Bird Technologies 5010 Series-Manual - Manual (Page 14)

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In addition, 43 type elements can be used to measure
average power in signals with a peak-to-average ratio
close to 1, like a CW or FM signals. In these cases, the
average power is measured with an accuracy of +/- 5%
of full scale.
APM/DPM Elements
The APM/DPM elements are used to measure true
average power. True average power means the sensor
provides equivalent heating power of the signal,
regardless of modulation or number of carriers. These
elements can measure average power with an
accuracy of +/-5% of reading from full scale down to
2.5% of full scale.
Note:
The equivalent heating power is
dependent on the duty cycle of a signal. If a sys-
tem puts out 50 watts with a 50% duty cycle, the
APM/DPM elements will measure 25 watts.
Element Orientation
The forward element and the reflected element must
be of the same series (APM or 43). The power rating
of the forward element must be 10x the power rating
of the reverse element.
WARNING
Leaking RF energy is a potential health hazard. DO
NOT connect or disconnect equipment from the
transmission line while RF power is being applied.
Severe burns, electrical shock, or death can occur.