
4-12
ET User’s Guide
Using Instrument Functions
Using Markers
To Search for
Notch Values
NOTE
The notch search function is intended for transmission or power
measurements in log mag format only.
1. To follow along with this example, you will need to connect a notch
filter to the analyzer in place of the bandpass filter shown in
2. Press
.
3. The notch search feature analyzes a notch filter and calculates the
bandwidth, center frequency, and Q (see note below) for the specified
notch level. (The default notch search level is
−
6 dB.) The resulting
information is displayed in the upper-right corner of the network
analyzer screen. The notch feature puts marker 1 in delta marker
mode. (Delta marker mode is explained later in this chapter.)
NOTE
Q stands for "quality factor," 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.
Each marker's dedicated use is listed in the following table.
shows a
−
6 dB notch marker search on measurement channel 1.
Dedicated Use of Markers in Notch Search Mode
a. The center frequency is defined by the analyzer as the midpoint between the left
and right notch points.
b. Where n is the target value, and the
−
n dB point is relative to the maximum
response (marker 1).
MARKER
All Off Marker Search Notch
Dedicated Use
Measurement Channel 1
Measurement Channel 2
maximum power value
marker 1
marker 2
center frequency of stop band
a
marker 3
marker 4
notch
−
n dB point
b
(left)
marker 5
marker 7
notch
−
marker 6
marker 8
Summary of Contents for HP 8712ET
Page 8: ...viii ET User s Guide ...
Page 17: ...ET User s Guide 1 1 1 Installing the Analyzer ...
Page 34: ...1 18 ET User s Guide Installing the Analyzer Preventive Maintenance ...
Page 35: ...ET User s Guide 2 1 2 Getting Started ...
Page 52: ...2 18 ET User s Guide Getting Started Performing the Operator s Check ...
Page 53: ...ET User s Guide 3 1 3 Making Measurements ...
Page 118: ...3 66 ET User s Guide Making Measurements Measuring Impedance Magnitude ...
Page 119: ...ET User s Guide 4 1 4 Using Instrument Functions ...
Page 143: ...ET User s Guide 4 25 Using Instrument Functions Using Markers Figure 4 15 Delta Marker Mode ...
Page 149: ...ET User s Guide 4 31 Using Instrument Functions Using Limit Testing Figure 4 16 Limit Lines ...
Page 207: ...ET User s Guide 5 1 5 Optimizing Measurements ...
Page 226: ...5 20 ET User s Guide Optimizing Measurements Measuring Devices with Long Electrical Delay ...
Page 227: ...ET User s Guide 6 1 6 Calibrating for Increased Measurement Accuracy ...
Page 266: ...6 40 ET User s Guide Calibrating for Increased Measurement Accuracy Checking the Calibration ...
Page 267: ...ET User s Guide 7 1 7 Front Rear Panel ...
Page 292: ...7 26 ET User s Guide Front Rear Panel Line Module ...
Page 293: ...ET User s Guide 8 1 8 Hardkey Softkey Reference ...
Page 395: ...ET User s Guide 9 1 9 Specifications ...
Page 397: ...ET User s Guide 9 3 Specifications System Performance ...
Page 443: ...ET User s Guide 10 1 10 Safety and Regulatory Information ...
Page 449: ...ET User s Guide 10 7 Safety and Regulatory Information Regulatory Information ...
Page 450: ...10 8 ET User s Guide Safety and Regulatory Information Regulatory Information ...
Page 451: ...ET User s Guide 11 1 11 Factory Preset State and Memory Allocation ...