Iq Waveform Measurement Concepts - Keysight X Series Measurement Manual

Concepts
MSR Measurement Concepts

IQ Waveform Measurement Concepts

Purpose
The waveform measurement is a generic measurement for viewing the input
signal waveforms in the time domain. This measurement is how the instrument
performs the zero span functionality found in traditional spectrum analyzers.
Basic mode waveform measurement data may be displayed using either a
Signal Envelope window, or an I/Q window which shows the I and Q signal
waveforms in parameters of voltage versus time. The advantage of having an
I/Q view available while making a waveform measurement is that it allows you
to view complex components of the same signal without changing settings or
measurements.
The waveform measurement can be used to perform general purpose power
measurements in the time domain with excellent accuracy.
Measurement Method
The instrument makes repeated power measurements at a set frequency,
similar to the way a swept-tuned spectrum analyzer makes zero span
measurements. The input analog signal is converted to a digital signal, which
then is processed into a representation of a waveform measurement. The
measurement relies on a high rate of sampling to create an accurate
representation of a time domain signal.
62 Keysight N9083A & W9083A Measurement Guide