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MyDso.m
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Thu, May 30, 13:33

MyDso.m
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% Class for controlling 4-channel Agilent DSO scopes.
% Tested with DSO7034A
classdef MyDso <MyScpiInstrument
properties (SetAccess=protected, GetAccess=public)
% properties, read a a preamble during the trace reading
step_x
step_y
x_zero
y_zero
end
properties (Constant=true)
N_CHANNELS = 4; % number of channels
end
methods (Access=public)
function this=MyDso(interface, address, varargin)
this@MyScpiInstrument(interface, address, varargin{:});
% 1.6e7 is the maximum trace size of DSO7034A
%(8 mln point of 2-byte integers)
this.Device.InputBufferSize = 2e7; %byte
this.Trace.name_x='Time';
this.Trace.name_y='Voltage';
this.Trace.unit_x = 's';
this.Trace.unit_y = 'V';
end
function readTrace(this)
% set data format to be signed integer, reversed byte order,
% 2 bytes per measurement point, and also read the maximun
% avaliable number of points
fprintf(this.Device,[':WAVeform:BYTeorder LSBFirst;',...
':WAVeform:FORMat WORD;:WAVeform:POINts:MODE MAX;',...
':WAVeform:UNSigned OFF']);
% read preamble
pre_str = query(this.Device, ':WAVeform:PREamble?');
% drop the end-of-the-string symbol and split
pre = str2double(split(pre_str(1:end-1),','));
this.step_x = pre(5);
this.step_y = pre(8);
this.x_zero = pre(6);
this.y_zero = pre(9);
% read the trace
fprintf(this.Device,':WAVeform:DATA?');
y_data = int16(binblockread(this.Device,'int16'));
% Calculating the y data
y = double(y_data)*this.step_y+this.y_zero;
n_points=length(y);
% Calculating the x axis
x = linspace(this.x_zero,...
this.x_zero+this.step_x*(n_points-1),n_points);
this.Trace.x = x;
this.Trace.y = y;
triggerNewData(this);
end
function acquireContinuous(this)
openDevice(this);
fprintf(this.Device,':RUN');
closeDevice(this);
end
function acquireSingle(this)
openDevice(this);
fprintf(this.Device,':SINGLe');
closeDevice(this);
end
function stopAcquisition(this)
openDevice(this);
fprintf(this.Device,':STOP');
closeDevice(this);
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
sc = this.time_scale*2;
elseif nturns==1
sc = this.time_scale/2;
else
return
end
writePropertyHedged(this, 'time_scale', sc);
case {'VERTSCALE1', 'VERTSCALE2'}
% vertical scale is changed
n_ch = sscanf(upper(knob), 'VERTSCALE%i');
tag = sprintf('scale%i', n_ch);
if nturns==-1
sc = this.(tag)*2;
elseif nturns==1
sc = this.(tag)/2;
else
return
end
writePropertyHedged(this, sprintf('scale%i',n_ch), sc);
end
end
end
%% Protected functions
methods (Access=protected)
function createCommandList(this)
% channel from which the data is transferred
addCommand(this,'channel',':WAVeform:SOURce','default',1,...
'fmt_spec','CHAN%i',...
'info','Channel from which the data is transferred');
% time scale in s per div
addCommand(this, 'time_scale',':TIMebase:SCALe',...
'default',10E-3,...
'fmt_spec','%e',...
'info','Time scale (s/div)');
% trigger level
addCommand(this, 'trig_lev', ':TRIGger:LEVel',...
'default',1,...
'fmt_spec','%e');
% trigger slope - works, but incompatible with Tektronix
addCommand(this, 'trig_slope', ':TRIGger:SLOpe',...
'default', 'RISe', 'val_list',{'NEG','POS','EITH','ALT',...
'NEGative','POSitive','EITHer','ALTernate'},...
'fmt_spec','%s');
% trigger source
addCommand(this, 'trig_source', ':TRIGger:SOUrce',...
'default', 'AUX', 'val_list', {'CHAN1','CHAN2','CHAN3',...
'CHAN4','EXT','LINE'},...
'fmt_spec','%s');
% trigger mode
addCommand(this, 'trig_mode', ':TRIGger:SWEep',...
'default', 'AUTO', 'val_list',{'AUTO','NORMal','NORM'},...
'fmt_spec','%s');
% acquisition mode
addCommand(this, 'acq_mode', ':ACQuire:TYPE',...
'default', 'NORM', 'val_list',{'NORM','AVER','HRES',...
'NORMal','AVERage','HRESolution','PEAK'},...
'fmt_spec','%s',...
'info',['Acquisition mode: normal(sample), ',...
'high resolution or average']);
% Parametric commands
for i = 1:this.N_CHANNELS
i_str = num2str(i);
% coupling, AC, DC or GND
addCommand(this,...
['cpl',i_str],[':CHANnel',i_str,':COUPling'],...
'default','DC', 'val_list', {'AC','DC','GND'},...
'fmt_spec','%s',...
'info','Channel coupling: AC, DC or GND');
% impedances, 1MOhm or 50 Ohm works but incompatible with DPO
addCommand(this,...
['imp',i_str],[':CHANnel',i_str,':IMPedance'],...
'default','ONEMeg',...
'val_list', {'FIFty','FIF','ONEMeg','ONEM'},...
'fmt_spec','%s',...
'info','Channel impedance: 1 MOhm or 50 Ohm');
% offset
addCommand(this,...
['offset',i_str],[':CHANnel',i_str,':OFFSet'],'default',0,...
'fmt_spec','%e',...
'info','(V)');
% scale, V/Div
addCommand(this,...
['scale',i_str],[':CHANnel',i_str,':SCAle'],'default',1,...
'fmt_spec','%e',...
'info','Channel y scale (V/div)');
% channel enabled
addCommand(this,...
['enable',i_str],[':CHANnel',i_str,':DISPlay'],'default',true,...
'fmt_spec','%b',...
'info','Channel enabled');
end
end
end
end

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