DC100 Calibration taken using sn1-3430 quad using data from wire run 2 and coil runs 4 and 5.
Data analyzed in sigma plot file: SN1_3430 coil calibration data .JNB.  To make the strength values 
correspond to the same current the Coil strength values are corrected by multiplying by the ratio of the
the currents at which the measurements were taken.

GL (T) Coil A * (Imag wire/Imag coil) vs  GL (T) Cap linear regression

Coefficients:
b[0]	9.572166807e-4
b[1]	0.9190197262
r ²	0.9999851573

so coil constant is:

186.06 * 0.9190197262 = 170.99

GL (T) Coil B * (Imag wire/Imag coil) vs  GL (T) Cap linear regression

Coefficients:
b[0]	5.1673894527e-4
b[1]	0.9150099036
r ²	0.9999893142

186.06 * 0.9150099036 = 170.25


Another way is to perform GL/I wire / GL/I coil at each current, 
except zero and find the average of the results though this weights the points evenly, but it is a check:

Coil A coil constant calibration:
171.7539 (T/Vs) +/- 0.4884

Coil B coil constant calibration:
170.6644 (T/Vs) +/- 0.3490

Coil A & B coil constant calibration:
171.2092 (T/Vs) +/- 0.6950