Hach-Lange REFO 3_REFO 3D - Manual (Page 14)

Operating Instructions REFO 3 / REFO 3-D
13
C6 Statistics
In all of the three programs P1, P2 and P3 you can acquire and evaluate entire set-
off measurements with the following statistical values calculated:
•
mean value
•
standard deviation
•
coefficient of variability
For statistical evaluation of a set-off measurement, procede as follows:
•
Turn on REFO with key Meas/ON
•
Use the program key to select program P1, P2 or P3
•
Select the viewing angle for programs P1 and P2 with the angle selector key
(for program P3 the first viewing angle to be displayed)
•
Press the statistics key
•
Place REFO on the sample to measure
•
Press key Meas/ON to trigger a set-off measurement. The number of measu-
rements is indicated on the display next to the sum symbol ***.
•
With the program key you can clear the latest measurement. The display will
then indicate C... (Clear) and reduce the current number by one.
•
Press the statistics key to finish the set-off measurement
•
Display of the mean value (M)
•
Press the statistics key to call the standard deviation (S)
•
Press the statistics key to call the coefficient of variability (VK) (program P2
does not determine VK!)
Press the statistics key once more to quit the statistics function.
In the difference measurement (P2) the statistics function can be used to determine
the mean value of a set-off measurement and use it for a reference.