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analogdevicesinc / scopy

A software oscilloscope and signal analysis toolset
http://wiki.analog.com/scopy
GNU General Public License v3.0
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phasor measurements #813

Open rgetz opened 4 years ago

rgetz commented 4 years ago

There are many times where you are interested in the difference between phase magnitude between two signals, and there is specialized instruments for that, known as a Phasor Analyzer. This is typically used in teaching power systems and power electronics circuits.

https://www.labvolt.com/solutions/2_electronics/98-9063-00_data_acquisition_and_control_interface image

https://www.youtube.com/watch?v=6lSrt7Kp0lY image

It is similar to the view that we already have for the nyquist plot, so hopefully we can re-use the widget from that. image

The difference is the magnitude is just linear volts, not dB, and you are interested in showing Channel 1 and Channel 2, and measuring the difference between them. Channel 1 is always 0 degrees (as the base reference). I don't know if this is a completly separate instrument (I don't think so), handling it in the time domain view (similar to the X/Y plot) would be best (I think).

damercer commented 4 years ago

Right it is called a vector voltmeter as well. Power engineers use displays like this for relative phase between voltage and current to measure power factor in AC systems.

Doug

rgetz commented 4 years ago

yes, many are used in RF measurements as well...

For example: it's an advanced option on the KeySight 2 port analyzer, image

There is some interesting history in an Anritsu App Note

rgetz commented 4 years ago

comment from faculty was would be nice to have magnitude in Volts RMS, Volts Peak, and dB (relative to reference).