Reducing Trace Noise; To Activate Averaging For Reducing Trace Noise; To Change System Bandwidth For Reducing Trace Noise - HP 8712ES User Manual

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 Average Factor
AVG
2. Enter a value followed by
3. Press Average on OFF
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 System Bandwidth Narrow 250 Hz
AVG
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.
5-12
.
ENTER .
.
or Fine 15 Hz .
ES User's Guide