Can someone give instructions how to test ATMEL/Arduino clocks (8/16Mhz) with this scope. Another thing I need it for is to check square/true sine wave of 230V AC inverter (if its even possible with 2x25MHz).
Hi,
Unless I'm misreading your questions, it sounds as if you are firstly looking for a decent basic primer on DSO usage. This thread (despite its title) has turned into a very useful one, covering pretty much all aspects of scope usage, with many experienced members contributing...
https://www.eevblog.com/forum/beginners/what-an-oscilloscope-recommended-for-a-woman-passionate-about-electronics/Regarding your specific questions:
Testing Arduino clocks should be no difficulty. It's simply a matter of attaching the probe ground clip to the Arduino 0V rail and probing the appropriate signal. I suggest initially writing a simple script to toggle an I/O pin at a defined rate while becoming familiar with the controls. If you are talking about actually monitoring the crystal on the board, then you need to be more careful of loading effects - Ensure that the scope probe is set to X10 for minimum resistive and capacitive loading and probe the crystal directly. Set the probe attenuation (referred to as 'Probe rate') in the channel menu to X10 too so that voltage readings will come out correctly. You will find that one side of the crystal (the driven side) will have a larger and more stable waveform. You should be able to get a reasonable clock waveform with the scope's bandwidth.
With regard to the 230V inverter. Assuming that it is a small inverter, supplied from a low voltage DC source. You should have no problem - however 230V is quite high - You
must ensure that the probe stays in the X10 position at all times (it's normal to avoid the X1 setting for general measurements anyway, so get into the habit). At X1, 230V will damage the scope input. Ensure that the probe ground clip is attached to the 0V side of the inverter output (the ground clips are connected to the metal case of the scope).
From your PM I think you have the VDS1022
I galvanically isolated version (there is no 'L' variant - the LAN port is only available on higher spec models). This means that the USB interface (and so your PC) is protected from the effects of small voltages on the ground clips. This doesn't mean that you don't need to worry about where you connect the probe ground clip (as mentioned above, the scope case will follow the ground clip voltage, as will the ground clip on the other channel!).
Hopefully I have understood your description of the 230V AC inverter correctly. If it is something bigger and more high power and dangerous, or directly mains connected, then you need the appropriate too for the job (a high voltage differential probe). Don't be tempted to probe the mains directly.
If you don't want to worry about all of the settings at the moment (you do need to set the probe attenuation in the Channel menu manually), then the Autoset button actually works quite well to get you a stable waveform under most circumstance. You will want to become familiar with the settings as soon as possible though. All of the measurement functions can be found in the measurements menu.
Adopting the Florentbr version of the software (
https://github.com/florentbr/OWON-VDS1022 ) will yield benefits too, but is not essential to first use of the scope.