Bird Technologies 5010 Series-Manual - Manual (Page 13)

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Chapter 1 Introduction
Description
The DPS series sensors utilize elements in order to
make power measurements. Each element has an arrow
on it that represents the direction in which it measures
power. The elements ignore power in the opposite
direction with a directivity of at least 25 dB. The DPS
series can make power measurements using either 43
type or APM/DPM elements, and the readings available
vary, based on which elements are being used.
Since the DPS uses two elements, it can measure the
quality of the system by comparing the forward and the
reflected power. This is usually presented in the form
of VSWR (voltage standing wave ratio) or Return Loss.
Element Types
43 Type Elements
The 43 type elements are normally used to measure
peak power. These elements can measure the peak
power of a system with an accuracy of +/-8% of full
scale as long as the signal meets the following
requirements:
z At least 15 pps (pulses per second)
z Minimum pulse width of 15 µs (800 ns if
frequency is greater than 100 MHz)
z Minimum Duty Cycle of 0.01%