
5-12
ET User’s Guide
Optimizing Measurements
Reducing Trace Noise
Reducing Trace Noise
To help reduce the effect of noise on the data trace, you can use three
analyzer functions to activate measurement averaging, reduce system
bandwidth, and eliminate spurious responses.
To Activate Averaging for Reducing Trace
Noise
The analyzer uses a weighted running average for averaging. The noise
is reduced with each new sweep as the effective averaging factor
increments.
1. Press
.
2. Enter a value followed by
.
3. Press
.
Averaging is explained more fully in the previous section.
To Change System Bandwidth for Reducing
Trace Noise
By reducing the system bandwidth, you reduce the noise that is
measured during the sweep. However, the decreased bandwidth may
slow down the sweep. While averaging requires multiple sweeps to
reduce noise, narrowing the system bandwidth reduces the noise on each
sweep. See the previous section for a more detailed explanation of system
bandwidth.
Press
or
.
Narrower system bandwidths cause longer sweep times. When in auto
sweep time mode, the analyzer uses the fastest sweep time possible for
any selected system bandwidth. Auto sweep time mode is the default
analyzer setting.
AVG
Average Factor
ENTER
Average on OFF
AVG
System Bandwidth Narrow 250 Hz
Fine 15 Hz
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 ...