Ludlum Measurements 2241-2, Manual

Page: 58 / 93

Model 2241-2RK Technical Manual
Section 8
Ludlum Measurements, Inc. Page 8-17 July 2012
Enter the results of equations (9) and (10) into equation (11) to solve for
DT:
Equation 11
count
s
=
a
f
= DT
d
d
Example
s x =
x
x
= DT
6
2
6
10 4 . 8
10 1 . 31
10 2 . 26
−
−
−
Solve for f
cal
:
Equation 12
s
units
= DT) x
CORR
x
CAL
( -
CAL
= f
lo lo lo
cal
Example
s
10
x 2.14 = )
10
x 84 x 440 x
10
x (2.22 -
10
x 2.22 = f
cal
6 6 6 6
− − − −
Enter the result of equation (12) into:
Equation 13
units
count
=
f
CORR
= CC
cal
lo
and solve for CC:
Example
10
x 206 =
10
x 2.14
440
= CC
6
6
−
Enter the CC and DT values (positions 1 and 2 of the
FUNCTION
switch), derived from the equations above. Perform an R/hr calibration
as described in the previous subsection in order to ensure that the
instrument and detector have been correctly calibrated.