User Manual
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7.1.4. THE RMS DISPLAY SCREEN FOR L1
This screen displays the phase-to-ground voltage and current of phase 1.
Current and voltage axis with auto-
matic scaling.
RMS voltage and current.
Instantaneous values of the signals
at the position of the cursor.
t: time relative to the start of the
period.
V1: instantaneous phase-to-ground
voltage of phase 1.
A1: instantaneous current of phase 1.
Instantaneous value cursor. Use the
or key to move the cursor.
Figure 56: The RMS display screen for L1
Note: Filters L2, and L3 display the current and voltage in phases 2, and 3, respectively. The screen is identical to the one dis-
played for filter L1.
7.2. MEASUREMENT OF TOTAL HARMONIC DISTORTION
The THD sub-menu displays the waveforms of the signals measured over one full cycle and the total voltage and current harmonic
distortion. The levels are displayed either with the fundamental RMS value as reference (%f) or (for the C.A 8333 only) with the
RMS value without DC as reference (%r), depending on which reference is chosen in the configuration menu.
7.2.1. THE 3U THD DISPLAY SCREEN
This screen displays the phase-to-phase voltage waveforms for one period and the total harmonic distortion values.
Harmonic distortion for each curve.
Voltage axis with automatic scaling.
Instantaneous value cursor. Use the
or key to move the cursor.
Instantaneous values of the signals
at the position of the cursor.
t: time relative to the start of the
period.
U1: instantaneous phase-to-phase
voltage between phases 1 and 2
(U
12
).
U2: instantaneous phase-to-phase
voltage between phases 2 and 3
(U
23
).
U3: instantaneous phase-to-phase
voltage between phases 3 and 1
(U
31
).
Figure 57: The 3U THD display screen en 3U
7.2.2. THE 3V THD DISPLAY SCREEN
This screen displays the phase-to-neutral voltage waveforms for one period and the total harmonic distortion values.
Voltage axis with automatic scaling.
Harmonic distortion for each curve.
Instantaneous value cursor. Use the
or key to move the cursor.
Instantaneous values of the signals
at the position of the cursor.
t: time relative to the start of the
period.
V1: instantaneous phase-to-neutral
voltage of curve 1.
V2: instantaneous phase-to-neutral
voltage of curve 2.
V3: instantaneous phase-to-neutral
voltage of curve 3.
Figure 58: The 3V THD display screen