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Chapter 4 157
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.