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166 Chapter 4
Making Measurements
Using Baseband I/Q Inputs (Option B7C)
Waveform Views for Baseband I/Q Inputs
For Waveform measurements, two new displays are available
exclusively for baseband I/Q input signals; the I and Q Waveform view,
which separates the individual I and Q traces, and the I/Q Polar view.
Since the x-axis for Waveform measurements is Time, the
FREQUENCY
Channel
front-panel key has no active menu for baseband I/Q Waveform
measurements. Use
Span to change horizontal scale. A Linear Envelope
waveform view is also available to display baseband signals that
employs linear voltage units on the vertical axis.
Waveform Signal Envelope Views of I Only or Q Only
The I and Q Waveform of an I/Q signal is very different from the
complex signal displayed in the Waveform Signal Envelope view. That
is because the Signal Envelope is a product of both the I and Q
modulation waveforms.
However, an I and Q Waveform measurement of an I-only or Q-only
signal (with I only or Q only selected as the active input port) is exactly
the same signal displayed in the Waveform Signal Envelope view. That
is because an I-only or Q-only waveform determines the I-only or Q-only
signal envelope. Thus, the Waveform Signal Envelope view can be used
to measure an I-only or Q-only waveform directly.