Products > Test Equipment
Sigkent SDG2000x time base accuracy
Zenith:
It's in one of the service manual revisions but I couldn't find it in the current one.
See here
https://www.eevblog.com/forum/testgear/the-siglent-sdg2042x-thread/msg1243552/#msg1243552
Connect 10MHz from your GPSDO to the counter input, set the AWG to counter mode and make sure it works. It's probably best if the AWG has been left on to warm up for at least 10 minutes.
Then Utility=>System=>page 2=>System Info=>123654=>Time Base Calibration.
Then you can alter the DAC code to tune the frequency.
There's a frequency display on that screen but it's a bit coarse unless you are really far out.
Then Accept and back into counter mode to check. Rinse and repeat until you get it as close as you can. You could also check the AWG output with a scope and GPSDO or a counter with an external reference.
There's also an Auto Set when you get to the screen with the DAC code. I tried it and it didn't seem to do much. I altered the DAC code.
When I bought my SDG2000X a few months back it was within about 0.4 ppm, which is well within the maker's spec. After calibrating the timebase it's less than 0.01ppm. It will be interesting to see how long it stays there.
0.4ppm is pretty good and enough for just about anything I want to use it for with its internal clock. Being able to adjust it to less is gratifying.
NoisyBoy:
Interesting catch, I just noticed they pulled the entire section on calibration and adjustment off the latest release of the service manual, all there's left is the performance verification, which is unfortunate. As calibration and adjustment is perhaps the section most people would use on an annual basis.
hpw:
--- Quote from: NoisyBoy on March 02, 2023, 07:09:11 pm ---Interesting catch, I just noticed they pulled the entire section on calibration and adjustment off the latest release of the service manual, all there's left is the performance verification, which is unfortunate. As calibration and adjustment is perhaps the section most people would use on an annual basis.
--- End quote ---
May one chance https://www.batronix.com/files/Siglent/Funktionsgeneratoren/SDG2000X/SDG2000X_ServiceManual_EN.pdf
Below the pictures of that page O;)... about the DAC code, it is a mystery...
Zenith:
My DAC code was 16281 when I started and I found 16326 was the best value, compared against the GPSDO. I'm slightly surprised it wasn't better adjusted in the factory. It did take a good 20 minutes of messing about to get it right. Maybe that's why.
As the DAC code increases, the reference frequency decreases. Once, I miss-keyed it as 1632 and the reference frequency was far too high. I expect you can run out of adjustment with old units as with OCXOs.
All you have a right to expect is that it's within 1ppm and it will age to within 3.5ppm in ten years, and no more. For most things you'd use a function generator for, that's pretty damned good. If it's not up to your exacting standards, you can use an external reference.
Your mileage may vary of course. I may have a particularly good TCXO - so far.
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