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Parameter Description
For the first 40 harmonics, the following values are displayed:
Measured Value (RMS) -- The measured value displayed in the unit specified by the
harmonic unit parameter
Limit Value (RMS) -- Limits specified by the selected standard
Margin (%) --The margin specified by selected standard parameters. The margin value is
(standard value - measured value) / standard value * 100%
Pass/Fail State -- Determine whether the measured value is passed or failed according
to the selected standard. The rows in the table or the bars in the bar chart are rendered
in different colors based on the pass / fail state. When the value is greater than 85% of
the limit but less than 100% of the limit, it is defined as a critical state.
Total Harmonic Distortion（THD）=
harmonic, and X
25.4 Inrush Current
A large current far greater than the stable current may flow through at the moment of
switching on a power supply. The large current is called inrush current. The current
waveform when switching on is shown in the figure below:
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T3DSO2000A Manual. Page 152
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