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7 Quick start
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Prerequisites for
analysis
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1.
Fig. 7-1
Positioning the sample (example)
2.
Choose the point of support of the hold-down device on the sample so that the sample
Information
closes the spark stand opening as tightly as possible. This is mainly the case if the point
of support is in the centre above the electrode.
If the sample is not placed correctly, there is a gap between sample and spark stand
plate so that air from outside can enter the argon-purged analysis volume (between
electrode and sample) and adulterate analysis. At the same time, the sound generated
during sparking (measurement) exits through the gap more easily. A sparking noise as
low as possible is therefore a good criterion for an optimally placed sample.
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30 Hitachi High-Tech Analytical Science
When you change the matrix (e.g. from iron to aluminium), replace electrode,
brush, ceramic insert and spark stand plate (chapter 9, page 39). Otherwise,
analysis can be falsified by a contamination on the components. Therefore, there
are a separate tungsten electrode, brush, ceramic insert and spark stand plate for
every matrix.
The spacing between electrode tip and sample surface must be set with the
electrode setting gauge (chapter 9, page 39).
For measuring samples with a diameter of < 11 mm use the measuring adapters
and the boron nitride collimator (chapter 9.11, page 50).
The instrument has been successfully put into service (chapter 6, page 27).
All other required settings have been made (see software manual).
To spark a sample (1, fig. 7-1), place it on the spark stand (2) with the prepared
side down which is as even as possible so that the spark stand opening (3) is
completely covered, if possible.
To facilitate sample adjustment, you can install an optional prism (5) on the spark
stand.
Press on the sample using the rotatable and height-adjustable hold-down
device (4) attached to the left of the spark stand.
5
3
2
4
1
2
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