ElektroPhysik
E-37
11. Measuring uncertainty
Careful calibration ensures precise measurement within
the range of the guaranteed measuring uncertainties
(please refer to the technical data).
For optimum mean value evaluation, we recommend to
take several measurements at the same spots. Erratic
readings can be deleted immediately by pressing
CLEAR-key.
11.1 Error sources
-
If you measure coatings thicker than provided
for your application, the de-plating area will
increase. As a consequence, measurement will
be out of tolerances. For that reason it is
recommended not to exceed the provided
measuring time interval.
-
The current efficiency variegates due to diffe-
rent de-plating speeds. We recommend to
calibrate at the same de-plating speed as set for
later measurement.
-
Impurities or alloy components in the coating
material may lead to erratic readings. If necessary,
carry out comparison measurements according
to the cross-cut method.
-
The efficiency of the solution may decrease. It
is recommended to use fresh electrolyte solution.
12. Statistics mode
All readings of a measuring series will be recorded
automatically for statistical evaluation. Ten different metal
selection memories are available to store 2000 readings
in total.
The statistics program is designed to calculate on the
basis of at least two readings the following statistical
values:
Mean value
(MEAN)
Standard deviation
(S.D.)
Variation coefficient
(Kvar)
Number of readings
(N)
Maximum single reading
(Max)
Minimum single reading
(Min)