Frequency Measurement (A); Measurement Of The Total Harmonic Distortion (Thd) And Display Of The Order Of Harmonics Order; Measurement Of The Thd (V) - AEMC 407 User Manual

3.12.2 Frequency Measurement (A)

1. Set the switch to
displayed.
2. Select AC or AC+DC by pressing the
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
THD , THD
f
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.
and press the
and press and hold (>2s) the
and V RMS symbols are displayed.
r
button. The Hz symbol is
(yellow) button until desired
39
button. The