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41 SNA5000A Vector Network Analyzer User Manual
A phase:
• Same phase, but no 180-degree entanglement.
Note: Phase unwrapping is accomplished by comparing the phases of two adjacent data
points. If the phase difference between the two points is greater than 180 degrees, or
the DC offset phase of the first data point is greater than 180 degrees, then the phase
measurement may not be accurate.
Group delay format:
• Displays the transmission (propagation) time of signal in the device
• Y: Time (s)
• Typical measurement: Group delay
Linear amplitude scheme:
• Only positive values are displayed
• Y: No Unit (U, suitable for proportional measurements)
Watts (W, suitable for disproportionate measurements)
• Typical measurements: Reflection and transmission coefficients (amplitude), time domain
transformation
SWR format:
• Displays the reflection measurements calculated from the formula (1+ R)/(1-R), where R
is the reflection coefficient
• Valid for reflection measurements only
• Y: No units
• Typical measurements: SWR
Real number format:
• Show only the real part of the measured complex data
• Can display both positive and negative values
• Y: No units
• Typical measurements: Time domain, auxiliary input voltage signals for maintenance
purposes
Imaginary number format:
• Only imaginary parts of the measured data are displayed
• Y: No units
• Typical measurement: Network impedance matching
2.6.3 Polar coordinates
The polar coordinate format is used to view the amplitude and phase of the reflection
coefficients in S11 or S22 measurements.
You can use a cursor to display the following items:
• Linear or log amplitude (in dB)
• Phase (in degrees)
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