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3.66
Set
SumX
SumXX
SumY
SumXY
=
=
=
=
SumX + scount
SumXX + scount2
SumY + frequency(phase)
SumXY + scount*frequency(phase)
3.67 If phase = 359, then set phase = -1.
3.68 If phase = phasestop, then set phase = 359.
3.69 Repeat steps 3.66 through 3.68 until phase = 359.
3.70 Set scount = scount – 1.
3.71 Calculate the Least Square Fit for the current data using the following equations:
M0 =
(scount × SumXY ) − (SumX × SumY )
(scount × SumXX ) − (SumX × SumX )
, B0 = (SumY × SumXX ) − (SumX × SumXY )
(scount × SumXX ) − (SumX × SumX )
3.72 If M0 > -0.000001 and M0 < 0.000001, then set done = 1.
3.73 If done = 0 and M0 ≤ 0, then set CALSTOP = CALSTOP + 5e-16,
CALSTAR = CALSTAR - 5e-16.
3.74 If done = 0 and M0 > 0 then set CALSTOP = CALSTOP - 5e-16,
CALSTAR = CALSTAR + 5e-16.
3.75 Set phase = phasestart.
3.76 Calculate the frequency using the new CALSTOP using the following equation:
Freq(phase) =
XCNTR(phase)
((YCNTR(phase) − 1) × 0.0000001) + (TECA(phase) × CALTAR ) − (TECB(phase) × CALSTOP) + (CALOFFS)
3.77 If phase = 359 then set phase = -1.
3.78 If phase = phasestop then set phase = 359.
3.79 Repeat steps 3.76 through 3.78 until phase = 359.
3.80
Set
Done
Counter
Freqsum
Freqsumplateau
=
=
=
=
0
0
0
SumXY + scount*frequency(phase)
3.81 Set phase = phasestop + 1.
3.82 Calculate the frequency of the plateau:
Freq(phase) =
XCNTR(phase)
((YCNTR(phase) − 1) × 0.0000001) + (TECA(phase) × CALTAR ) − (TECB(phase) × CALSTOP ) + (CALOFFS)
3.83 Set freqsumplateau = freqsumplateau + frequency(phase).
VM2164 Calibration and Verification
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