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Keysight Technologies
Making Droop Measurements Using the
Keysight 8990B Peak Power Analyzer

Application Brief
Introduction

Pulse droop measurement is important for testing the stability of a power amplifier's
or transmitter's output power. For example, the output power of a radar transmitter
This application note
has to be stable in order to meet the radar detection and performance specifications.
Droop measurement allows operators to monitor the stability of the transmitter power. applies to the following
products from Keysight:
The conventional solution for measuring the droop signal requires a peak power meter
that supports four markers and a delta marker. While the active marker and the delta
marker can be used to measure the droop on the radar pulse, users have to manually