HT Instruments HT4020 Manual De Instrucciones página 46

4.3.7. Measurement of Current Harmonics (HT4022)
Before attempting any measurement disconnect all the test leads from the
circuit under test and from the meter's input terminals.
Fig. 10: Use of instrument for AC harmonic current measurement
1. Select the " " position
2. Press the FUNC/HARM key and keep it pressed at least 1 second until symbol
"THD%" is displayed
3. Open the jaws and clamp only one cable. Pay attention to the alignment marks (see §
4.1.2. and Fig. 10). The instrument displays the Total Harmonic Distortion value of the
input signal. The symbol "THD%" is displayed. See § 8 for the parameter's definition.
4. With the H and H keys you can cycle through all available harmonic values from the
st th
1 to the 25 order. On the secondary display is shown the order of the harmonic
whose percentage value is displayed on the main one (ex. h3% means third harmonic).
FUNC/HARM key to switch to the absolute harmonics' values displaying
5. Press the
st th
(from 1 to 25
whose absolute value is displayed on the main one (ex. h3 means third harmonic)
6. Press FUNC/HARM key to escape this mode going back to current measurement
function (see § 4.3.5)
order). The secondary display indicates the order of the harmonic
CAUTION
EN - 14
HT4020 - HT4022