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Phase Scale Tab
To Use
Use these controls to specify the vertical
scale for spectral phase waveforms. Click
one of the Scale buttons to specify the
vertical units in radians, degrees, or as
group delay.
Behavior
Group delay unwraps and differentiates
the phase. All phase values out of the
spectral transformation are between π and
-Ï€ even though the actual phase value
may be outside this range.
Click Unwrap to work on a continuous phase function to unwrap the phase value and show the
true range. The phase unwrap begins with a phase value obtained at the first spectral sample after
DC.
The Suppression Threshold prevents random noise from making the display unusable. Any
spectral points with magnitudes less than the threshold will have phase values set to zero (degrees
or radians). To set a dB level for the suppression threshold, select dB scale from the magnitude
tab, and then set a horizontal bar cursor to the level on the magnitude spectrum. Read the dB value
from the cursor and use the multipurpose knob to enter the value as the suppression threshold.
Control Tracking Tab
To Use
Use these controls to lock two math
waveforms together. This is useful when you
want to generate both a magnitude
waveform and a phase waveform from the
same source.
Behavior
When you lock the spectral controls
together, any changes that you make to one
math waveform are also made to the other
math waveform.
You can only lock Math1 with Math2 and
Math3 with Math4.
Locking is useful, for example, when Math1 is the spectral magnitude and Math2 is the spectral
phase of the same signal. Locking forces the magnitude and phase waveforms to track if you
change the spectral controls.
Note
Math3 and Math4 are only available on 4-channel models.
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