04/03
347
LB
444
62
8.1.5
Checking the Calibration
One-Point Calibration
The absorption coefficient entered under
Result a1
must remain unchanged. Also, check
the data in the following code numbers:
Display Value
Coefficient a2
0
Coefficient a3
0
Factor 1
Offset 0
Square error
0
If one of these values differs, please check your calibration.
With
negative
absorption coefficient (
Result a1
):
The count rate calculated as
zero rate I0
must be
higher
than the read-in count rate.
With
positive
absorption coefficient:
The count rate calculated as
zero rate I0
must be
lower
than the read-in count rate.
Two-Point Calibration
After calibration the following values should be displayed:
Display Value
Coefficient a2
0
Coefficient a3
0
Factor 1
Offset 0
Square error
0
If other values should be displayed, check your calibration or the data you have entered.
Multi-Point Calibration
Absorption coefficients and thus the curve function are calculated from the value pairs
entered. At the same time, a factor (square error) will be calculated (only if more than
three value pairs were entered), indicating how well the calculated curve approximates
the entered values. The lower the displayed numerical values, the better the curve fit.
The square error is a criterion for the quality of the curve fit within one curve shape. It
cannot be used as a criterion for selecting a certain curve shape. The decision for the
most appropriate curve shape for the data is made in
auto
calibration mode.
Square error value:
< 0.0005
very good calibration
< 0.0019
good
< 0.002
still useful
With larger values, check your calibration for incorrect entries.
Summary of Contents for LB 444
Page 1: ...Density Meter LB 444 Id No 32816BA2 Rev No 04 22 04 03 ...
Page 2: ......
Page 9: ...04 03 347 LB 444 VII ...
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Page 109: ...04 03 347 LB 444 99 13 4 Mounting Device 90 for Pipe Diameter 21 3 76 1 mm ...
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Page 117: ...04 03 347 LB 444 1 14 Ex Certificates for Evaluation Unit ...
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Page 120: ...04 03 347 LB 444 4 15 Ex Certificate for the Detectors ...
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