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© 2014 Proceq SA
Statistics View
PM-600
PM-630
PM-650
The Statistics View can be displayed for measurements done and stored
in one of the measurement Modes. It shows the statistical calculation of
the cover values measured.
For measurements with the Cross-Line Mode the statistical evaluation of
the cover readings is done for each layer independently. Hence there is a
Statistical View each for the scanning in the X- and Y-direction.
NOTE! In practice only the cover values and statistical evalu-
ation of the 1st layer rebars (closer to the surface) is of inter-
est.
On the horizontal axis the cover values in the unit set are displayed. The
vertical bars show the percentage of the respective cover values meas-
ured and stored. The vertical cursor bar can be moved to any cover value.
The figure on the left of the cursor bar shows the percentage of measured
cover values smaller than the cursor position. The value on the right shows
percentage of measured cover values larger than the cursor position. The
cover value is displayed at the bottom of the cursor bar and at the top the
percentage of measured covers for that cover is shown. Minimum required
cover is shown as a vertical dotted line in red (if set). Covers below the min-
imum are shown as red bars, covers above the minimum as yellow bars.
There are two different Statistics Views, the
Normal
(see Figure 15) and
the
DBV-Evaluation
(see Figure 16). Tap on the statistical values win-
dows to switch from Normal to DBV.
Statistics values box “Normal” showing Median, Mean, Number of covers measured, lowest/
highest, Standard Deviation.
Change from X- to Y-direction view (for Cross-Line Mode data only) by tapping on
/
.
The actual window is shown on top right (either of scan direction SX or SY)
Figure 15:
Statistics View Normal
The DBV-Evaluation is an evaluation of the cover readings according
to the German Concrete and Construction Association DBV (Deutscher
Beton- und Bautechnik Verein). It is also recommended by RILEM.
The DBV-Evaluation requires at least 20 cover readings. The distribution
function F(c
min
) as well as the threshold values c(5 %) and c(10 %) are
calculated. The c(x%)–values are displayed in green when the measuring
series is accepted, respectively in red if not.
