Fluke 9118A User Manual page 85

TC1(fixed @0 mm)
TC2(test in each position from
60 mm to 0 mm)
Difference(x),
x=60,50,40,...,0 mm
4. Do steps 1 through 3 again for each position in Table 17.
After you move TC2, let the Product soak for
5 minutes.
5. Calculate the temperature difference relative to the
0 mm position for each position of TC2 in Table 17 and
record it in the table.
Difference(x) = (TC2(x) – TC1(x)) – ( TC2(0) – TC1(0))
X=0,10,..60mm
Differencep-p=Max(Difference(0),Difference(10),...,Difference(60))-
Min(Difference(0),Difference(10),...,Difference(60))
If the Differencep-p already meets the axial
uniformity tolerances, it is not necessary to make
further adjustments to the SKEW and ZONE
calibration values.
Table 17. Axial Uniformity Test with Isothermal Block
60 mm 50 mm
Note
Note
Calibration Procedure for Tube Furnace
40 mm 30 mm
6. Calculate a gradient value for the 0 mm and 60 mm
positions of TC2 with:
Gradient(x) = TC2(x) – TC1(x)
X = Position at 0 mm and 60 mm
7. Calculate the slope value with:
Slope = Gradient(60) – Gradient(0)
8. Calculate the SKEW value with:
SKEWn(new) = SKEWn(old) + A x (Slope)
9. Table 18 shows the value for A at each of the
temperature setpoints.
Calibration Furnace
20 mm 10 mm 0 mm
75