This page shows a summary of how the MuTr electronics response can be, and has been parametrized, how it is being stored in Objy and how it can be accessed/used in offline or elsewhere. For the plots, I'm using calibration runs taken in the end of April'02. I use the same channels for the comparison between different versions.

Linear response [Left] ADC vs DAC for a typical channel [Right] Residuals for ~128 channels (One Station 2 FEM). (profile histogram)

[Left] Neighboring bin difference (ADC counts) vs DAC for the same typical channel [Right] For all channels in the same fem (box plot).

If we move on to higher DAC values, or look at Station 3, which has a higher gain, we will approach the region where the preamp saturates, giving rise to a linear trend in the difference between neighboring bins. The saturation appears to kick in at about 1600 ADC counts. (You see a hint of it in the plots above at the high DAC end also) The corresponding DAC value is stored as a parameter named Saturation. The slope of the difference between bins at these rather high DAC values is stored as LinSat, which is also a free parameter during the fitting. The relation between DAC and ADC values, and the difference between neighboring bins for a station 3 FEM is shown below (as before: the markers indicate the mean and error of the mean):

The different extra parameters I described in the previous section are named: Center, SqrLow, SqrHigh and LinSat respectively.
The variable Status is used to describe how the fitting worked (-999 = not fitted, 0 = good, 1000 = refit needed with a fixed center, 1000 + XYZ = failure, XYZ is a bit code of which parameters that hit the limits). Step tells us which size of steps are supposed to be used in the getAdc(dac) and getDac(adc) methods. Having these methods accept and return floats would perhaps have been convenient but I just couldn't bring myself to do that. I/O is handled via standard iostreams.

void test(const char *infile = "in.txt", 
	  const char *outfile = "out.txt")
{
  
  cout << "starting...." << endl;
  // load the shared libraries
  gSystem->Load("libvtx.so");
  gSystem->Load("libmut.so");
  cout << "libraries loaded..." << endl;

  MutCalibStrip *cobj = new MutCalibStrip();

  // ASCII I/O
  cobj->txtGetAll(infile); // infile must match what PdbMutCalibStrip expects to read
  cobj->txtPutAll(outfile);

  cout << "trying to get hold of a real strip" << endl;
  PdbMutCalibStrip *p2 = cobj->getPdbMutCalibStrip(0,0,0,0,0,0,1);

  cout << "did we get it?" << endl;
  if (p2) 
    {
      p2.print();
      cout << "changing pedestal value" << endl;
      p2.set_pedestal(999.999);
      p2.print();
    }
  //  cobj->putPdbMutCalibStrip(p2); // needed to change value in set

  cout << "Id and name: " << endl;
  int uniqid = p3.getUniqueId(); // bit packed, used for automatic sorting in set
  cout << hex << uniqid << dec << endl;

  char *name = "muTr_ArmX_StaY_OctZ_HOctW_GapI_PlaneJ_StripK";
  bool nameok = p3.getName(name);
  cout << name << endl;

  int nstrips = cobj->getNumberOfStrips();
  cout << "nstrips = " << nstrips << endl;
 
  delete cobj;
}

The following macros can be used for putting stuff into the database or retrieving it, respectively. You probably want to change the timestamps and the descriptive string for your use, though.

void dbputall(const char *infile = "in.txt") 
{
  cout << "starting...." << endl;

  // load the shared libraries
  gSystem->Load("libvtx.so");
  gSystem->Load("libPdbCal.so");
  gSystem->Load("libmut.so");
  cout << "libraries loaded..." << endl;

  MutCalibStrip *cobj = new MutCalibStrip();

  cobj->txtGetAll(infile);

  PHTimeStamp start(2002,04,28,15,0,0); 
  PHTimeStamp stop(2002,04,29,16,0,0); 
  PHString descriptor("DS - test calibration");

  cout << "start: " << start << endl;
  cout << "stop: " << stop << endl;
  cout << "descriptor: " << descriptor << endl;;

  cobj->dbPutAll(start, stop, descriptor);
 
  delete cobj;
}

void dbgetall(const char *outfile = "outdb.txt")
{  
  cout << "starting...." << endl;
  // load the shared library
  gBenchmark->Start("test");

  gSystem->Load("libvtx.so");
  gSystem->Load("libPdbCal.so");
  gSystem->Load("libmut.so");
  cout << "libraries loaded..." << endl;

  MutCalibStrip *cobj = new MutCalibStrip();

  PHTimeStamp tsearch(2002,04,29,0,0,0); 

  cout << "tsearch: " << tsearch << endl;

  cobj->dbGetAll(tsearch);
  cobj->txtPutAll(outfile);
 
  delete cobj;
  gBenchmark->Show("test");
}