Author Topic: V-I analog signature display on KEYSIGHT DSOX1102G scope  (Read 577 times)

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Online IconicPCBTopic starter

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V-I analog signature display on KEYSIGHT DSOX1102G scope
« on: March 28, 2023, 02:17:34 am »
I am talking about setting up the scope , using the onboard sig genny, to display VI signature of components in an unpowered assembly.
Usually done with a small transformer and current sampling resistor.
The transformer  provides a floating signal and the resistor a certain maximum current.
The transformer can be replaced with a signal generator, with a floating output. At any rate galvanically isolated from the oscilloscope.

PROBLEM: the onboard signal generator shares a common ground with the oscilloscope. Other than an external transformer is there a way to set up the scope to provide this ( analog signature analysis ) functionality?
 

Online IconicPCBTopic starter

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Re: V-I analog signature display on KEYSIGHT DSOX1102G scope
« Reply #1 on: March 30, 2023, 07:59:42 pm »
No takers?
 

Offline adam4521

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Re: V-I analog signature display on KEYSIGHT DSOX1102G scope
« Reply #2 on: March 30, 2023, 08:42:26 pm »
I'm a bit puzzled about the original method if you are trying to plot non-linear components. Is there dc flowing through the transformer? Are you separately providing a DC voltage source and the generator/transformer setup provides the dynamic injection?

Does the signal generator on the oscilloscope have DC offset you can use to set a bias voltage? Would that work for you?
 

Online IconicPCBTopic starter

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Re: V-I analog signature display on KEYSIGHT DSOX1102G scope
« Reply #3 on: March 30, 2023, 10:24:05 pm »
No Adam,
No DC involved in this method.
It is a simple plot of V-I  Lissajous figure.
The problem is centred on a need for a common reference point for both the current sample ( Voltage across a resitor ) and voltage across the component or node in question.

https://www.google.com/search?channel=fs&client=ubuntu-sn&q=octopus+curve+tracer+schematic
 


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