convert_sidiode_volts_to_kelvin()

double DDAS3::convert_sidiode_volts_to_kelvin

(

double

volts

)

Definition at line 153 of file sigscale.cc.

References A, ND, TRANGE_100K, TRANGE_12K, TRANGE_24K, TRANGE_475K, VL, and VU.

Referenced by convert_to_display_units().

  {
    double  x, t, v, vl, vu;        
    int     i, nd, range;

    if ( volts < 0.24963 )  
      // clip value to 410K if out of range e.g.sensor unplugged
      return 410.0 ;

    // Coefficients table ends at 1.4K
    if ( volts > 1.698120 )  
      // clip value to 1.4K if out of range //changed 09/08
      return 1.40 ;

    if      ( volts > VU[TRANGE_12K] ) range = 0 ;
    else if ( volts>VU[TRANGE_24K ] && volts<=VU[TRANGE_12K ] ) range = 0;
    else if ( volts>VU[TRANGE_100K] && volts<=VU[TRANGE_24K ] ) range = 1;
    else if ( volts>VU[TRANGE_475K] && volts<=VU[TRANGE_100K] ) range = 2;
    else    /*volts<=VU[TRANGE_475K]*/                          range = 3;

    v  = volts;
    vl = VL[range];
    vu = VU[range];
    nd = ND[range];         
    x  = ((v-vl)-(vu-v))/(vu-vl);

    if ( x <= -1.0  || x >= 1.0 ) x = 0 ;  /* error condition */

    t = 0.0;
    for( i=0; i<nd; i++ )
      t = t + A[range][i]*cos(i*acos(x));

    return t;
  } // double  convert_sidiode_volts_to_kelvin(double volts)

Here is the caller graph for this function: