Ordered one of these: SDG2042X - Page 1
Forum section: electronics / testgear

author: Wimberleytech
author_rank: Super Contributor
timestamp: March 15, 2019, 10:29:06 pm
content: Recently, I cast aspersions on "signal generators"...don't need them...or least hardly ever.KarmaA project landed in my lap where I need to generate somewhat arbitrary waveforms.At least I will get paid for the work!!Oh...and I think it will be fun to play with too. Should I get paid for having fun??

author: tautech
author_rank: Super Contributor
timestamp: March 15, 2019, 10:36:53 pm
content: Just making sure you know about this thread:https://www.eevblog.com/forum/testgear/the-siglent-sdg2042x-thread/

author: Wimberleytech
author_rank: Super Contributor
timestamp: March 15, 2019, 11:05:37 pm
content: Quote from: tautech on March 15, 2019, 10:36:53 pmNo, I did not...THANKS!

author: ian.ameline
author_rank: Regular Contributor
timestamp: March 20, 2019, 04:42:33 am
content: It's quite easy to hack it to unlock its full 120MHz bandwidth. It's a nice unit. I like mine.

author: Calvin
author_rank: Regular Contributor
timestamp: March 20, 2019, 09:20:22 am
content: Hi,the 40MHz to the 120MHz bandwidth unlash regards only the sine wave functionality.If one doesn´t want to mess around with ´reprogramming´ his device, or simply fears the possible risks, then there´s an easy workaround.Just create a multiple-cycle sine with the asscociated software (say 10cycles) and store that wavefile.You can then replay this waveform with up to 12MHz, effectively producing up to 120MHz.Works like a charmjauuCalvin

author: rf-loop
author_rank: Super Contributor
timestamp: March 20, 2019, 09:59:51 am
content: Quote from: Calvin on March 20, 2019, 09:20:22 amThere is big difference if you produce sine using normal sine or if it is produced using Arb.Difference is cycle to cycle jitter.When Arb is running TrueArb mode max samplerate is 75MSa/sAnd jitter is 150psrms.When running DDS mode true samplerate is 300MSa/s and there 1 clock jitter is 3.34ns ! Except with some special "golden" frequencies. (yes there is 4x opversampling -1.2GSa - but it is bit different thing)Just for thinking, example. 100MHz whole cycle is 10ns.Of course average frequency is 100MHz if run 10MHz DDS Arb and there is 10cycle sine in one Arb length.But signal purity if look time jitter is enormous if compare normal 100MHz sinewave output what have quite good signal quality.I do not have now here available any SDG2000X for demonstrate it with time domain and with frequency domain using SA. But data sheet and understanding and experience how things works.... enough to tell that these two ways for produce sine waves are far away each others if look signal quality.But, of course all depends what user need and what kind of signal quality can accept or not.

author: jpb
author_rank: Super Contributor
timestamp: March 20, 2019, 06:45:40 pm
content: Quote from: rf-loop on March 20, 2019, 09:59:51 amThis is true for square waves but much less so for sine where the amplitude comes into play. With square waves you have a theoretical vertical edge which is either on a sample point or off it so the jitter if there is no compensation will be very large for some frequencies but with a sine curve and a large arb memory the amplitude can vary so you have samples in different points in the sine curve.