Panasonic gph5d User Manual

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The Sustain pulse is developed using a similar circuit as the Scan Pulse. A series 
of specifically timed pulses are applied to FET drivers creating the distinctive 
sustain pulse. The drivers switch the voltages (150V, 155V and 175V) at selected 
intervals determined by the D2 board. The basic waveform remains constant but 
the exact number of sustain pulses is determined by the amount of luminance 
required, see figure 28.