Hej Björn, On 05/29/2018 10:03 PM, Björn wrote: > If this is a badged CNT-91... > > This is from the current spec. > > ”The CNT-91 features a frequency range of 0.001Hz to 400 MHz standard with > options to 3, 8, 14 and 20 GHz. ” > > The counter was designed while Pendulum still did R&D in Stockholm - not very > far from Magnus domains. Magnus certainly knows how to do proper ADEV with > that counter.
Yeah, I know the designers. They borrowed some of my counters at one time for one research project. Anyway, I have a CNT-90 (++, it's modified in several ways). I have not really worked with the CNT-91, but don't think it is very much different than the CNT-90. I have only seen the FCA-3000/3100 at fairs. So, given that, it should be simple enough to set it up in time-interval mode, let the start-channel set the pace of the measurement as usual and then record into TimeLab. I have not seen any built-in ADEV, that used to be done in a separate software they had, and see, TimeView is available from Tektronix too as TVA3000. TvB has a CNT-91, he can let you know if there is any specifics for that model to care about. Cheers, Magnus > — > > Björn > > Sent from my iPhone > >> On 29 May 2018, at 20:58, gandalfg8--- via time-nuts <time-nuts@febo.com> >> wrote: >> >> >> I have a Tek FCA3103 300 MHz counter that measures ADEV >> >> as a built in function. When I bring up the settings >> menu for the measurement, it has an entry window for >> "tau" (the averaging time, IE "sigma sub y of tau"). >> It defaults to 200 ms. I can enter larger values and >> ADEV gives reasonably results. However, if I enter >> smaller values, even 199 ms, I don't get any error >> on the display, but I get clearly erroneous >> results for ADEV. I read the manual and cannot find >> anything to the effect that the instrument doesn't work >> for less than 200 ms. >> >> BTW, I asked Tek "customer no support" about it and >> they were clueless. >> ------------------------------- >> >> >> >> Hi Rick, >> >> >> The Tek FCA3100 is a rebadged Pendulum CNT91 and Pendulum became part of >> Spectracom. >> Unless I'm missing something, the FCA3103 is the FCA3100 with 3GHz input C >> fitted. >> >> >> I've also found that Tektronix tech support seemed to know very little about >> these but, in the past anyway, found Spectracom in the UK to be very >> helpful. I'm not sure about the current status as Spectracom now seems to >> redirect to Pendulum as a separate company again. >> >> >> >> Unfortunately, I can't help with your enquiry, and am also somewhat >> confused, as I don't recall seeing a settings entry window for "tau" as a >> settings option for the built in ADEV function. I take it you do mean the >> built in option as in displaying results on the built in screen, or are you >> also using some external software? >> >> >> If you are just usin the built in display I'd be interested to hear what >> firmware version your FCA3103 is showing in the "About" screen >> >> >> >> My FCA3100 is showing the firmware version as 1.28s of 25 Aug 2010, which >> seems to match the latest available Tektronix download but I'm wondering now >> if there are unlisted updates. >> >> >> >> Nigel, GM8PZR >> >> >> >> >> >> >> >> >> >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
