Author Topic: New standard waveform-generator ?  (Read 1502 times)

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Offline SharpTopic starter

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New standard waveform-generator ?
« on: September 23, 2021, 01:34:18 pm »
Hi There

I’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 ?

Br
Sharp

 

Online tautech

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Re: New standard waveform-generator ?
« Reply #1 on: September 23, 2021, 08:10:36 pm »
Hi There

I’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 ?

Br
Sharp
Yep.
Follow your nose from here:
https://www.eevblog.com/forum/testgear/beginers-trifeta-of-bench-instuments/msg3703477/#msg3703477
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Offline SharpTopic starter

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Re: New standard waveform-generator ?
« Reply #2 on: September 23, 2021, 09:02:45 pm »
@tautech

Thank you so much  ^-^
 

Offline QLF

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Re: New standard waveform-generator ?
« Reply #3 on: October 03, 2021, 05:29:44 am »
Thanks, guys .. I am going to buy one as well :)
 

Offline SharpTopic starter

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Re: New standard waveform-generator ?
« Reply #4 on: October 03, 2021, 08:16:55 pm »
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/#msg3526004

My hack was a success
 

Offline QLF

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Re: New standard waveform-generator ?
« Reply #5 on: October 05, 2021, 05:20:46 pm »
Once I received it .. will do the hack for sure ..

Thanks a lot Sir.
 

Online radiolistener

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Re: New standard waveform-generator ?
« Reply #6 on: October 06, 2021, 08:47:53 pm »
tautech
Do 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? :)
 

Online tautech

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Re: New standard waveform-generator ?
« Reply #7 on: October 06, 2021, 09:11:32 pm »
tautech
Do 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? :)
Not 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.
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Online radiolistener

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Re: New standard waveform-generator ?
« Reply #8 on: October 06, 2021, 09:18:53 pm »
factory calibration nulls any measurement errors between PCB's

But 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 calibration :)

I 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?
« Last Edit: October 06, 2021, 09:28:12 pm by radiolistener »
 

Offline 2N3055

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Re: New standard waveform-generator ?
« Reply #9 on: October 06, 2021, 10:29:02 pm »
factory calibration nulls any measurement errors between PCB's

But 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 calibration :)

I 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?

They 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%.
 

Online tautech

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Re: New standard waveform-generator ?
« Reply #10 on: October 06, 2021, 10:30:23 pm »
factory calibration nulls any measurement errors between PCB's

But 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 calibration :)
Maybe, however even if linearity impacts some aspects of performance yet doesn't push performance outside datasheet spec why would it matter.

Quote
I 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?

This 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.pdf
https://int.siglent.com/u_file/document/SDG6000X_DataSheet_DS0206X-E02B.pdf

Still, 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.
 
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