6100B/6105A
Users Manual
4-28
4-56. Harmonics with Side Bands
The Harmonics with Side Bands Flicker function, see Figure 4-35, allows the input
bandwidth of Flickermeters to be explored. The Fundamental frequency voltage
waveform is modulated by two frequencies simultaneously. Both frequencies are of the
same amplitude.
gdw29.bmp
Figure 4-35. Harmonics with Side Bands
Entering a harmonic number (hn) sets the harmonic frequency (fv) as a multiple of the
fundamental frequency. See Table 4-6.
An interharmonic modulating frequency fi = fv -10 Hz is also applied.
For example:
fundamental frequency = 50 Hz,
hn = 7, fv = 50 * 7 = 350 Hz,
fi = 350 - 10 = 340 Hz.
Table 4-6. Harmonics with Side Bands
120 V 230 V
Fundamental
frequency (Hz)
Starting
frequencies
(Hz)
Modulating
frequency
amplitude (V)
Fundamental
frequency (Hz)
Change to
frequency
(Hz)
Change to
voltage (V)
170 & 180 4.126 140 & 150 3.611
60
50
140 & 150 4.126
50
60
170 & 180 3.611
Flicker meter input bandwidth is the maximum fv frequency at which P
inst,max
is 1.00.
4-57. Phase Jumps
The Phase Jumps Flicker function, see Figure 4-36, causes a series of voltage channel
phase jumps over a 10-minute period. The phase jumps occur at the positive zero
crossing at 1 minute, 3 minutes, 5 minutes, 7 minutes, and 9 minutes after the end of the
settling period. The phase jump direction and size is selected by the operator at the start
of a sequence. Table 4-7 shows the expected P
st
for the different combinations of voltage,
frequency and phase jump size.
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