Deprag ME5000 User Manual

7
1.4.1 Machine Capability Study (Cmk)
Cmk is defined as the minimum of:
1.
s
AverageUpperLimit
C
mk
*3
−
=
or
2.
s
LowerLimitAverage
C
mk
*3
−
=
This index informs about the settling, as well as the expanded scale of the torque values.
The C
mk
- value shown below is 1.33 for a Screwdriver (this corresponds to a calculation of
the C
mk
limit values of 4 Sigma (s)).
C C
m mk
/
Limit Values
within the
Limit Values
Errors
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
*
−
IMPORTANT
The average torque should not deviate from the set value by more than 3%.
Otherwise a correct determination of the tool function index is not possible
anymore.
1.5 Functionality of the Measuring Instrument
This electronic torquemeter has been designed and constructed for the sole purpose of
monitoring Piezo-Transducers-, Strain Gauge Transducers or external Rotary Type Trans-
ducers in an industrial environment.
1.5.1 Piezo Electric Effect
The positive and negative loads of the piezo-electric effective dielectric materials are dis-
tributed unsymmetrical. Because of the molecules respectively the crystals, the center of
gravity of the positive loads does not subsidence with the negative loads. The piezo elec-
tric materials are electronically polarized.
When those materials are deformed, the dipole moment changes. On account of those
polarization changes, loads are being set free on the surface. Therefore, the piezo electric
effect can be used to obtain the load size from the measurement, which causes the defor-
mation. The freed load depends only on the deformation of the crystal and not on the
speed or the acceleration of the deformation.

Deprag ME5000 Specifications

General

Brand	Deprag
Model	ME5000
Category	Measuring Instruments
Language	English