1-41
Making Measurements
Using Markers
Searching for a Bandwidth
The analyzer can automatically calculate and display the bandwidth (BW:), center
frequency (CENT:), Q, and loss of the device under test at the center frequency. (Q stands
for “quality factor,” defined as the ratio of a circuit's resonant frequency to its bandwidth.)
These values are shown in the marker data readout.
1. Press and to place the marker near the center of the
filter passband.
2. Press if you want the bandwidth relative to the maximum.
3. Press to access the marker search menu.
4. Press to calculate the center stimulus value, bandwidth, and the Q of a
bandpass or band reject shape on the measurement trace.
5. If you want to change the amplitude value (default is −3 dB) that defines the passband
or reject band, press and enter the new value from the front panel
keypad.
Figure 1-31 Example of Searching for a Bandwidth Using Markers
Tracking the Amplitude that You Are Searching
1. Set up an amplitude search by following one of the previous procedures in "To Search
for a Specific Amplitude" on page 1-39.
2. Press to track the specified amplitude search with
every new trace and put the active marker on that point.
When tracking is not activated, the analyzer finds the specified amplitude on the
current sweep and the marker remains at same stimulus value, regardless of chang es in
the trace response value with subsequent sweeps.
Marker Search
SEARCH: MAX
MKR ZERO
Marker Search
WIDTHS ON
WIDTH VALUE
Marker Search
TRACKING ON