4
VNA Narrow Format
Shown above is the VNA mode presented in narrow chart format. In this mode, the chart is windowed
to 152 points visible. Note that the left and right scale indicators are still present, as well as the
cursor frequency, left and right scale cursor values displayed below the chart. As was the case in
wide chart format shown previously, moving the cursor past either edge of the chart will cause the
chart to scroll, revealing the data points that were previously not visible.
The sidebar now has fewer indicators, and the numerals for them are much larger-- enabling the user
to see them from a distance. The top indicator will always be the measurement for the left scale, at
center frequency. The trace color indicator (the triangle to the left of the indicator) gives the user a
visual cue as it will always be the same color as the trace that it belongs to.
The second indicator will always be the associated with the chart's right side scale, and the trace
color indicator will be the same color of that trace as well.
The third indicator will not always be present. This is the indicator for the value of 'Q' for the circuit
under test. In VNA mode, the 'Q' factor is displayed only when narrow chart format is selected
(shown here), and only if the impedance magnitude ('Z-MAG') is selected for either scale. The 'Q'
factor measurement will be explained in detail later in this document.
SWR/RL Wide Format
Shown above is screen of the MRI-3000 in SWR/RL mode, with wide chart format selected. This
appears similar to the screen in VNA mode, with some differences. In SWR/RL mode, only the left
scale is displayed, and only one trace is drawn on the chart. Only two measurements can be
selected to be plotted on the chart, SWR and RL (return loss). Pressing the SWR/RL key will cause
the displayed trace to switch between SWR and Return Loss.
The Sidebar to the left of the chart contains the following indicators, which will always be present for
this mode and chart format, and will
always
be the measurement at center frequency:
SWR:
This indicator displays the Standing Wave Ratio measurement of the current trace
at center
frequency
.
Return Loss
:
Labeled 'RTL' this indicator is the measured return loss of the unit under test.
Impedance Magnitude:
Labeled "MAG", this is the vector sum of the impedance's resistance and
reactance components. This value is in Ω, and is the same measurement as the one in VNA mode.
