Thread: Average over a specific period?

Hello gang,

I need to measure the average of a waveform over a specific period of time (like one line cycle), not the integer number of waveform periods which the DSO7104 does by default. It would be great to be able to set the X cursors to a fixed delta-T instead of having them automatically decide the period they want to average over. Is there any way to do this, short of dumping the trace data to a spreadsheet?

Thanks,
Gerrit

Gee, it only took a month to get a reply...

The scope automatically sets the averaging period to an integer number of waveform periods now. All I want is to be able to set the averaging period with the cursors too. That shouldn't require a change to the acquisition mode from whatever it is during averaging now.

My first post says DSO7104.

I can't recall if this works on a 7000, but it sure works on the new 3000X series. Try this:

1. Turn on Zoom mode (a.k.a Delayed mode) in the Timebase/Horizontal menu. This is the split-screen mode.
2. Adjust the zoom window to be the delta-X that you desire (using the Timebase scale knob). So, the lower waveform should be showing what you really wanted to measure.
3. Perform the Average measurement.

I believe in 7000, the measurement will automatically choose between measuring the full-screen waveform vs. the zoomed waveform, whichever gives a better value. In the new 3000X series, we get to choose which one to measure on, which is awesome.

You might need to update your 7000 firmware.

Hope it works, I don't have a 7000 to try out anymore, but I'm 99% sure it works that way.

--Bret

I see ... so we can only select which waveform in the 3000X series onwards ... I'll try to think of something else ...

And by the way, the library doesn't really do much (I can't recall what it is actually for) -- it is the System Version (sys7000A.jzp) that matters. It is currently at 6.16.0001 in the website now.

Thank you! It's taken a year and a half and I've long since moved on from that project, but finally here's something to work with. I also updated my scope software per a recommendation above, and dang it next time I need to do specific period averaging I'll be up to the task.

Gerrit