Products > Test Equipment
Two Tone Test with Scope and SA
<< < (5/33) > >>
mawyatt:

--- Quote from: tautech on July 31, 2020, 10:00:00 pm ---
--- Quote from: mawyatt on July 31, 2020, 09:45:33 pm ---Thanks for running these tests again. Appears the 10 bit doesn't improve over the 8 bit performance which makes me wonder if the 10 bit is achieved with some sort of signal averaging rather than a true direct 10bit digitized result?

--- End quote ---
10 bit explanation here:
https://www.eevblog.com/forum/testgear/siglent-sds2000x-plus-coming/msg2783928/#msg2783928

That explains it, not a true 10bit but oversampled. Wonder if Siglent will extended the oversampling to 12 bits like Keysight has done?

Best,
--- End quote ---
tautech:

--- Quote from: mawyatt on July 31, 2020, 10:10:48 pm ---
--- Quote from: tautech on July 31, 2020, 10:00:00 pm ---
--- Quote from: mawyatt on July 31, 2020, 09:45:33 pm ---Thanks for running these tests again. Appears the 10 bit doesn't improve over the 8 bit performance which makes me wonder if the 10 bit is achieved with some sort of signal averaging rather than a true direct 10bit digitized result?

--- End quote ---
10 bit explanation here:
https://www.eevblog.com/forum/testgear/siglent-sds2000x-plus-coming/msg2783928/#msg2783928
--- End quote ---

That explains it, not a true 10bit but oversampled. Wonder if Siglent will extended the oversampling to 12 bits like Keysight has done?
--- End quote ---
SDS2000X Plus also has ERES of normally up to an additional 3 bits.
Check out those posts more for further info on this.  ;)

tggzzz:
If you can still get one, the Digilent Analog Discovery 2 has 14bit ADCs, AD9648
https://reference.digilentinc.com/reference/instrumentation/analog-discovery-2/reference-manual#scope_adc
joeqsmith:
doubt this will be of any help but here is my HP33120A & 2024  set to 10.0 & 10.1MHz with minicircuits splitter.

Shown on my SignalHound  in swept mode and my vintage HP3589A.     HP supports a narrow band sweep but I think this is outside of it's usable range.     

For fun also shown with the HP3589A using 10MHz and 10.0001MHz.   
David Hess:

--- Quote from: mawyatt on July 31, 2020, 09:32:48 pm ---
--- Quote from: PeDre on July 31, 2020, 07:52:46 pm ---I'm not sure I did everything right. I combined the two signals from the generator with a T-piece and terminated them with 50 Ohm on the oscilloscope.
--- End quote ---

Think you want to resistively combine the two sources for the tones unless you can combine them internally like the Siglent. A resistive "T" should work, think this has 16.7 series ohms on each leg to maintain 50 ohms on all three ports.
--- End quote ---

You have to be very careful combining the signals because the output amplifiers of the signal generators will produce the same distortion products that you are testing for if they are driven with the other signal.

Ideally a combiner which provides isolation between the input ports is required but it is usually sufficient to pad each output with an attenuator and use minimum loss resistive divider.

Update: I meant to type "minimum loss resistive combiner".
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod