4-10 ES User’s Guide
Using Instrument Functions
Using Markers
To Search for
Target Values
1. Press
.
2. Press to choose the target level and enter the target
value. (The default value is −3 dB.)
3. Press and notice the marker moves to the first
occurrence of the target value to the right. The target value is in
reference to 0 dB.
4. Press and notice the marker moves to the first
occurrence of the target value to the left.
5. Each time you press or , the marker
moves to the next occurrence of the target level. If no occurrence is
found, the message, "Target not found." appears momentarily on
the display.
To Search for
Bandwidth Values
NOTE The bandwidth search function is intended for transmission or power
measurements in log mag format only.
1. Press .
The bandwidth search feature analyzes a bandpass filter and
calculates the bandwidth, center frequency, and Q (see note below) for
the specified bandwidth level. (The default bandwidth search level is
−3 dB.) The bandwidth information is displayed in the upper-right
corner of the network analyzer screen. The bandwidth feature puts
marker 1 in delta marker mode. (Delta marker mode is explained
later in this chapter.)
NOTE Center frequency is defined as the halfway point between the left and
right bandwidth cutoff points.
Loss is the amplitude of the center frequency marker.
Q stands for "quality factor," and is defined as the ratio of a circuit's
resonant frequency to its bandwidth. Your analyzer calculates Q as the
center frequency divided by the bandwidth.
MARKER
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