Hello everyone
I've tried this simple curve tracer with my oscilliscope in the attached photo
And the circuit in the attached screenshot screenshot
, attached the oscilloscope manual also
It worked fine, and helped me in testing circuits and find fault, but my question why so much noise?, I've seen similar on YouTube, without all this noise you see at the photo of my scope
Do I miss something?, or it's the scope I use?, by the way I've tried different scale settings but that's the best I got
Anyone got similar issue?, is it possible to make it better?

 

I still use a old tracer for quick diode detector checks.
1000 diagram https://huntron.com/privatesales/technical/1000-21a-maint-info.pdf

For your noise, it looks like RFI/EMI pickup from the test leads. A bypass capacitor (RC) filter of maybe 0.1uf across the V and H connections might smooth things out.

 

I still use a old tracer for quick diode detector checks.
1000 diagram https://huntron.com/privatesales/technical/1000-21a-maint-info.pdf
View attachment 335143
For your noise, it looks like RFI/EMI pickup from the test leads. A bypass capacitor (RC) filter of maybe 0.1uf across the V and H connections might smooth things out.

My settings for scope are OK?

 

Bypass capacitor or decoupling capacitor?

 

My settings for scope are OK?

How can I tell? Post a image of a Curve trace on a typical component you used the device for.

 

Bypass capacitor or decoupling capacitor?

That's asking about the usage of the component more than the actual device.
https://components101.com/articles/...vs-bypass-capacitors-working-and-applications

 

How can I tell? Post a image of a Curve trace on a typical component you used the device for.

it's here on the right of screen, the coupling should be dc or ac or no difference?

 

That's asking about the usage of the component more than the actual device.
https://components101.com/articles/...vs-bypass-capacitors-working-and-applications
View attachment 335153

like this, between v and H?

 

There are issues with this simplistic I-V curve tracer.

1) In order to measure the current through the device accurately, you need to make the current sense resistance as low as possible. But then you are measuring very small voltages that would need amplification.

2) A simple I-V curve tracer can be useful for demonstrating the I-V characteristics of diodes. It would be much more useful if it could show the I-V curve of transistors at different base currents.

3) The I-V display is much smoother when view on an old style CRT oscilloscope.






https://forum.allaboutcircuits.com/threads/diy-i-v-curve-tracer.184368/

 

I still use a old tracer for quick diode detector checks.
1000 diagram https://huntron.com/privatesales/technical/1000-21a-maint-info.pdf
View attachment 335143
For your noise, it looks like RFI/EMI pickup from the test leads. A bypass capacitor (RC) filter of maybe 0.1uf across the V and H connections might smooth things out.

I've used capacitor 100nf between v and H and nothing happens, is there any more ideas for improving the performance and decreasing this noise?

 

I've used capacitor 100nf between v and H and nothing happens, is there any more ideas for improving the performance and decreasing this noise?

I said try the bypass connection. That usually means one end of the cap to signal V or H on individual separate caps and the other cap wire to the ground/common point connection.

 

I said try the bypass connection. That usually means one end of the cap to signal V or H on individual separate caps and the other cap wire to the ground/common point connection.

Okay, will try and let you know the result

 

I said try the bypass connection. That usually means one end of the cap to signal V or H on individual separate caps and the other cap wire to the ground/common point connection.

I've tried and so much improvements, Thank you for your help