Unsuccesful binblockread with Tektronix DPO 2014

Hello,

I'm trying to run an experiment but after some time the system crashes. The measurement is performed with at Tektronix DPO2014. The problem seems to be in the binblockread() function. Based on another MATLAB answer I turned the header off. To make sure the terminator character is cleared, I also added a clrdevice(). However, I still get the following error.

Warning: Unsuccessful read: A binblock is not available to be read. 
Warning: Unsuccessful read: A binblock is not available to be read. 
Warning: Unsuccessful read: A timeout occurred before the binblock was read. 
Subscripted assignment dimension mismatch.

Error in measure (line 71)
        RawSignal(:, p) = ymult * (curve - yoff) - yzero;

Error in test (line 16)
        measure

The measure.m script:

% DPO2014 measure

if Test == 1 && Iteration == 1
    dpo2014 = visa('ni', 'USB0::0x0699::0x0373::C010615::INSTR');
    dpo2014.InputBufferSize = 10000000;
    fopen(dpo2014);

      fprintf(dpo2014, 'HEAD %s\n', 'OFF');
  end

if Iteration == 1
    RawSignals = [];
end

% Setup acquisition
fprintf(dpo2014, 'ACQ:MOD %s\n', 'AVE');
fprintf(dpo2014, 'ACQ:NUMAV %d\n', Averages);

fprintf(dpo2014, 'HOR:DEL:MOD %s\n', 'OFF');
fprintf(dpo2014, 'HOR:POS %d\n', 0);
fprintf(dpo2014, 'HOR:RECO %d\n', RecordLength);

RecordLength = query(dpo2014, 'HOR:RESO?', '%s', '%d');

for i = 1 : 4
    fprintf(dpo2014, 'SEL:CH%d?\n', i);
    active = fscanf(dpo2014, '%d');
    if active == 1       
        fprintf(dpo2014, 'CH%d:POS %d\n', [i 0]);
        fprintf(dpo2014, 'CH%d:SCA %d\n', [i 10]);   
    end 
end

fprintf(dpo2014, 'TRIG:A:TYP %s\n', 'EDG');
fprintf(dpo2014, 'TRIG:A:EDGE:SOU %s\n', TriggerSource);
fprintf(dpo2014, 'TRIG:A:EDGE:SLO %s\n', TriggerSlope);
fprintf(dpo2014, 'TRIG:A:LEV %d\n', TriggerLevel);

% Run acquisition
fprintf(dpo2014, 'ACQ:STOPA %s\n', 'SEQ');
fprintf(dpo2014, 'ACQ:STATE %s\n', 'RUN');

% Wait until the acquisition stops
fprintf(dpo2014, '%s\n', '*WAI');

% Fetch waveform
fprintf(dpo2014, 'DAT:ENC %s\n', 'SRI');
fprintf(dpo2014, 'DAT:WID %s\n', 2);

RawSignal = zeros(RecordLength, 2);
p = 1;

for k = 1 : 4
    fprintf(dpo2014, 'SEL:CH%d?\n', k);
    active = fscanf(dpo2014, '%d');
    if active == 1
        channel = sprintf('CH%d', k);

          fprintf(dpo2014, 'DAT:SOU %s\n', channel);
          fprintf(dpo2014, 'DAT:STAR %d\n', 1);
          fprintf(dpo2014, 'DAT:STOP %d\n', RecordLength);

          fprintf(dpo2014, '%s\n', 'CURVE?');
          curve = binblockread(dpo2014, 'int16');
          clrdevice(dpo2014);

          ymult = query(dpo2014, 'WFMO:YMU?', '%s', '%e');
          yoff  = query(dpo2014, 'WFMO:YOF?', '%s', '%e');
          yzero = query(dpo2014, 'WFMO:YZE?', '%s', '%e');

          RawSignal(:, p) = ymult * (curve - yoff) - yzero;

          p = p + 1;
      end
  end

RawSignals = [RawSignals; RawSignal];

if Iteration == Measurements    
    save(File, 'RecordLength', 'Averages', 'RawSignals')
    clear File RecordLength Average RawSignals    
end

if Iteration == Measurements && Stop == 1    
    fclose(dpo2014);
    delete(dpo2014);    
end

Does anybody have a suggestion to make this work?

Answer 1

[Vinod]

The CURVE? command can take some time to execute. This is likely why the BINBLOCK data is not available to read.

Rather than rewriting the SCPI code, have you tried using the Quick-control Oscilloscope functionality?

>> doc oscilloscope

for more info.