New standard waveform-generator ? - Page 1
Forum section: electronics / testgear

author: Sharp
author_rank: Contributor
timestamp: September 23, 2021, 01:34:18 pm
content: Hi ThereI’m going to purchase a new standard waveform-generator and will ask what you guys can recommend ?I need at least 100 MHz two channels - Is it still possible to hack the SDG2042X to 120 MHz ?BrSharp

author: tautech
author_rank: Super Contributor
timestamp: September 23, 2021, 08:10:36 pm
content: Quote from: Sharp on September 23, 2021, 01:34:18 pmYep.Follow your nose from here:https://www.eevblog.com/forum/testgear/beginers-trifeta-of-bench-instuments/msg3703477/#msg3703477

author: Sharp
author_rank: Contributor
timestamp: September 23, 2021, 09:02:45 pm
content: @tautechThank you so much

author: QLF
author_rank: Contributor
timestamp: October 03, 2021, 05:29:44 am
content: Thanks, guys .. I am going to buy one as well

author: Sharp
author_rank: Contributor
timestamp: October 03, 2021, 08:16:55 pm
content: I can recommend to follow this link:Follow the process from Chuck1000rr as listed below and the link to EEVblog below this line:https://www.eevblog.com/forum/testgear/siglent-sdg2042x-hack-door-closed/msg3526004/#msg3526004My hack was a success

author: QLF
author_rank: Contributor
timestamp: October 05, 2021, 05:20:46 pm
content: Once I received it .. will do the hack for sure ..Thanks a lot Sir.

author: radiolistener
author_rank: Super Contributor
timestamp: October 06, 2021, 08:47:53 pm
content: tautechDo you know if there is some kind of hardware selection for specific generator model?For example, the board which shows the best testing results is used for SDG2122X model.When test results is a little worse it is used for SDG2082X model.And all other rejected boards are used for SDG2042X model.Is it possible that there is such rejection procedure on the factory?

author: tautech
author_rank: Super Contributor
timestamp: October 06, 2021, 09:11:32 pm
content: Quote from: radiolistener on October 06, 2021, 08:47:53 pmNot that I'm aware of and in this day and age such procedures are unlikely to be necessary whereas for other gear like a bench DMM factory calibration nulls any measurement errors between PCB's.AFAIK all hacked units just perform as they should.

author: radiolistener
author_rank: Super Contributor
timestamp: October 06, 2021, 09:18:53 pm
content: Quote from: tautech on October 06, 2021, 09:11:32 pmBut there is a high speed DAC chips, they all comply with datasheet specification, but for example one chip can have better linearity than another. And this cannot be fixed with factory calibrationI hear that for one known cheap Chinese generator, the DAC904 chips are tested and worse chips are used for 20 MHz model and better chips are used for 60 MHz model.Is it possible that the same kind of selection is used for Siglent generators?

author: 2N3055
author_rank: Super Contributor
timestamp: October 06, 2021, 10:29:02 pm
content: Quote from: radiolistener on October 06, 2021, 09:18:53 pmThey don't. That kind of characterisation cost a lot of money. They simply specify DAC type that with worst case scenario pases best specs and that's it.If you get one that is better than specs, enjoy...My SDGX6000X, for instance, has much better distortion at audio frequency than specification. Spec is THD <=0.075% and I get 0.01%.

author: tautech
author_rank: Super Contributor
timestamp: October 06, 2021, 10:30:23 pm
content: Quote from: radiolistener on October 06, 2021, 09:18:53 pmMaybe, however even if linearity impacts some aspects of performance yet doesn't push performance outside datasheet spec why would it matter.QuoteThis general principle of grading PCB's has been brought up before in discussion many years back when rf-loop suspected this did happen in the now discontinued SDG1000 (not X) however study of the SDG2000X datasheet indicates there are no operational differences other than THD in this 2000 range whereas there certainly are for SDG6000X models.https://int.siglent.com/u_file/document/SDG2000X_DataSheet_DS0202X-E02E.pdfhttps://int.siglent.com/u_file/document/SDG6000X_DataSheet_DS0206X-E02B.pdfStill, like any modern instrument range that has SW limited models manufacture can be vastly simplified if all PCB's conform to the top spec model where they only need programming to a specific model and the appropriate sticker added to the front panel.