New Tektronix TBS2000 - Page 1
Forum section: electronics / testgear

author: mzdenkov
author_rank: Regular Contributor
timestamp: August 08, 2016, 02:27:13 pm
content: Well i saw this on Farnell today:http://si.farnell.com/tektronix-tbs2000-oscilloscope?ICID=I-HP-LB-tektronix-TBS2000The price is right, performance is quite OK. but they had to screw it somewhere.-Sampling Rate: 1GS/sWhen i saw that they make 100MHz 4 channel Oscilloscope i've nearly got a stroke.The Nyquist Theorem, sample frequency must be minimum 2*fin(and here youll lose some/many harmonics).So i assume that you as a user, cant get full performance, if you measure on all 4 channels f.e. 100 MHz CLK signals.In conclusion: I've expected more from a € 2.080 Oscilloscope.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: August 08, 2016, 02:29:16 pm
content: Quote from: mzdenkov on August 08, 2016, 02:27:13 pmDeja vu?https://www.eevblog.com/forum/testgear/new-tektronix-tbs2000-oscilloscopes/

author: mzdenkov
author_rank: Regular Contributor
timestamp: August 08, 2016, 02:33:46 pm
content: sweet mother of God... As it looks like its not Deja vu. But noone touched Sampling Rate.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: August 08, 2016, 02:51:02 pm
content: Quote from: mzdenkov on August 08, 2016, 02:33:46 pmProbably because it's not very relevant considering that this was designed for the educational market. Which also won't pay nearly as much as Farnell wants for it.Also, the sample rate is fine. I haven't checked if it drops in 2ch and 4ch mode but even if so, 250MSa/s are sufficient to capture a 100MHz sine wave.And if you use a 100MHz scope to look at a 100MHz clock signal (which usually is non-sine) then you're doing something very wrong anyways. No matter what sample rate.

author: Fungus
author_rank: Super Contributor
timestamp: August 08, 2016, 03:04:49 pm
content: Quote from: mzdenkov on August 08, 2016, 02:27:13 pma) If you only enable 1 channel you get 1GS/s on that channel (I assume - even a Rigol DS1000Z can do that)b) You can't really look at 100Mhz CLK signals withany100MHz scope.

author: David Hess
author_rank: Super Contributor
timestamp: August 08, 2016, 06:29:17 pm
content: Quote from: Fungus on August 08, 2016, 03:04:49 pmIt is not really clear from the available datasheet. The manual should clear this up but of course Tektronix no longer allows downloading manuals since their latest website redesign.QuoteWell, you can, but it looks like a sine wave. The ancient Tektronix 2232 does exactly this because Tektronix was in the habit at the time of showing the waveforms in the service manual using the same oscilloscope. The 2232 uses separate 100 MHz differential ECL sampling and ADC clocks.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: August 08, 2016, 06:39:12 pm
content: Quote from: David Hess on August 08, 2016, 06:29:17 pmStrange, as I managed to download the TBS2000 user guide and service manual as pdf files two minutes ago. It's all right there...As to the sample rate, the manual states that it's 1GSa/s in 1ch and 2ch mode (as long as both channels are from different pairs, i.e. Ch1+Ch3). In 4ch mode, or in 2ch mode when both channels are from the same pair, the sample rate is 500MSa/s.That is better than the Rigol DS1000z.

author: ErnestoFB
author_rank: Newbie
timestamp: July 29, 2017, 04:55:47 am
content: Folks,I simply loved every detail of my TBS2104! And you can adjust the brightness for sure!