Instrument Mode - AEA VIA Bravo MRI Operating Manual

3.8.4 Instrument Mode

The VIA Bravo MRI Unit can be operated in one of two modes: as a VIA meter or as an
SWR meter. The VIA and SWR meters can operate in either CW or sweep mode. The VIA
meter can also operate with or without cable nulling. Enter this sub menu to select the mode
of operation.
3.8.4.1 VIA (Vector Impedance Analyzer)
The VIA may be used in sweep or CW mode. Further, you can remove cable effects
from your measurements using the <with cable> option. See paragraph 3.12 for cable nulling
instructions. To operate without cable nulling, choose one of the <no cable> options. The
width command may be used to switch between CW and Sweep mode, see paragraph 3.2 .
3.8.4.1.1 Sweep Mode (with or without cable)
This mode measures impedances and can plot one or two of the following quantities:
1. Total impedance (Z)
2. Impedance angle (A or Theta)
3. Resistance (R)
4. Reactance (X)
3.8.4.1.2 CW Mode (with or without cable)
In CW mode, all of those quantities (see above) are displayed numerically, along with the
frequency, SWR and return loss.
3.8.4.2 SWR (Standing Wave Ratio Meter)
This mode displays SWR or S11 readings. The SWR meter may be used in sweep or
CW mode.
3.8.4.2.1 Sweep Mode
In sweep mode you can plot one or two of the following quantities:
1 SWR (Voltage Standing wave Ratio)
2 Return loss (in dB)
3 Reflection coefficient (S11) magnitude (gamma)
4 Reflection coefficient (S11) angle (gamma)
3.8.4.2.2
In CW mode, all of the above quantities are displayed numerically.
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