Measuring Other Aspects Of Insertion Loss With Marker Functions; Example Measurement Of 3 Db Bandwidth - HP 8753E Installation And Quick Start Manual

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 and turn the front panel knob to move the marker to the center frequency
Marker
position of the filter passband.
You can also position the marker by entering a frequency location: for example, press
, .
125 M/µ
2. Press to zero the delta marker magnitude and frequency (this sets the delta
MKR ZERO
marker reference). The −3 dB points will be relative to this marker.
The softkey label changes to
is the small ∆ symbol.
3. Press ,
Marker Fctn MKR SEARCH
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
38
MKR ZERO ∆ REF= ∆ to show you that the delta reference point
to enter the marker search mode.
Figure 2-5.
Chapter 2