15
4. Functions and Operation
4.6 Statistic Calculation Mode
While STAT. Lamp
is on, EP-90 collects each mass value that is printed from the balance and
performs statistical calculations on these values when each set is complete.
4.6.1 Setting statistical calculation mode
Press STAT key
when STAT. lamp
is off.
STAT. lamp turns on and statistical calculation mode is entered.
(example)
(1) Press STAT key
.
(2) Place a container on the balance.
(3) Press
TARE
key
.
(4) Place the sample into the container to weigh it.
(5) Print the weighed result by pressing PRINT key
and unload the balance.
(6) Repeat (2) through (5) for the rest of samples in a set. The samples are
automatically numbered in sequence.
(7) When all the samples have been weighed, press STAT key
to print out the
result of statistical calculations for the set of samples. STAT. lamp goes off.
The results of statistic calculation are printed out in the following order.
Order in print out
Statistics
Symbol in print out
Description
1
Number of samples
N
2
Total
T
3 Maximum
MAX
4 Minimum
MIN
5
Range
RNG
= MAX – MIN
6
Mean
MEAN
= T / N
7 Standard
deviation
SD
1
N
)
MEAN
Xi
(
2
−
−
∑
