ENGINEERING DOCUMENTATION 53
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12.24 Statistical calculations function (StAt)
Attention: Function is available on demand and it replaces other special functions.
This function evaluates from series of measurements (max 500) statistical
parameters of weighting process. Adding successively measurements to register is
automatic and it occur after the scale is loaded and its indications stabilize.
After each loading printout is made with: number of measurements, result, date
and time.
Next measurement is made after taking off earlier load.
For the obtained measurements series the scale evaluates:
- n - number of samples
- sum x - sum of all samples
=
n
xxsum _
-
x
-average value (sum x)/n
- min -minimal value from n samples
11.5 - max -maximal value from n samples
- max-min -maximal value minus minima value
- S -standard deviation
2
)(
)1(
1
∑
−
−
=
n
n
xx
n
S
- srel -variance factor
S
srel =
Statistical calculations results can be printed.
11.5
Order of operations:
1. Press MENU key.
2. When F..-StA is displayed press
→
T
←
key.
The following options are displayed:
- F..-P – statistical data printout,
- F..-0 - out of function, register zeroing, statistic data printout,
- F..-1 - enter or continue function,
3. Press
→
T
←
key when F..-1 is displayed.
4. Put on successively objects on pan, (remove after indication stabilization) in order
to add them to measurement register.
5. In order to obtain printed statistical results from measurements series press MENU
key.
When sign F..-StA is displayed, press
→
T
←
key.
When F..-P is displayed press again
→
T
←
key.
This will cause printout of calculated statistics and histogram: