Amprobe ACD-51HP Power-Quality-Clamp-Ons - Manual (Page 17)

ACD-51HP - ACD-56HPQ
4.3.3. Measurement of voltage harmonics (ACD-56HPQ only)
WARNING
• The maximum Voltage input is 600V. Do not attempt to take any voltage
measurements exceeding the limits indicated in this manual. Exceeding
the limits could cause electrical shock or damage to the instrument.
• Harmonic voltage measure is active for AC voltage on inputs only.
Fig. 7: voltage harmonic analysis
1. Select the “ V ” position.
2. Press FUNC key and keep it pressed at least 1 second until symbol “THD%” is
displayed.
3. Insert the red plug into V/ Ω jack and the black plug into COM jack. For ease of use,
attach the rubber test lead holster and insert a test lead (see Fig. 3).
4. Connect the test leads to the circuit under test (see Fig. 6). The instrument displays the
Total Harmonic Distortion value of the input signal. The symbol “THD%” is shown on
the display. See chapter 0 for the parameter’s definition.
5. With the H ↑ and H↓ keys you can cycle through all available harmonic values from DC
to the 25 th 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).
6. Press the FUNC key to switch to the absolute harmonics’ values displaying (from
DC to 25 th order). On the secondary display is shown the order of the harmonic whose
absolute value is displayed on the main one (ex. H3 means third harmonic).
7. If the display is difficult to read, press D-H key to hold the measured value. To disable
this function press the D-H key again.
8. If the measurement is being performed in a dark environment, press and hold the
key for 1 second to activate the backlight. It automatically turns OFF after 5 seconds.
9. Press FUNC key to escape this mode going back to voltage measurement function
(see paragraph 4.3.1).
EN - 13