Re: time-nuts Digest, Vol 250, Issue 16 On Mon, 24 Feb 2025 03:30:09 -0500, time-nuts-request@lists.febo.com wrote: > ---------------------------------------------------------------------- > > Message: 1 > Date: Sat, 22 Feb 2025 16:26:14 +0100 > From: Magnus Danielson <magnus@rubidium.se> > Subject: [time-nuts] Re: Has anyone played with the Pendulum CNT-104R? > To: Attila Kinali via time-nuts <time-nuts@lists.febo.com> > Message-ID: <2faacc00-2986-4c96-b059-f3ef97b77bd8@rubidium.se> > Content-Type: text/plain; charset=UTF-8; format=flowed > > Hi, > > On 2/22/25 10:54, Attila Kinali via time-nuts wrote: >> On Fri, 21 Feb 2025 23:48:16 +0000 >> Tom Knox via time-nuts<time-nuts@lists.febo.com> wrote: >> >>> I am a big fan of the CNT90/91 series. So, I just rushed to the >>> site with great anticipation and left somewhat disappointed. I was >>> hoping for a next gen instrument for T&F metrology. >> In terms of time-frequency counters, the CNT-104 is a pretty big >> step. Just compare what happened the last 20 years. After the >> reciprocal counter was introduced in the 70s, the first real >> change was the continious time-stamping, which came in the early >> 2000s by Pendulum with the CNT-90. > > I agree fully. The CNT102/104 builds on the continuous improvements from > CNT80/81 (ASIC based), to CNT90/91 (First FPGA based, ADC interpolator) > to now CNT102/104 (FPGA based, FPGA interpolator). > > I actually think I recall that the CNT80/81 could do continious > timestamping too, but it was more a traditional counter in that regard. > > What has developed in how much that was accessable, and while the > documentation was always there, it has gone more into the thinking. > > I proposed a more multichannel counter for them back in the day, as it > would enable monitoring multiple sources at the same time, either for > testing, for more elaborate measurement setups or for thinks like small > ensamble clocks. The CNT104 can do exactly that. Back in the day of > CNT90/91 just released focus was on improved performance. CNT81 had a 25 > ps precision, CNT90 has 100 ps, CNT91 pushed that to 50 ps (minor tweaks > on essentially the same hardware). Also, the separate line was the > Wandermeters with WM10, WM11 and then the large screen platform now > available as Calnex Senteniel. > > In this regard, CNT104 is just a step forward in performance and > capabilities. This is to be expected for such general instrument. > Magnus, is there better principles-of-operation documentation on the CNT-104R available? All I can find is the sales literature. Joe