Agilent Technologies E4406A Making Measurements, Using Baseband I/Q Inputs Option B7C, Chapter

Making Measurements

Using Baseband I/Q Inputs (Option B7C)

•1 M Ω Unbalanced - High input impedance is the measurement method of choice if single ended or unbalanced baseband signals to be

measured lie in a trace on a circuit board and are sensitive to loading by the probe. When making 1 M Ω measurements, the reference

input impedance may be adjusted. For details refer to “Selecting Baseband I/Q Inputs” on page 159. 1 M Ω unbalanced measurements may be made as follows:

—I only measurement using one single-ended probe connected to the I input connector

—Q only measurement using one single-ended probe connected to the Q input connector

—I/Q measurement using two single-ended probes connected to the I and Q input connectors

•1 M Ω Balanced - High input impedance measurements may also be made if differential or balanced signals are available. 1 M Ω balanced measurements may be made as follows:

—I only measurement using one differential probe or two single-ended probes connected to the I and I inputs

—Q only measurement using one differential probe or two single-ended probes connected to the Q and Q inputs

—I/Q measurement using two differential probes or four single-ended probes connected to the I, Q, I, and Q input connectors

This is the measurement method of choice if differential or balanced baseband signals to be measured lie in a trace on a circuit board and are sensitive to loading by the probe. When making 1 M Ω measurements, the reference input impedance may be adjusted. For details refer to “Selecting Baseband I/Q Inputs” on page 159.

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