30
elements
enabling technologies for Life Science
SECTION 3 –
Software installation and description
Note:
Acquisition Range, Sampling Rate and
Bandwidth cannot be changed while saving
data.
Note:
Be careful to disable sleep or hibernation
state in the power plan settings of your
computer when performing long-time
experiments.
When saving begins, a timer in the GUI starts and indicates the total saving time.
To stop saving, click on the “
Stop recoding
” button.
The EDR software creates a new folder in the location chosen by the user with
the same name of the saving files. In this new folder the EDR software creates
some files:
An header .txt file containing some eONE setup information (Range,
Bandwidth, etc.).
The saved data files. To limit the maximum file dimensions, the EDR
software splits the files every X minutes of acquisition selectable in the
“File
Preferences” menu. Default value is 5 minutes of acquisition.
The proprietary .dat files can be handily read by Matlab® with the included func-
tion in the
elementsRead.m
file located in the installation directory (usually
C:\\Program Files (x86)\Elements Data Reader) and in the folder where data are
saved.
Data samples are stored in 32 bit single precision format, little endian.
The elementsRead Matlab® function returns in three vectors the data, the Vc and
the acquisition time.
To load saved data, just type
[ data, vc, time ]=elementsRead;
in the Matlab®
command windows.
The data are in
pA
units if the selected range was 200 pA and in
nA
units if it was
20 nA.
Here is the
elementsRead.m
Matlab® function:
function
[ data, vc, time ] = elementsRead( )
% elementsRead
% Function to read data saved in binary format from the EDR software
%
% returns:
% data - An array of data, one channel in every column;
% vc - A vector reprensenting the command voltage Vc;
% time - The time vector;
%
% select data file
[filename, pathname] = uigetfile(
'*000.dat'
);
% check for valid data file name
if
length(filename) < 9
display(
'Error: invalid file name'
);
return
end
if
~strcmp(filename(end-7:end),
'_000.dat'
)
display(
'Error: invalid file name'
);
return
end
% read number of files and their names
basefilename = filename(1:end-8);
files = dir(strcat(pathname, basefilename,
'*.dat'
));
N = length(files);
range = 0;
% default 200 pA
OSR = 0;
% invalid OSR value
sampl = 1250000;
% default 1.25MHz sampling before decimation
PF = 0.5;
% Post Filter cut off frequency. Default = no filter
