39
3.12.2 Frequency Measurement (A)
1.
Set the switch to
and press the
button. The
Hz
symbol is
displayed.
2.
Select AC or AC+DC by pressing the
(yellow) button until desired
choice is reached.
3.
Clamp the jaws around the conductor to be measured.
The measured value is displayed on the screen.
3.13
MEASUREMENT OF THE TOTAL HARMONIC DISTORTION
(THD) AND DISPLAY OF THE ORDER OF HARMONICS ORDER
The device measures the total harmonic distortion with respect to the
fundamental (THDf), the total harmonic distortion with respect to the true RMS
value of the signal (THDr) in voltage and in current, then the level (with respect to
the fundamental), frequency, and RMS value of each order of harmonic.
The frequency of the fundamental is determined by digital filtering and FFT for
the network frequencies of 50, 60, 400, and 800Hz.
3.13.1 Measurement of the THD (V)
1.
Set the switch to
and press and hold (>2s) the
button. The
THD
f
,
THD
r
and
V RMS
symbols are 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.
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