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118 Chapter 4
Making Measurements
Making the Waveform (Time Domain) Measurement
• I/Q Polar - Provides a view of the I/Q signal polar vector graph.
Figure 4-9 Waveform Measurement - I/Q Polar View
*Meas Setup: View/Trace = I/Q Polar View,
Others = Factory default settings
*Input signal in this example: cdma2000 Rev 8, SR1, 9 Channel
Changing the Display
The Sweep Time key under the Meas Setup menu controls the horizontal
time span for this measurement, while the
SPAN X Scale key allows you
to access the menu to modify the horizontal parameters common to the
rectangular windows for this measurement:
•
Scale/Div - Allows you to set the horizontal scale by changing a time
value per division. The range is 1.0 ns to 1.000 s per division with
0.01 ns resolution. The default setting is 200.0
µs per division.
However, since
Scale Coupling is defaulted to On, this value is
automatically determined by the measurement result.
•
Ref Value - Allows you to set the reference value ranging from −1.0 to
10.0 s. The default setting is 0.00 s. However, since
Scale Coupling is
defaulted to
On, this value is automatically determined by the
measurement results.
•
Ref Position - Allows you to set the reference position to either Left, Ctr
(center) or
Right. The default setting is Left.