33
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 the Frequency of the
Fundamental (V)
1. Set the switch to
and press and hold the
button for (>2s). The
THD
f
symbol is displayed. To select
THD
r
, press the
button again.
The
THD
r
symbol is displayed. To select the frequency of the
fundamental, press the
button again. The
Hz
symbol is displayed.
2. Connect the black lead to the
COM
terminal and the red lead to the “
+
”
terminal.
3. Place the test probes or the alligator clips on the terminals of the circuit
to be measured.
The measurement is displayed on screen.
3.14.2 Measurement of the THD and the Frequency of the
Fundamental (A)
1. Set the switch to
and press and hold the
button for (>2s). The
THD
f
symbol is displayed. To select
THD
r
, press the
button. The
THD
r
symbol is displayed. To select the frequency of the fundamental,
press the
key again. The
Hz
symbol is displayed.
2. Clamp the jaws around the conductor to be measured.
Summary of Contents for 205
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