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3.13. HARMonICs
This function is used to display the harmonic analysis of a voltage or current of which the signal is steady-state or quasi-steady-
state. It is used to establish a first diagnostic of the harmonic pollution of an installation.
The current analysis requires the use of the C177A current clamp (optional).
3.13.1. DEsCRIPtIon of tHE MEAsUREMEnt PRInCIPlE
The device measures the voltage and, if the clamp is connected, the current. Then, depending on what the user has chosen (FFT U
or FFT I), it performs an FFT limited to the first 50 harmonics either of the voltage or of the current. Harmonic 0 (the DC component)
is not displayed.
3.13.2. MAkInG A MEAsUREMEnt
Set the switch to
.
Connect the measuring cable terminated by 3 leads to the device and to a socket outlet of the
installation to be tested, using the red and green leads.
Or connect the C177A clamp to the device and encircle the phase.
L
N
PE
Before starting the measurement, you can configure it by modifying the parameters displayed:
Press the TEST button once to start the measurement and a second time to stop it.
To choose to perform an FFT on the voltage (U) or on the current (I).
To choose the display format for the FFT:
linear scale,
logarithmic scale,
result in the form of an alphanumeric list.
H_RMs
LIN
LOG
F
Choice of calculation of the level of distortion with respect to the fundamental (THD-F) or of the distortion factor
with respect to the RMS amplitude (THD-R or DF).
6 %
Before the measurement: to display the measurements already recorded.
During or after the measurement: to record it.
The direction of the arrow indicates whether you can make a reading (arrow pointing out) or a recording (arrow
pointing in).
The percentage indicates the quantity of memory already used.
TEST
SET UP
OFF
red
green
blue
Summary of Contents for C.A 6116
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