Products > Test Equipment
The Siglent SDG1000 and SDG800 thread
rosbuitre:
--- Quote from: Gary.M on July 14, 2015, 02:54:50 am ---I recently purchased an SGD810 and I'm very happy with it.
FYI I've posted a plot of sinewave THD at 1kHz .
The instrument used for the measurement is a Quantasylum QA400. https://www.quantasylum.com/content/Products/QA400.aspx
--- End quote ---
Very interesting the Quantasylum QA400, you could compare with something similar ?, for this price seems very complete.
Regards
Gary.M:
--- Quote from: rosbuitre on July 15, 2015, 03:46:33 pm ---
Very interesting the Quantasylum QA400, you could compare with something similar ?, for this price seems very complete.
Regards
--- End quote ---
I believe it is designed in the USA and manufactured in China. The target market was factory test of audio products in asian factories as I understand.
Its great value for the money and very capable. There is a long and informative thread in the link below...
http://www.diyaudio.com/forums/equipment-tools/231401-quantasylum-qa400.html
open loop:
--- Quote from: tautech on May 01, 2015, 08:03:47 pm ---
--- Quote from: open loop on May 01, 2015, 02:27:37 pm ---Just got a sdg1020 as a bit of a repair project, you mention old version and new version. What is the difference and what was the serial number break. Thanks for any responses :-)
--- End quote ---
Repair?
What are the fault symptoms?
Siglent products have a 3 year warranty, post all but the last 4 SN digits, from that we can tell the build date, it may still be under warranty.
--- End quote ---
Hi Tautech,
It has been several months since my last post on this case but life got in the way of me sorting out the poor old SDG 1020, unfortunately I got it non working and I see that someone made a bit of a dogs breakfast in soldering in U55 which I believe is the - 15V voltage regulator. I would doubt that Siglent would honor any warranty on this as I am not the original owner and it has had already had a go at by someone else. Anyway the serial number without the last 4 digits is: SDG0000113.
The symptom is from memory that the waveform had DC offset problems and can be all over the place and may even be clipped. I checked the power supply voltages according to the service manual and these were in specification. Interestingly the generator has a function that can set a DC output and is part of the calibration routine in the service manual. When using this the readings I get are way off and I would think that this is where I would start investigating the problems.
I am sorry that I have been vague in that I have not given any measurements or readings but I am about to start faultfinding again, will post any progress I make and any voltage readings I make :-). I am sure that the wave generation seems to be working but I would think that this an issue with the output stage given that the -15V regulator was replaced. This is why I wanted a schematic but if this is not available then fault finding will be a little more time consuming but no less fun.
Any help would be greatly appreciated.
tautech:
--- Quote from: open loop on August 18, 2015, 08:38:38 pm ---
--- Quote from: tautech on May 01, 2015, 08:03:47 pm ---
--- Quote from: open loop on May 01, 2015, 02:27:37 pm ---Just got a sdg1020 as a bit of a repair project, you mention old version and new version. What is the difference and what was the serial number break. Thanks for any responses :-)
--- End quote ---
Repair?
What are the fault symptoms?
Siglent products have a 3 year warranty, post all but the last 4 SN digits, from that we can tell the build date, it may still be under warranty.
--- End quote ---
Hi Tautech,
It has been several months since my last post on this case but life got in the way of me sorting out the poor old SDG 1020, unfortunately I got it non working and I see that someone made a bit of a dogs breakfast in soldering in U55 which I believe is the - 15V voltage regulator. I would doubt that Siglent would honor any warranty on this as I am not the original owner and it has had already had a go at by someone else. Anyway the serial number without the last 4 digits is: SDG0000113.
The symptom is from memory that the waveform had DC offset problems and can be all over the place and may even be clipped. I checked the power supply voltages according to the service manual and these were in specification. Interestingly the generator has a function that can set a DC output and is part of the calibration routine in the service manual. When using this the readings I get are way off and I would think that this is where I would start investigating the problems.
I am sorry that I have been vague in that I have not given any measurements or readings but I am about to start faultfinding again, will post any progress I make and any voltage readings I make :-). I am sure that the wave generation seems to be working but I would think that this an issue with the output stage given that the -15V regulator was replaced. This is why I wanted a schematic but if this is not available then fault finding will be a little more time consuming but no less fun.
Any help would be greatly appreciated.
--- End quote ---
Build date of your SDG1020 is Jan 2013.
Many source these units from overseas and then it is often too dificult to seek warranty repair and try then to fix units themselves which of course voids warranty.
I'm not aware of any schematics available, however IIRC there are links to imagery in this thread.
Member Lightages blew the output stage in his and sourced a new PCB direct from Siglent at his cost.
If you bought it cheaply enough it may be well worth a new PCB and then be as good as new.
If you contact them introduce yourself as an EEVblog member and I'm confident Siglent will assist.
Jade's email is in the profile of member Siglent in this thread:
https://www.eevblog.com/forum/testgear/siglent-technical-support-join-in-eevblog/
jhufford:
Maybe this isn't the proper place in the forum for this question, but I'm looking at the various Siglent arb gens. My question isn't about the 1000 or 800, but the SDG2122X.
The SDG2122X has a huge memory, and a claimed 1.2GSa/s for built in waves, but only 75MSa/S for the arb gen... But the 1000 series lists 125MSa/S with 125MSa/S for the arb gen. The 5000 series has 500 MSa/S for both built in waves and arb gen. 800 series has the same sample rate for both too.
Why such a huge difference on the 2122X? I can see where the arb gen's memory might be slower so it can't use as fast of a sample rate as the built in waves, but why would a $900 generator have 40% less arb sample rate than the $350 one, especially considering the 1000 and 5000 models have the same sample rate for both? Is the 2000 series just primarily showcasing its massive memory? Is it possible that Siglent's documentation is incorrect?
One explanation I can think of is that the Truearb eliminates jitter that DDS has had before, but at a price of a slower sample rate. Anyone?
(2nd question, the 1000 series has 7ns rise time while the 2000 has only 8.4nS, again, why would the more expensive one be less good.. Is the 1000 just a particularly good buy?)
Thanks
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