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rINSTCONTROL/@MyTds/MyTds.m
d6a8b298175cMyFit-data-scaling

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MyTds.m
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% Class for controlling 2-channel Tektronix TDS scopes.
classdef MyTds <MyScpiInstrument
properties (Constant=true)
N_CHANNELS = 2; % number of channels
POINT_NO = 2500; % number of points is fixed for this device
end
methods (Access=public)
function this=MyTds(interface, address, varargin)
this@MyScpiInstrument(interface, address, varargin{:});
% 5e3 is the maximum trace size of TDS2022
%(2500 point of 2-byte integers)
this.Device.InputBufferSize = 1e4; %byte
this.Trace.name_x='Time';
this.Trace.name_y='Voltage';
end
function readTrace(this)
%set data format to be signed integer, reversed byte order
fprintf(this.Device,'DATA:ENCDG SRIbinary');
%2 bytes per measurement point
fprintf(this.Device,'DATA:WIDTH 2');
% read the entire trace
fprintf(this.Device,'DATA:START 1;STOP %i;',this.POINT_NO);
fprintf(this.Device,'CURVE?');
y_data = int16(binblockread(this.Device,'int16'));
% Reading the relevant parameters from the scope
readProperty(this,'unit_y','unit_x',...
'step_x','step_y','x_zero');
% Calculating the y data
y = double(y_data)*this.step_y;
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;
% Discard "" when assiging the Trace labels
this.Trace.unit_x = this.unit_x(2:end-1);
this.Trace.unit_y = this.unit_y(2:end-1);
triggerNewData(this);
end
function acquireContinuous(this)
openDevice(this);
fprintf(this.Device,...
'ACQuire:STOPAfter RUNSTop;:ACQuire:STATE ON');
closeDevice(this);
end
function acquireSingle(this)
openDevice(this);
fprintf(this.Device,...
'ACQuire:STOPAfter SEQuence;:ACQuire:STATE ON');
closeDevice(this);
end
% Emulates the physical knob turning, works with nturns=+-1
function turnKnob(this,knob,nturns)
openDevice(this);
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
fprintf(this.Device,...
sprintf('HORizontal:MAIn:SCAle %i',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
fprintf(this.Device, sprintf('CH%i:SCAle %i',n_ch,sc));
end
closeDevice(this);
end
end
%% Protected functions
methods (Access=protected)
function createCommandList(this)
% channel from which the data is transferred
addCommand(this,'channel',':DATa:SOUrce','default',1,...
'fmt_spec','CH%i',...
'info','Channel from which the data is transferred');
% units and scale for x and y waveform data
addCommand(this,'unit_x',':WFMPre:XUNit','access','r',...
'classes',{'char'});
addCommand(this,'unit_y',':WFMPre:YUNit','access','r',...
'classes',{'char'});
addCommand(this,'step_y',':WFMPre:YMUlt','access','r',...
'classes',{'numeric'});
addCommand(this,'step_x',':WFMPre:XINcr','access','r',...
'classes',{'numeric'});
addCommand(this,'x_zero',':WFMPre:XZEro','access','r',...
'classes',{'numeric'});
% time scale in s per div
addCommand(this, 'time_scale',':HORizontal:MAIn:SCAle',...
'default',10E-3,...
'fmt_spec','%e',...
'info','Time scale (s/division)');
% trigger level
addCommand(this, 'trig_lev', ':TRIGger:MAIn:LEVel',...
'default',1,...
'fmt_spec','%e');
% trigger slope
addCommand(this, 'trig_slope', ':TRIGger:MAIn:EDGE:SLOpe',...
'default', 'RISe', 'val_list',{'RISe','RIS','FALL'},...
'fmt_spec','%s');
% trigger source
addCommand(this, 'trig_source', ':TRIGger:MAIn:EDGE:SOUrce',...
'default', 'AUX', 'val_list', {'CH1','CH2',...
'EXT','EXT5','EXT10','AC LINE'}, 'fmt_spec','%s');
% trigger mode
addCommand(this, 'trig_mode', ':TRIGger:MAIn:MODe',...
'default', 'AUTO', 'val_list',{'AUTO','NORMal','NORM'},...
'fmt_spec','%s');
% state of the data acquisition by the scope
addCommand(this, 'acq_state', ':ACQuire:STATE',...
'default',true, 'fmt_spec','%b',...
'info','State of data acquisition by the scope');
% Parametric commands
for i = 1:this.N_CHANNELS
i_str = num2str(i);
% coupling, AC, DC or GND
addCommand(this,...
['cpl',i_str],[':CH',i_str,':COUP'],...
'default','DC', 'val_list', {'AC','DC','GND'},...
'fmt_spec','%s',...
'info','Channel coupling: AC, DC or GND');
% scale, V/Div
addCommand(this,...
['scale',i_str],[':CH',i_str,':SCAle'],'default',1,...
'fmt_spec','%e',...
'info','Channel y scale (V/division)');
% channel enabled
addCommand(this,...
['enable',i_str],[':SEL:CH',i_str],'default',true,...
'fmt_spec','%b',...
'info','Channel enabled');
end
end
end
end
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