Hi Magnus, I got the E1740 last year on ebay for 80EUR and wrote a quick to dirty software for it. This is my thread about it: https://www.eevblog.com/forum/testgear/hp-e1740a-time-interval-analyzer-292384/msg3718660/#msg3718660
It has 2 channels and can timestamp any edge up to 80 Mhz. It is possible to measure with one channel, with 2 channels and the difference between them. I hope to see a difference between the direct input and the TLV3501. I also have 2 Acam 2 channel TDC AS6501 with DDR-LVDS outputs and 10ps resolution. With this it should be possible to sample up to 12,5 MHz with a FPGA. This will be my next project. There is also the AS6500 which has 4 channels, but can only be read out via SPI. For the LTC6957 I will use the circuit from here: https://ohwr.org/project/wr-low-jitter/uploads/74305092be60598e9bffd39d59489594/Daughterboard_V2.pdf Page 4. Hans-Georg Am 2022-05-29 18:35, schrieb Magnus Danielson via time-nuts: > Hi Hans-Georg, > > On 2022-05-28 17:04, Hans-Georg Lehnard via time-nuts wrote: > >> Hello Magnus, >> >> I understood that simply sampling 3 channels fast and averaging does not >> solve all the problems ;-). > Sure, I just want to illustrate how various approaches could allow you to get > the most out of the hardware you have. > >> I have a HP E740A time interval analyzer that I might use for my >> oscillators. >> The HP-TIA has 50ps resolution, can sample 10 Mhz directly but has only >> 512K sample memory. For longer recordings I can use the histogram >> function. I still need to do some work on my software for that, but that >> might be the fastest way to get results. > Does the E1740A have a high speed time-stamping port? The 5371A and 5372A > have that as an option, so if one could have some suitable hardware process > on those time-stamps, it would be something. > >> Attached is a picture of my HP10811 and another one that someone made >> for me as a comparison to other TIAs. >> >> The third pic shows another meter i have with TLV3501 and TDC7200 >> without averaging compared to an FA2. >> >> I will keep trying with the TDC7200 and maybe better with the LTC6957 >> and only one channel. > > Yes, to try different approaches. The LTC6957 is a very cool little chip. > > Cheers, > Magnus > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-le...@lists.febo.com _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com