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164 Chapter 4
Making Measurements
Using Baseband I/Q Inputs (Option B7C)
Selecting Baseband I/Q Input Impedance
The selection of input impedance is coupled to a connector “balance”
configuration. “Balance” refers to whether an input is “single-ended”
(unbalanced) or is balanced.
To select an input impedance, press
Input/Output, I/Q Setup, I/Q Input Z to
display the following choices:
•
50 Ω Unbalanced - Select to use I and/or Q input connectors.
•
600 Ω Balanced - Select to use either I and I, Q and Q, or all four I, Q,
I
, and Q input connectors.
•
1 M Ω Unbalanced - Select to use I and/or Q input connectors in an
unbalanced mode. When
I/Q Input Z is set to a 1 M Ω selection
(balanced or unbalanced)
, the setting for I/Q Z Ref for Input Z = 1M Ω
key may be adjusted. Otherwise, the default value for
I/Q Z Ref = 1 M
Ω
is 50 Ω.
•
1 M Ω Balanced - Select to use either I and I, Q and Q, or all four I, Q,
I
, and Q input connectors to make a balanced measurement. When
I/Q Input Z is set to a 1 M Ω selection (balanced or unbalanced, the
setting for
I/Q Z Ref for Input Z = 1M Ω key may be adjusted. Otherwise,
the default value for I/Q Z Ref = 1 M
Ω is 50 Ω
You can select I only or Q only in the Input/Output, Input Port menu with any
impedance selection.
Figure 4-16
I/Q Input Z Menu - Option B7C Baseband I/Q Inputs Installed