Teledyne 238 - Thermal conductivity analyzer - Manual (Page 36)

TELEDYNE BROWN ENGINEERING
Analytical Instruments
4-18
4 Linearizer Model 235
5. Make V
in
= V
test
(2) per chart. This is the second
breakpoint voltage. Adjust P2 until V
out
= V
lin
(2).
6. Continue up each line segment, repeating the procedures
of the sections just covered, using pots P3, P4, P5, P6,
P7, and P8, to linearize line segments 3, 4, 5, 6, 7, and 8.
7. Repeat the calibration against known samples, and verify
that the values obtained at various concentrations are
linearly displayed.
8. If the linearity is not quite satisfactory, determine which
line segment requires touch-up. If more than one
segment is not properly adjusted, readjust the segment
closest to zero first. All other following segments must
be toucned up, since they are affected by the former one.
If results are still not satisfactory, re-evaluate the
breakpoints. Change their positions on the curve as
required by installing different values for breakpoint
resistors. Repeat the line segment trimpot adjustment
procedures as outlined in the above sections.