39
40
Figure 22
User can press
key to increase harmonic order or press
key to reduce harmonic order. It
also will display effective value of various voltage harmonic components correspondingly.
8.3
Voltage harmonics
It will measure and display effective value of various harmonics of single-phase voltage to
fundamental wave distortion rate, harmonic order and corresponding orders of harmonic
voltage for load of three-phase four-wire system.
Measurement steps: Press HARM key to enter into measurement mode of voltage harmonic
components after bootstrap and connect voltage signal of measured phase to voltage input end
of instrument by probe and connect zero wire to COM end. As shown in Figure 20, connect
phase wire to any port of V1/V2/V3 and press SELECT key so that measurement port can be
consistent with input port. As shown in Figure 23, LCD will display current harmonic order (with
auxiliary display in left lower corner), effective value of harmonic voltage (with main display in
the middle) and percentage of effective value of harmonic component for effective value of
fundamental wave (with auxiliary display in right lower corner) respectively.
Figure 23
User can press
key to increase harmonic order or press
key to reduce harmonic order. It
also will display effective value of various voltage harmonic components and percentage for
fundamental wave correspondingly.
8.2
Total voltage harmonics for fundamental wave distortion rate
It will measure and display effective value of total harmonics of single-phase voltage to
fundamental wave distortion rate, harmonic order and corresponding orders of harmonic
voltage for load of three-phase four-wire system.
Measurement steps: Press HARM key to enter into measurement mode of total voltage
harmonics to total wave distortion rate firstly after bootstrap and connect voltage signal of
measured phase to voltage input end of instrument by probe and connect zero wire to COM
end. As shown in Figure 20, connect phase wire to any port of V1/V2/V3 and press SELECT
key so that measurement port can be consistent with input port. As shown in Figure 22, LCD
will display current harmonic order (with auxiliary display in left lower corner), total voltage
harmonics for full wave distortion rate (with auxiliary display in right lower corner) and effective
value of harmonic voltage (with main display in the middle) respectively.
UT241/242/243 OPERATING MANUAL
UT241/242/243 OPERATING MANUAL
