ThermoWorks 9009-B INDUSTRIAL DUAL-BLOCK CALIBRATOR - Manual (Page 42)

y
T
= ⎡
⎣⎢
⎤
⎦⎥
1
100
beta
apha x y
T
x y
delta
y
R
rzero
alph
= + − −
1
3
1
3 2
1
( )( )( ) ( )( ) ( a x y )( )( ) 3
Where:
t and r are the measured resistance at –15°C.
alpha, rzero, and delta are the new values of ALPHA, R0, and DELTA calcu-
lated above.
Program the new values for DELTA (delta), R0 (rzero), ALPHA (alpha) and
BETA (cold side only) into the calibrator with the following steps.
1. Press the “SET” and “EXIT” keys at the same time and then press
“SET” until R0 is displayed.
2. Press “SET” then use the “UP” or “DOWN” keys until the correct nu-
merical setting is displayed. Press “SET” to accept the new value.
3. Repeat step 2 for ALPHA, DELTA, and BETA (cold side only).
10.2.4 Accuracy & Repeatability
Check the accuracy of the calibrator at various points over the calibrated range.
If instrument does not pass specification at all set-points, repeat the Calibration
Procedure.
39
10 Calibration Procedure
Calibration Procedure