Calibration
120
5 Calibration
5
.01
General information
Due to an increased quality awareness, a calibration service in the context of international
competition constantly gains signifi cance. The use of systems for quality assurance is there-
fore of equal interest both for the manufacturer and the user of testing equipment. This
leads to high customer requirements, which result from the DIN standard ISO
9000
for the
control of testing equipment.
The control of testing equipment should ensure that all testing equipment relevant for the
quality meet up to the specifi cations. For this reason testing or measuring equipment must
be calibrated, and the traceability to national standards must be possible. Physical effects
such as ageing and drift make a calibration service necessary, in order to guarantee the sig-
nifi cance of the test readings.
5
.01.01
Calibration
Calibration is an operation during which measuring equipment with an unidentifi ed error is
checked. The check is carried out by comparison with standards, the accuracy of which is
confi rmed by an offi cial test certifi cate. If , during the calibration, the readings are outside
the permitted tolerance, an adjustment is made, so that the values are within the permitted
tolerance, and the calibration is repeated.
Calibration can be carried out by anybody. In contrast to gauging, there is no
legal background for calibration.
5
.01.02
Traceability
Traceability means that when measuring equipment is tested, it must be possible to trace
the documentation of the detailed readings back to a legal standard, i.e. the recorded data is
compared with the national standard for the measured quantity.
5
.01.03
Standards
Standards are comparative testing means, which refer to one of the seven basic units of the
international standard system (SI-System). Standards must themselves be calibrated regular-
ly.
Their traceability is guaranteed by calibration or gauging certifi cates issued by DKD offi ces
(German Calibration Service) or by the Gauging Offi ce.
The PFAFF calibration system uses a weight of
500
cN =
5
N (cN = centi Newton) as “stan-
dard”, which results from the product of the weight of a body (SI-unit weight in kg = kilo-
gram) and the gravitational acceleration ( g =
9.80992
m/s
2).
In this way the physical measu-
ring unit of the thread pull in cN is traceable to the standard for weight in kilogram (Calibrati-
on certifi cate no. …., Gauging Offi ce Albstadt).
The weight used here of
0.509765
kg =
509,765
g +/-
7.5
mg corresponds to a weight of
5
N =
500
cN.
Summary of Contents for POWERLINE 3741
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