14
various harmonics, which is represented as valid value and percentage of the fundamental wave. It
represents 1-63 harmonics in tabular. You can switch tabular of (01-21) times, (22-42) times and
(43-63) of the harmonic content by ↑, ↓ keys.
Press F1 to lock the current screen for easy reading, and press F2 to continue to refresh.
Press Escape key to return to the main menu.
5. "Spectrum Analysis" Interface:
"Spectrum Analyzer" interface as shown at
right, shows the harmonic content of phase-A
voltage, phase-B voltage, phase-C voltage,
phase-A current, phase-B current and phase-C
current in histogram.
(
电能质量测试仪：
power quality analyzer
通道：
channel
按【
F1
】锁定，【上下】改变范围，【左右】换通道：
Press [F1] to lock, [up and down]
to change range, [left and right]to change channel)
The column of adjacent times of the harmonic content can be distinguished by different colors.
There are 10 colors for each group cycle. We just displayed in the histogram 32 times, for 32 or
more times harmonic can hardly be used in general. U
A
-U
B
-U
C
-I
A
-I
B
-I
C
indicates the current
measurement channel (available through ←, → keys to change the selected channel). The ordinate
scale of 0% -10% represents the percentage of each harmonic component. The fundamental
component always corresponds to 100% scale (It is amplified in display when the harmonic
component are all less than 10%, i.e. as a full scale of 10%; It is on a normal scale display when
there are more than one harmonic component greater than 10%, i.e. that is 100% as full scale). The
abscissa indicates the times of harmonics. Numbers on the right shows the total harmonic
distortion value THD, effective value and the value of 1-64 times of each harmonic (with ↑ , ↓
keys to flip). Signal with no distortion should display first harmonic (fundamental). It is tested
with Ua, Ub, Uc of the three voltage channels and Ia, Ib, Ic of the three current measurement
channels.
