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Component tester with I(U) diagram?

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ebastler:
Some old scopes, e.g. the Hameg HM604, have a simple built-in component tester: It applies a 24 Vpp sine voltage to the DUT in series with an internal resistor, and displays an X/Y plot with the applied voltage on the horizontal axis and the voltage over the resistor (i.e. the current flowing through the DUT) on the Y axis.

Quite handy e.g. for a quick check whether a diode still has its expected behaviour. Some in-circuit tests take a moment's thought, but the manual helps with that -- see the attached diagrams.

It's obviously possible to rig up something like this as an external scope attachment (or to get a proper curve tracer which does this with more flexibility). But I like the simple, always-ready, no-messy-cables built-in tester. Hence I am wondering:

* Are there still (modern) scopes which offer this option?
* Any small, self-contained gadget you have come across and can recommend? This should be easy to do with a microcontroller and small graphical display, since it does not require high sampling rate and bandwidth.

tautech:

--- Quote from: ebastler on September 23, 2024, 05:43:59 am ---Some old scopes, e.g. the Hameg HM604, have a simple built-in component tester: It applies a 24 Vpp sine voltage to the DUT in series with an internal resistor, and displays an X/Y plot with the applied voltage on the horizontal axis and the voltage over the resistor (i.e. the current flowing through the DUT) on the Y axis.

Quite handy e.g. for a quick check whether a diode still has its expected behaviour. Some in-circuit tests take a moment's thought, but the manual helps with that -- see the attached diagrams.

It's obviously possible to rig up something like this as an external scope attachment (or to get a proper curve tracer which does this with more flexibility). But I like the simple, always-ready, no-messy-cables built-in tester. Hence I am wondering:

* Are there still (modern) scopes which offer this option?
* Any small, self-contained gadget you have come across and can recommend? This should be easy to do with a microcontroller and small graphical display, since it does not require high sampling rate and bandwidth.
--- End quote ---
Mike has a couple of threads that might be of interest:
https://www.eevblog.com/forum/testgear/fooln-around-with-dso-awg/
https://www.eevblog.com/forum/projects/dso-awg-based-curve-tracer/

ebastler:

--- Quote from: tautech on September 23, 2024, 06:42:45 am ---Mike has a couple of threads that might be of interest:
https://www.eevblog.com/forum/testgear/fooln-around-with-dso-awg/
https://www.eevblog.com/forum/projects/dso-awg-based-curve-tracer/

--- End quote ---

Thanks! Mike's schematic will be most helpful in case I end up building something myself. 

Mike's design is approaching the "connect a proper curve tracer to a scope externally" end of the spectrum. I was hoping that something simpler, but with a built-in display, might be available -- either as a complete product or as a documented DIY project. For a simple component tester, less control over the measurement conditions would probably be ok. (Although, compared to the old Hameg tester, one would at least want an alternate setting which applies a lower voltage to the DUT.)

Aldo22:
You mean something like this but "built-in"?

https://youtu.be/kEuixDsiCW0?t=1413

ebastler:

--- Quote from: Aldo22 on September 23, 2024, 08:19:29 am ---You mean something like this but "built-in"?

https://youtu.be/kEuixDsiCW0?t=1413

--- End quote ---

Yes, that's the principle. The old Hameg scopes had it built in (including a simple signal source derived from the 50 Hz supply).

I am not aware of a modern scope which includes something like this, but was hoping to find a simple gadget which includes signal source, LCD and two probe connections. Since the signal frequency is just 50 Hz (maybe switchable to a bit higher, to check small capacitors), any microcontroller with ADC and DAC should be enough for driving this.

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