How can I save a useful CSV file from DSO Nano V3

Products & Technology DSO Nano
#1

My new Nano has options to save BMP, CSV, and other formats. The BMP works and looks like the screen, but of course resolution is limited. I hoped to get more detail from a CSV file. I was able to write one to the internal memory and view it on my computer.

The problem is that the file is just a single column of 4094 integer values ranging from 128 to 130.

I am looking at an I2C SCL signal, so there is a lot of time at 5V with brief drops to 0V in bursts. That is what I am trying to capture, and I can’t even tell if the CSV is related to the data.

Any suggestions? Maybe I’m making a beginner error, or maybe there’s a whole different approach I should be using.

By the way, the V3 I have does not have an SD slot as is often mentioned here. It stores to internal memory. Does that matter?

Steve

#2

The CSV file is unfortunately undocumented. You can try the following:

Conversion constants:
Hcr = 30 [Spl/Div] Horizontal conversion constant.
Vcr = 25 [ADC/Div] Vertical conversion constant

Settings:
Hscale [sec/div] … horizontal deflection factor
Vscale [V/div] … vertical deflection factor

Values from CSV file:
Nspl … Number of data points horizontal (usually a difference value!)
Wadc … Data value (usually a difference value!)

From this to physical quantities:
T[sec] = Nspl/Hcr*Hscale
U[V] = Wadc/Vcr*Vscale

Robert

Edit: Vcr = 22.4 --> 25 [ADC/Div]
Vcr=22.4 contains my gain error correction. Use Vcr=25 if you don’t know the gain error of your device.