How to Log Continuous Peak-to-Peak Voltage Changes on an Oscilloscope?

[rwooduk]

I am trying to measure and record the change in peak to peak voltage (measured by a hydrophone) for the following experimental set-up:

As you can see the waveform in the vessel changes with vertical location, therefore I have a hydrophone connected to a motor that can adjust its position. The problem I am having is how to log the data!

My oscilloscope has logging ability (when you plug in a USB) but I'm slightly confused:

1. Initial testing shows that the oscilloscope doesn't log into one file continuously it saves a file every 10 seconds or so, there seems to be no way of controlling this? It seems to capture ONLY the waveform in that period:

Example: File 1

Example: File 2 (~10 seconds later)

2. Ideally I want to log peak to peak voltage as the measuring device changes position, is this possible?

In short, I need one file from the oscilloscope that shows how the peak to peak voltage changes when the motor is set to a set velocity (~1mm/s) and the hydrophone position changes. Has anyone done anything like this before? Any advice would be appreciated.

 

[rwooduk]

Ahh, it's ok i think i have it...

The USB host port on the front panel enables you to save your instrument settings, screenshots, and waveform data in a flash. The built-in Data Logging feature means you can set up your oscilloscope to save user-specified triggered waveforms to a USB memory device for up to 24 hours. You can also select the "Infinite" option for continuous waveform monitoring. With this mode you can save your triggered waveforms to an external USB memory device without a duration limitation until the memory device is full. The oscilloscope will then guide you to insert another USB memory device to continue saving waveforms.

So I need to set it to "infinite monitoring". Although this still won't give me average peak to peak values for each triggered waveform. In fact I don't want to trigger at all, I just want Vpk-pk versus time as the measuring devices position changes.

I'll keep trying, if there are any suggestions it would be great.