Oscilloscope notshowing perfect square wave ?

[jit_singh_tara]

Dear Friends ,

I have a rigol ds1102E oscilloscope , when i tied the probe to its terminals as shown in the image , i dont get a perfect square wave which i used to get earlier . I think this is due to some weak capacitor , please suggest the reason and how to rectify.....

 

[horace1]

does the probe have an adjustment to correct the problem?

 

[Venkadesh_M]

what is the frequency? try changing coupling mode AC/ DC. also try changing triggering modes..

 

[jit_singh_tara]

Hi ,

i changed the probe attenuation factor to 1x , which was 10x earlier and it showed perfect wave .....it was my mistake . But how does it effect the waveform ?

 

[betwixt]

As suggested by Horace1, that is the classic symptom of an over-compensated x10 probe and probably nothing at all to do with the oscilloscope itself.

Do this:
1. Make sure the probe is set to the x10 position if it has a switch on it.
2. in the side of the probe you should find a small screw slot. With the display showing as it is in the photographs, turn the screw slowly and you should find it levels the top of the waveform then goes on to make the top slope the other way. The correct setting is when the top and bottom lines are horizontal.

Use a non-metalic screwdiver if possible and be very gentle, if you break it you will have to buy a new probe! They are expensive. See if there is a screwdriver packed with the probe, they are usually supplid with one.

Note that you are matching the probe to the oscilloscope, if you move it to another oscilloscope you should repeat the operation on that one too. With the compensation set incorrectly, any AC amplitude measurements you take are potentially wrong.

Brian.

 

[jit_singh_tara]

Hi betwixt ,

at 10x position , i rotated the screw as mentioned by you and it olved the problem....thx.......:grin:

 

[betwixt]

Well done!

Sometimes we look for problems when the solution is in our fingertips - literally!

Brian.