Lab.gruppen PLM 20000Q - Manual (Page 23)

Operation and Performance
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PLM Series Operation Manual rev 1.2.3
5.2.2 Asymmetrical Power
The PLM models can deliver power as shown in Table 5-2 when every other channel is driven 3 dB lower
than the other. This can occur when the load on the individual power output channels within the amplifier
contain different frequency ranges.
Load Impedance (ohms) 2.0 2.7 4 8 16
PLM 10000Q
Max. Output power (Watts)
2350 2900 2400 1300 660
PLM 14000
Max. Output power (Watts)
7500 6300 4400 2300 1150
PLM 20000Q
Max. Output power (Watts)
5000 5550 4500 2300 1150
Table 5-2: Asymmetrical Load Power Ratings
5.2.3 Power Over Time
Power ratings given above are applicable for PLMs running at these levels for a period of 60 minutes. Due
to thermal considerations in the power supply and elsewhere, it is possible to draw higher power levels for
a shorter period of time. The graph below illustrates, for the example PLM 10000Q, how the rated power
figures are derived and the higher short-term capability.
Peak output voltage at “max power burst”
Figure 5-1: Power Rating Levels Over Time (PLM 10000Q)
Power ratings are based on a duty cycle of 25 ms full power every 400 ms. Between bursts, a lower signal
level applies, such that the continuous average power is 1/8th of the rated power.