Clamp Multimeter METRACLIP 86
English
3.14 MEASUREMENT OF THE LEVEL OF HARMONICS (THD) AND
OF THE FREQUENCY OF THE FUNDAMENTAL (NETWORK)
The device measures the total harmonic distortion with respect to the fundamental
(THD
f
) and the total harmonic distortion with respect to the true RMS value of the
signal (THD
r
) in voltage and in current. Similarly, it determines the frequency of the
fundamental by digital filtering and FFT, for network frequencies of 50, 60, 400, and
800Hz..
3.14.1 Measurement of the THD and of the frequency of the
fundamental in voltage
1.
Set the switch to
and press and hold (>2s) the
key. The
THD
f
symbol is displayed. To select
THD
r
, press the
key again.
The
THD
r
symbol is displayed. To select the frequency of the
fundamental, press the
key again. The
Hz
symbol is displayed.
2.
Connect the black lead to the
COM
terminal and the red lead to «
+
»;
3.
Place the test probes or the crocodile clips on the terminals of the
circuit to be measured;
The measurement is displayed on screen.
3.14.2 Measurement of the THD and of the frequency of the
fundamental in current
1.
Set the switch to
and press and hold (>2s) the
key. The
THD
f
symbol is displayed. To select
THD
r
, press
again. The
THD
r
symbol is displayed. To select the frequency of the fundamental,
press the
key again The
Hz
symbol is displayed.
2.
Apply the clamp to only the conductor concerned.
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