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Very slow acquisition using Matlabâ€s TMTOOL

Question asked by giannicarbone on Oct 9, 2008
Latest reply on Oct 17, 2008 by skolak
Hi,
I am using Matlab TMTOOL to control an Agilent 34401A through GPIB. It works fine, but it is very slow, it takes 0.9 s to acquire a point. I tried to double check the parameters device configuration, but I do not see any inconsistency.
Here is the configuration:

    DriverName = agilent_34401a.mdd
    DriverType = MATLAB interface object
    InstrumentModel = HEWLETT-PACKARD,34401A,0,11-5-2
    Interface = [1x1 gpib]
    LogicalName = GPIB0-22
    Name = multimeter-agilent_34401a
    ObjectVisibility = on
    RsrcName =
    Status = open
    Tag =
    Timeout = 10
    Type = multimeter
    UserData = []
    MULTIMETER specific properties:
    ApertureTime = 10
    AutoImpedance = off
    AutoRange = on
    AutoZero = on
    Bandwidth = 20
    Calibration = [1x1 iccalibration]
    DataPointsAvailable = 0
    Display = [1x1 icdisplay]
    InputTerminal = front
    Math = [1x1 icmath]
    MeasurementType = resistance
    PowerLineFrequency = 50
    Range = 10000
    Resolution = 0.01
    SampleCount = 1
    System = [1x1 icsystem]
    Trigger = [1x1 ictrigger]

And here is the code I execute
% Create a GPIB object.
interfaceObj = instrfind('Type', 'gpib', 'BoardIndex', 0, 'PrimaryAddress', 22, 'Tag', '');

% Create the GPIB object if it does not exist
% otherwise use the object that was found.
if isempty(interfaceObj)
    interfaceObj = gpib('CONTEC', 0, 22);
else
    fclose(interfaceObj);
    interfaceObj = interfaceObj(1);
end

% Create a device object.
deviceObj = icdevice('agilent_34401a.mdd', interfaceObj);

% Connect device object to hardware.
connect(deviceObj);

% Configure property value(s).
set(deviceObj, 'MeasurementType', 'resistance');
tic
for i=1:1e2
    R(i)=str2num(invoke(deviceObj, 'measure'));
    T(i)=toc;
end
disconnect(deviceObj);


Is there something wrong in my configuration or in the command I am using?
Thanks a lot.
Gianni  

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