Hi everyone,
New member of the EEVblog here.
![Azn ^-^](https://www.eevblog.com/forum/Smileys/default/azn.gif.pagespeed.ce.7t5xC2ZH_H.gif)
I've been crawling the forums for a while and finally convinced myself into buying a Siglent SDG1020 to pair with my Philips PM3055.
It's a great device for the price, but I noticed one thing that I'm unsure whether it is to be expected or not (and I didn't find anyone else talking about it here by using the search function):
If I understood correctly, the SDG1020 declares to be able to generate a 20MHz square wave, with a 12ns rise and fall time but, while testing it, I noticed that the square wave begins to lower in quality above 5MHz; and the rise and fall time (at 10%-90%) are consistently at 20ns and not 12ns... (I will attach the pictures when possible).
Furthermore, both my oscilloscope and my V&A VA18B (low quality, I know
![Grin ;D](https://www.eevblog.com/forum/Smileys/default/xgrin.gif.pagespeed.ic.QVVz6XIT20.png)
) multimeter show that the frequency generated isn't equal to what is dialed on the Siglent by 0.5% (for example a 2kHz sinewave is measured to be approximately 1.99kHz).
Just to be clear, my oscilloscope is equipped with a 60MHz Lafayette probe (at x1 attenuation) but hasn't been calibrated in 10 years.
So, is the SDG1020 working as expected (and my analog oscilloscope showing its age) or is something wrong happening?
Thanks in advance!