a 500MHz front end, copied from the HP5345A, with a matched pair of amplifier / Schmitt trigger hybrids. The A version has separate amplifier and Schmitt trigger ICs. There were also changes on the trigger circuit. Then the B version has a simplified µP board, has the OCXO (10811-60111), which is a must for absolute T.I. and frequency measurements. My 5370A came with a 10811-60111 time base. It also came with LOTS of intermittent contacts, but it was nearly for free, so I can't complain. I solved the contact problem by buying a SR620 that was still under cal. :-) Gerhard ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] HP5370A vs B version
Hi If you have a pile of 10811’s a fun experiment is to put them on power for a couple months. Log the frequency once a day or so and watch how they “drift in” to whatever the final frequency is. Because they are an un-sealed unit, power off storage is not kind to them. Some take a long time to recover. A few never really seem to settle down. Since the ones that don’t settle are not of a lot of use, they often head off to eBay and get passed from hand to hand over the years. In some cases you *can* find a problem component. There aren’t a lot of people who dig that deep *and* get it right. Bob > On Jul 20, 2019, at 11:35 AM, Taka Kamiya via time-nuts > wrote: > > Thank you. > I really do not want to buy from eBay. So far, none showed up with zero > problems. There's always something. My intent is to lock it to house > standard which is a GPSDO. I have lots of 10811 here but I don't know when > they were made. All I know is they are all 10811-6011. You are right - > especially for an instrument like this, standard is extremely important. > > --- > (Mr.) Taka Kamiya > KB4EMF / ex JF2DKG > > >On Saturday, July 20, 2019, 11:02:19 AM EDT, Bob kb8tq > wrote: > > Hi > > If you are buying them on eBay, it is not at all clear which OCXO your A or B > will show up > with. The 10811’s get swapped back and forth with earlier units in a lot of > used gear. One > might *think* it’s a one way exchange, but I’ve seen it go both ways. > > If you lock the counter to an external standard, it really does not matter a > lot which OCXO > is in it. > > Bob > >> On Jul 20, 2019, at 4:21 AM, Frank Stellmach >> wrote: >> >> Hi Mr. Taka Kamiya, >> >> the B version has a 500MHz front end, copied from the HP5345A, with a >> matched pair of amplifier / Schmitt trigger hybrids. >> The A version has separate amplifier and Schmitt trigger ICs. >> >> There were also changes on the trigger circuit. >> >> Then the B version has a simplified µP board, has the OCXO (10811-60111), >> which is a must for absolute T.I. and frequency measurements. >> >> Maybe the firmware was also improved a bit, I think mainly concerning the >> GPIB steering of the trigger circuit. >> >> This T.I. counter is supposed to be superior over others of that era, >> because this special time interpolator was more linear. >> >> I really love mine, so I don't want to sell it. >> >> Frank >> >> >> ___ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe, go to >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com >> and follow the instructions there. > > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] HP5370A vs B version
Thank you. I really do not want to buy from eBay. So far, none showed up with zero problems. There's always something. My intent is to lock it to house standard which is a GPSDO. I have lots of 10811 here but I don't know when they were made. All I know is they are all 10811-6011. You are right - especially for an instrument like this, standard is extremely important. --- (Mr.) Taka Kamiya KB4EMF / ex JF2DKG On Saturday, July 20, 2019, 11:02:19 AM EDT, Bob kb8tq wrote: Hi If you are buying them on eBay, it is not at all clear which OCXO your A or B will show up with. The 10811’s get swapped back and forth with earlier units in a lot of used gear. One might *think* it’s a one way exchange, but I’ve seen it go both ways. If you lock the counter to an external standard, it really does not matter a lot which OCXO is in it. Bob > On Jul 20, 2019, at 4:21 AM, Frank Stellmach > wrote: > > Hi Mr. Taka Kamiya, > > the B version has a 500MHz front end, copied from the HP5345A, with a matched > pair of amplifier / Schmitt trigger hybrids. > The A version has separate amplifier and Schmitt trigger ICs. > > There were also changes on the trigger circuit. > > Then the B version has a simplified µP board, has the OCXO (10811-60111), > which is a must for absolute T.I. and frequency measurements. > > Maybe the firmware was also improved a bit, I think mainly concerning the > GPIB steering of the trigger circuit. > > This T.I. counter is supposed to be superior over others of that era, because > this special time interpolator was more linear. > > I really love mine, so I don't want to sell it. > > Frank > > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] HP5370A vs B version
Hi If you are buying them on eBay, it is not at all clear which OCXO your A or B will show up with. The 10811’s get swapped back and forth with earlier units in a lot of used gear. One might *think* it’s a one way exchange, but I’ve seen it go both ways. If you lock the counter to an external standard, it really does not matter a lot which OCXO is in it. Bob > On Jul 20, 2019, at 4:21 AM, Frank Stellmach > wrote: > > Hi Mr. Taka Kamiya, > > the B version has a 500MHz front end, copied from the HP5345A, with a matched > pair of amplifier / Schmitt trigger hybrids. > The A version has separate amplifier and Schmitt trigger ICs. > > There were also changes on the trigger circuit. > > Then the B version has a simplified µP board, has the OCXO (10811-60111), > which is a must for absolute T.I. and frequency measurements. > > Maybe the firmware was also improved a bit, I think mainly concerning the > GPIB steering of the trigger circuit. > > This T.I. counter is supposed to be superior over others of that era, because > this special time interpolator was more linear. > > I really love mine, so I don't want to sell it. > > Frank > > > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
Re: [time-nuts] HP5370A vs B version
Hi They both run hot and have “interesting” calibration procedures. Count on spending some time running through this and that to get the best performance out of them. The B does seem to run a bit better, but both meet the same basic specs. The SR610 is a very similar device (with some similar calibration procedures). I would go for one of them rather than the 5370. The 610 seems to be just a little bit easier to keep running. If cost is no object ( … as if …) there are indeed a number of devices out there that now do a much better job than the 610 or the 5370. Finding (say) a TImePod on the used market seems to be a bit rare …. Bob > On Jul 19, 2019, at 2:00 PM, Taka Kamiya via time-nuts > wrote: > > What are the differences between HP5370A and 5370B version? > I have been told A's input ports are rather delicate and it has been better > protected on B version. I found notes on A and B and looked a them side by > side but honestly, they are difficult to compare. Anyone on list who had > both and can tell from experience? > > --- > (Mr.) Taka Kamiya > KB4EMF / ex JF2DKG > ___ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.