rzero
R a
R a
a
a
=
−
−
2
1
1
2
1
2
alpha
R
R
R a
R a
=
−
−
1
2
2
1
1
2
T
1-2
- Measured temperature using thermometer.
R
1-2
- Value of R from display of furnace (Press SET and DOWN at the same
time.)
where
T
1
and
R
1
are the measured temperature and resistance at 800.0
°
C
T
2
and
R
2
are the measured temperature and resistance at 1060.0
°
C
5. Program the new values for R
0
(rzero) and ALPHA (alpha) into the
instrument.
10.1.2
Accuracy & Repeatability
1. Check the accuracy of the calibrator at various points over the calibrated
range.
2. If calibrator does not pass specification at all set-points, repeat the
Calibra-
tion Procedure
.
9116A Furnace
User’s Guide
72
