Operating Modes
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5.3.2 Course of the Measurement
Once all the settings have been made, the measurement can be started with the menu
item . An instruction is then given in respect of the first phase to be connected (the
smallest selected phase of the phase selection), which requires confirmation.
After which 10 seconds remain to enable high voltage with the “HV On” button . As
soon as high voltage is enabled, the “HV Off” button lights up red signalling high
voltage at the HV output.
At the start of the measurement, load detection is performed. If the capacitance of the
cable requires a reduction in the test frequency that has been set, this is indicated on
the screen by a system message. The user can then either cancel the test or start it
using a different frequency.
Alternatively, the number of voltage levels could be reduced, resulting in an automatic
drop in the maximum necessary test voltage. However, care should be taken here to
ensure that, if possible, the 3 voltage levels required for meaningful measurement
results are retained.
The test voltage runs through the selected number of voltage levels during the course of
the measurement and remains at a voltage level for the selected number of measured
values.
The system requires a certain number of periods (approximately three) at the start of
each new voltage level in order to optimally adjust itself for the current and voltage
values. During this phase, no tanδ measured values are displayed.
Selecting the menu item allows you to switch between two different views. In the
curve representation, the measured individual tanδ values (green dots) together with the
corresponding RMS voltage values (blue dots) are displayed in a diagram.
The display area of the diagram can be increased or be reduced by means of the menu
item . In the tabular view, the last 4 individual tanδ values are numerically listed with
the corresponding voltage level.
measurement
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