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gradually lowered by approximately 1.2 °C per hour, taking approximately 50 hours in total. A typical
command sequence send to the Brewer during this test period is
PDFR(HP)HGSLSLDTRSAPW2TE100. The HP command is left out for single monochromator
brewers.
After the Brewer has performed the above test sequence over the whole temperature range, the
data is first analysed for operational failures and discrepancies. Special attention is given to the AP
voltages, the *oavg files and the HG wavelength calibration postion right after the FR.
Use the five F() values at all the Brewer temperature settings to determine the five temperature
response coefficients in the following five equations:
←
+
F(i)
F
(i)
TC(i)
0
where
F(i)
are the scaled, corrected count rates for slit positions 2 to 6
F
(i)
= F(i) at 0 °C
0
TC(i)
is the temperature response coeff. for the i'th operational wavelength
T
is the Brewer temperature in °C.
The values of F0(i) and TC(i) are determined by linearly regressing F(i) against T. By using the
negative of the TC(i) coefficients (as described in Compensating for Temperature under Preliminary
Data Reduction document) the wavelength-dependent temperature response of the instrument is
compensated.
Compare the TC(i) coefficients with those listed in the Final Test Manual. If the freshly determined
values do not agree with those obtained at the factory you should consult KIPP & ZONEN or EC
regarding the advisability of updating the instrument Constants File (CF command). Although the
zero-Celsius values, F0(i), are not used by the Brewer software they should be recorded for future
reference.
106
=
*
T,
i
2
to
6
MKIV OPERATOR'S MANUAL
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