38 Chapter 2
Quick Start: Learning How to Make Measurements
Learning to Make Transmission Measurements
Measuring Other Aspects of Insertion Loss with Marker
Functions
Using the analyzer marker functions, you can derive several important filter parameters
from the measurement trace that is shown on the analyzer display.
Figure 2-5 Example Measurement of 3 dB Bandwidth
Measuring 3 dB Bandwidth.
The analyzer can calculate your test device bandwidth between two equal power levels. In
this example procedure, the analyzer calculates the −3 dB bandwidth relative to the center
frequency of the filter.
1. Press
Marker and turn the front panel knob to move the marker to the center frequency
position of the filter passband.
You can also position the marker by entering a frequency location: for example, press
125, M/µ.
2. Press
MKR ZERO to zero the delta marker magnitude and frequency (this sets the delta
marker reference). The −3 dB points will be relative to this marker.
The softkey label changes to MKR ZERO ∆ REF= ∆ to show you that the delta reference point
is the small ∆ symbol.
3. Press Marker Fctn, MKR SEARCH to enter the marker search mode.
4. Press
WIDTHS ON.
The analyzer calculates the −3 dB bandwidth, the center frequency and the Q (Quality
Factor) of the test device and lists the results in the upper-right corner of the display.
Markers 3 and 4 indicate the location of the −3 dB points, as shown in Figure 2-5.
To Next Page
Loading...
