Data Analysis Features 141
o Target (NA Mode ONLY) Enter the Target value. The marker moves to the
first occurrence of the Target value to the right of its current position. The
FieldFox interpolates between measured data points to find the exact Target
value to two decimal points. The interpolated X-axis value is displayed in the
marker readout or marker table. Subsequent presses of the Target softkey
cause the marker to move to the right to find the next occurrence of the
Target value. When the marker reaches the end of the stimulus range, it
"wraps around" and continues the search from the beginning of the stimulus
range.
o Bandwidth ON OFF (NA Mode ONLY) Use to quickly toggle BW Markers ON
and OFF. When OFF, the marker table appears showing the X and Y-axis
positions of all enabled markers.
o Bandwidth (NA Mode ONLY) Specify the level in dB from the peak or valley
where bandwidth is measured.
o Negative numbers search for a Peak bandpass, such as a filter S21
response.
o Either of the following TWO methods can be used to search for a Valley or
Notch filter, such as the S11 response of a bandpass filter.
o Negative values search down from the TOP (MAX) of the response.
o Positive values search up from the BOTTOM (MIN) of the notch.
o If you first enter Negative, then Positive values, it may be necessary to
press Marker, then More, then Markers All Off.
S21 of a filter with BW Markers and associated readout values.
The search criteria is -3 dB.
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