Asymmetrical Power; Power Over Time - Lab.gruppen PLM series Operation Manual

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)
PLM 10000Q
Max. Output power (Watts)
PLM 14000
Max. Output power (Watts)
PLM 20000Q
Max. Output power (Watts)
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.
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.
2.0
2350
7500
5000
Table 5-2: Asymmetrical Load Power Ratings
Peak output voltage at "max power burst"
Figure 5-1: Power Rating Levels Over Time (PLM 10000Q)
Operation and Performance
2.7 4 8 16
2900 2400 1300 660
6300 4400 2300 1150
5550 4500 2300 1150
PLM Series Operation Manual rev 1.1.9
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