FISCHER FISCHERSCOPE X-RAY XDLM 231, Operator'S Manual

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152 FISCHERSCOPE ® X-RAY
Calibration, Base Correction and Reference Measurement
18.3 Reference Measurement
18.3.1 Purpose of the Reference Measurement
A reference measurement is required in the following situations:

The report Reference Measurement required has appeared.

During the measurement device monitoring the results are beyond the tolerance limits.
During reference measurement the stability of the instrument is checked. Every instrument changes
itself in the course of time due to wear and drift. The reference measurement checks, whether or
not the state of the instrument has changed and performs corresponding adjustments, if necessary.
For the reference measurement you need the pure elements silver (Ag) and copper (Cu). These pure
elements are on the 12-item standard set delivered with the instrument.
18.3.2 Performing the Reference Measurement
If the instrument is equipped with a programmable measuring stage, you can perform the reference
measurement with automatic positioning. Otherwise perform the reference measurement with man-
ual positioning.
Before you start

The instrument must be at operating temperature before performing the reference measurement.

Perform the reference measurement at the same workplace as you will perform the measure-
ments. If you set up the instrument at another place, perform the reference measurement correc-
tion at the new place again.

To get the best results, start a measurement for 20 minutes by performing the following steps:
a Click
Display Spectrum .
b Click Go .
c Wait for 20 minutes.
Nominal value x measured s measured min. value max. value Evaluation
Cr 1.5 μm 1.51 μm 0.03 μm 1.45 μm 1.57 μm OK
Cr 0.77 μm 0.75 μm 0.02 μm 0.68 μm 0.79 μm Not OK
The calibration was successful if all re-measurements are within the respective ranges and you are
able to use the measuring application.
If a standard is outside the range, check to see of this measurement range is relevant for your meas-
uring application. If the measurement range is not relevant for your measuring application, you can
still use the measuring application.
If several re-measurements are outside the range, check the data and potential error sources. Then
perform a new calibration.
For special measuring applications, other conditions may apply for a successful calibration. How-
ever, these will be stated separately.