Vinod Cherian

NOTE: This has been tested on an Agilent 6000 series oscilloscope. Agilent 6000 series oscilloscopes return word data in unsigned integer format. Other series oscilloscopes (such as the 8000 series, for example) return word data in signed integer format.

If the waveform does not look correct in MATLAB, try changing line 76 from:

waveform.RawData = binblockread(visaObj,'uint16'); fread(visaObj,1);

TO

waveform.RawData = binblockread(visaObj,'int16'); fread(visaObj,1);

In the code Allan.m, v3.0, your calculation for modified Allan deviation uses an undefined vector, y[].

Uncommenting the lines causes 111-126 and executing your script throws an error:

.??? Undefined function or method 'y' for input arguments of type 'double'.

Error in ==> allan at 120
        z1=z1-y(L)+y(L+m(j));

first time

NOTE: Certain Agilent firmware (such as on the 54831D) may have a difference in the SCPI commands from the 6000 series. You may need to change the line in the MATLAB-file from:

fprintf(visaObj,':WAV:POINTS 5000');

TO

fprintf(visaObj,':ACQ:POINTS 5000');

Does the following code also work for agilent infiniium 54831D MSO?

Is it also possible to plot the current instead of the voltage?
fprintf (oszi, ':CHANnel1:UNITs AMPere');