Mask Test 2Here’s another use case for the Mask Test: Power Line Monitoring. What I show is just a simulation, assuming a x100 Probe connected to an European 230V / 50 Hz power line.
In this case we need not draw the pass/fail-mask ourselves, but let it construct automatically from a reference waveform, i.e. a pure sine without distortions and interferences plus some tolerance.
Of course, I’ve exaggerated in this example and used very tight tolerances – I guess we would get lots of mask violations in a real world power grid. But then again, this is just a demo and tolerances can be tailored to the actual conditions and requirements.
We can configure the Mask Test in several ways; one of them would be to make a screenshot for every detected mask violation. We just need to plug in some USB-stick and configure the screenshot properly, e.g. PNG format into the SIGLENT folder on the flash drive.
After setting up the Mask Test, we can have the monitoring running as long as we desire – until the USB flash drive is full. With ~36 kB memory requirement per screenshot (for PNG) we can get lots of mask violations though – that is more than 110k screenshots per Gigabyte.
Here are a few example screenshots; the violations are marked in red:
SDS824X_HD_PNG_118
SDS824X_HD_PNG_119
SDS824X_HD_PNG_120
If we have set up date and time correctly, we can see the exact date/time of the occurrence in the bottom right corner in the screenshots.
Of course, for power supply monitoring tasks, we should operate the scope from an UPS to survive a power outage, but even without that all previous mask violations are still safely stored on the USB stick.
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