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162 Chapter 4
Making Measurements
Using Baseband I/Q Inputs (Option B7C)
• Q Offset - Use Q Offset to input a value in Volts to offset the
measured Q value. The default value is 0.0000 Volts, the min/max
values are
± 2.5600 Volts. The tuning increment depends on the I/Q
Range
setting as shown in Table 4-9. This value only affects the
displayed results, and does not appear as a correcting voltage at the
probe.
• I/Q Input Z - This key lets you access a menu to select an input
impedance for baseband I/Q input signals. The selection of input
impedance is coupled to a connector “balance” configuration. If
I/Q
Input Z
is set to 1 M Ω, the setting for I/Q Z Ref for Input Z = 1MΩ key
becomes effective. For details, refer to “Selecting Baseband I/Q Input
Impedance” on page 164.
• I/Q Z Ref for Input Z = 1M
Ω - This key is used to select the
1 M
Ω input reference Z value in Ohms. This key is effective only
when
I/Q Input Z is set to a 1 M Ω setting. The default value is 50.0 Ω.
The value range is 0
Ω to 10 M Ω, with a tuning increment of 1.0 Ω.
For more details, refer to“Selecting Baseband I/Q Input Impedance”
on page 164.
Table 4-9 I and Q Offset Increment vs. I/Q Range
I/Q Range
I and Q
Offset
Increment
1 Volt 2 mV
500 mV 1 mV
250 mV .5 mV
125 mV .25 mV