Agilent Technologies 8719ES User Manual page 55

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
Marker Search
filter passband.
2. Press
MKR ZERO
3. Press
Marker Search
4. Press
WIDTHS ON
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
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
for a Specific Amplitude" on page
2. Press
Marker Search
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 changes in
the trace response value with subsequent sweeps.
and
SEARCH: MAX
if you want the bandwidth relative to the maximum.
to access the marker search menu.
to calculate the center stimulus value, bandwidth, and the Q of a
and enter the new value from the front panel
WIDTH VALUE
1-39.
to track the specified amplitude search with
TRACKING ON
to place the marker near the center of the
Making Measurements
Using Markers
"To Search
1- 41