SIGLENT SDS3034X HD rate of rise measurement

[BaNaN85]

Hi

I need some help.

I'm using the scopes automatic measurement function, looking at the 10-90% rise time measurement.

The measuement is super off. It is not showing correct at all.

A LeCroy wavesurfer is showing ~575ns 10-90% measurement which is pretty accurate compared to manually measuring with cursors.
The Siglent scope is showing 260-300ns using the 10-90%  measurement
I try to change the threshold values between % and absolute values, no difference
I change the amplitude strategy between histogram and MAX-MIN values, no difference
I go to Analysis and change the analysis gate, no difference
I go to Analysis and change the histogram gates, no difference

Also the measurement values is constantly jumping on the y-axis


This is like the most standard easy measurement and this scope can't do it

[BaNaN85]

Ok,

So I tested another scope we have, same 10-90% measurement and that one shows correct.

So I copy that ones setup to the scope showing wrong but still same. It cannot measure 10-90%.
Doing a self calibration right now....

[Martin72]

Hi,
Why not using the screenshot fumction ?

[noisyee]

That's weird.
Try to set Cursors Mode to Measure, it will show you how the measured value come from.
That may give more information to find out what's going wrong.

[BaNaN85]

Ok, after 1h selfcalibration over lunch the bad oscilloscope still showed wrong read on the rise times.

I hooked up the good one and recorded with cursors on measure on CH2 rise time.

Then I connected the bad scope and wanted to record how that ones cursor measure behaved.


After restarting the bad scope, the measurements seem to work fine...


Check pictures attached now