I think there is a misunderstanding. The math data is always calculated by the windows PC, but there are 2 situations. 1. live view (the math channel data is calculated and shown from the downsampled data) this is because during live view (in all situations ?) there is only downsampled data send to ...

Looking at the data again it could also be 7N1 witch makes more sense.

As of why it is not the default 8N1 needs investigation.

can you try with
Serial.begin(115200,SERIAL_8N1);

Benno

Are you using the scope in streaming mode with this slow timebase ?

Tested this with my 3403D scope and I can not reproduce your problem.

Benno

Do you have a .psdata file.

It looks like black and blue are both math channels.

Benno

You have initialized the port with no stop bits.

See attached and fixed settings.

Benno

Some hints on setting up the right way
1st set your scope to +/- 10V instead of 5 because you have overvoltage and the decoder can have problemens with overvoltages. 2nd your signal seems te be inverted so you need to setup as shown below. Benno

Can you post the .psdata file.

Benno

You can expand the y-axis by clicking on the smal box at the bottom so if you set the scale to 10 you can see the difference
Remember this a 8 bit scope.

Benno

You can already

see bloow image.
Benno

can you post a psdata file ?

Benno

maybe you can do something with the math channels.

Benno

Yes it works only on the horizontal ruler, (time) and not on the vertical ruler (V)

What are you trying to measure on the wave ?

Benno

can you post a .psdata file where the software crashes on ?

Benno

You could mount a raspberryPi on the scope the weight of the PI is a lot less than de picoscope.
You will however need a power supply for the PI and the Scope. (5V DC)

The PI can store all recorded data on the internal SD card for evaluation.

Benno

have you looked at this post

topic14311.html

Benno