FISCHER FISCHERSCOPE X-RAY 5000 Series, Operator'S Manual

Page: 119 / 188

FISCHERSCOPE
®
X-RAY 119
Calibration
16 Calibration
16.0.1 Purpose of the Calibration
A calibration is required in the following situations:

A new measuring application has been set up.

A product was imported.

If during a reference measurement 1 a deviation was encountered that is greater than
two to three times the standard deviation s.
The calibration sets the difference between nominal value and actual value to zero.

Actual value refers to the reading displayed by the instrument.

The nominal value is the value engraved on the calibration standard (engraved value).
Calibrating enables secured measurements : If the nominal values of the used standards
can be traced to recognized material measures or reference materials, then the measure-
ment is
secured through the calibration.
16.0.2 Performing the Calibration
You need calibration standards for a calibration, whose coating thickness and material
composition are known.
The standards determine the absolute value of the measurement result. For this reason
the standards have to be kept in a safe place.
Standards are only suitable, if they are stable. This means that no reactions occur
between the coatings, with the substrate or with the environment.
Before you start

The instrument must be at operating temperature before performing the calibration.

Perform the calibration at the same workplace as you will perform the measurements.
If you set up the instrument at another place, perform the calibration at the new place
again.
1. A reference measurement is a measurement on a reference sample with known properties.
Occasionally, a calibration standard may also be referred to as a calibration nor-
mal.