Deprag 385565 A, Руководство по эксплуатации, Страница: 18 / 54

18
IMPORTANT
(sys
During the acquiring of sample readings, no disruption of the tool
ce) should occur (i.e. torque adjustment). tem influen
The test is based on the Gaussian distribution curve.
σ ).
10.3.1 Tool Performance Index (C
m
)
C
m
= total specific torque tolerance of the connection: 6 Sigma (
This index indicates the expanded scale of the torque values.

* 6
LowerLimit UpperLimit
Cm


10.3.2 Tool Performance Index (Cmk)
Cmk is defined as the minimum of:
1.

* 3
Average UpperLimit
C
mk


or
2.

* 3
LowerLimit Average
C
mk


he C
mk
- value shown below is 1.33 for a Screwdriver (this corresponds to a calculation
of the C - limit values of 4 Sigma ( σ )).
e Limit Errors
This index informs about the settling, as well as the expanded scale of the torque
values.
T
mk
C
m
/ C
mk
Limit Values Within th
Values
0,30 ±  s 68,3 > 30%
0,70 ±  2s 95,4 ~ 5%
1,00 ±  3s 99,7 3 ‰
1,33 ±  4s 99,994 60 ppm
1,63 ±  4,891s 99,9999 1 ppm
1,66 ±  5s 99,99994 0,6 ppm
2,00 ±  6s 99,9999998
2 10
9
*

th
IMPORTANT
The average torque should not deviate from the set value by more
an 3%. Otherwise a correct determination of the tool function index
is not possible anymore.