Owner manual

7.6 Diagnosis
746 VA Trace Analyzer / 747 VA Stand
7-55
Attach electrode cable WE to clamping screw WE-D.
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2 diagrams are printed out and must be assessed as follows:
Segment WE-L (DCTMODE):
In principle, the plotted diagonal must be straight. Small deviations
are partly due to the resolution of the printer.
Current at voltage 200 mV: 1.6 µA ... 2.4 µA*
Current at voltage +200 mV: +1.6 µA ... +2.4 µA*
* These tolerance values refer to illustrative scatters, that is to the differences
between individual instruments. The value determined for a specific instrument
shows less scatter. The deviation depends mainly on the temperature and should
be around 10%.
Segment WE-D (AC1MODE):
A symmetrical, gaussian-shaped peak should be plotted. The
evaluation must provide a result for the peak voltage U
and the peak
current I, which are printed out at the end of the curve.
Peak voltage U : 450 mV ... 550 mV