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MyAgilentDso.m
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Fri, Nov 15, 08:52

MyAgilentDso.m
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% Class for controlling 4-channel Agilent DSO scopes.
% Tested with DSO7034A
classdef MyAgilentDso < MyScpiInstrument & MyDataSource & MyCommCont
properties (Constant = true)
channel_no = 4 % number of channels
end
methods (Access = public)
function this = MyAgilentDso(varargin)
this@MyCommCont(varargin{:});
% 1.6e7 is the maximum trace size of DSO7034A
%(8 mln point of 2-byte integers)
this.Comm.InputBufferSize = 2e7; %byte
this.Trace.name_x = 'Time';
this.Trace.name_y = 'Voltage';
this.Trace.unit_x = 's';
this.Trace.unit_y = 'V';
createCommandList(this);
end
function readTrace(this)
this.Comm.ByteOrder = 'littleEndian';
% Set data format to be signed integer, reversed byte order,
% 2 bytes per measurement point, read the maximum
% available number of points
writeStrings(this, ...
':WAVeform:BYTeorder LSBFirst', ...
':WAVeform:FORMat WORD', ...
':WAVeform:POINts:MODE MAX', ...
':WAVeform:UNSigned OFF', ...
':WAVeform:DATA?');
% Read the trace data
y_data = int16(binblockread(this.Comm, 'int16'));
% Read the preamble
pre_str = queryString(this, ':WAVeform:PREamble?');
% Drop the end-of-the-string symbol and split
pre = str2double(split(pre_str(1:end-1), ','));
step_x = pre(5);
step_y = pre(8);
x_zero = pre(6);
y_zero = pre(9);
% Calculate the y values
y = double(y_data)*step_y + y_zero;
n_points = length(y);
% Calculate the x axis
x = linspace(x_zero, x_zero + step_x*(n_points-1), n_points);
this.Trace.x = x;
this.Trace.y = y;
triggerNewData(this);
end
function acquireContinuous(this)
writeString(this, ':RUN');
end
function acquireSingle(this)
writeString(this, ':SINGLe');
end
function stopAcquisition(this)
writeString(this, ':STOP');
end
% Emulates the physical knob turning, works with nturns=+-1
function turnKnob(this, knob, nturns)
switch upper(knob)
case 'HORZSCALE'
% Timebase is changed
if nturns == -1
this.time_scale = this.time_scale*2;
elseif nturns == 1
this.time_scale = this.time_scale/2;
else
return
end
case {'VERTSCALE1', 'VERTSCALE2'}
% Vertical scale is changed
n_ch = sscanf(upper(knob), 'VERTSCALE%i');
tag = sprintf('scale%i', n_ch);
if nturns==-1
this.(tag) = this.(tag)*2;
elseif nturns==1
this.(tag) = this.(tag)/2;
else
return
end
end
end
end
methods (Access = protected)
function createCommandList(this)
addCommand(this, 'channel', ':WAVeform:SOURce', ...
'format', 'CHAN%i', ...
'info', 'Channel from which the data is transferred');
addCommand(this, 'time_scale', ':TIMebase:SCALe',...
'format', '%e',...
'info', 'Time scale (s/div)');
addCommand(this, 'trig_lev', ':TRIGger:LEVel', ...
'format', '%e');
% trigger slope - works, but incompatible with Tektronix
addCommand(this, 'trig_slope', ':TRIGger:SLOpe', ...
'format', '%s', ...
'value_list', {'NEGative', 'POSitive', 'EITHer', ...
'ALTernate'});
addCommand(this, 'trig_source', ':TRIGger:SOUrce', ...
'format', '%s', ...
'value_list', {'CHAN1', 'CHAN2', 'CHAN3', 'CHAN4',...
'EXT','LINE'});
% trigger mode
addCommand(this, 'trig_mode', ':TRIGger:SWEep', ...
'format', '%s', ...
'value_list', {'AUTO', 'NORMal'});
addCommand(this, 'acq_mode', ':ACQuire:TYPE', ...
'format', '%s', ...
'info', ['Acquisition mode: normal(sample), ', ...
'high resolution or average'], ...
'value_list', {'NORMal', 'AVERage', 'HRESolution', ...
'PEAK'});
% Parametric commands
for i = 1:this.channel_no
i_str = num2str(i);
addCommand(this, ...
['cpl' i_str], [':CHANnel' i_str ':COUPling'], ...
'format', '%s', ...
'info', 'Channel coupling: AC, DC or GND', ...
'value_list', {'AC','DC','GND'});
addCommand(this, ...
['imp' i_str], [':CHANnel' i_str ':IMPedance'], ...
'format', '%s', ...
'info', 'Channel impedance: 1 MOhm or 50 Ohm', ...
'value_list', {'FIFty','FIF','ONEMeg','ONEM'});
addCommand(this,...
['offset' i_str], [':CHANnel' i_str ':OFFSet'], ...
'format', '%e', ...
'info', '(V)');
addCommand(this,...
['scale' i_str], [':CHANnel' i_str ':SCAle'], ...
'format', '%e', ...
'info', 'Channel y scale (V/div)');
addCommand(this,...
['enable' i_str], [':CHANnel' i_str ':DISPlay'], ...
'format', '%b',...
'info', 'Channel enabled');
end
end
end
end

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