Filter
Top Products
Chapter 5 141
Analog Measurements - Screens and Control Fields
Normalize Notch Freq
Normalize
This area performs three display operations:
• Save B saves the currently-displayed trace for the A-B operation.
• A only provides a continuously-updated display (the “normal” mode
of operation).
• A-B
displays the difference between the trace saved using Save B
and the currently displayed trace. The comparison can yield either
losses or gains in amplitude.
Operating Considerations
The A-B function works correctly only if the center frequency and span
settings are the same for both signals.
The reference level (Ref Level) can be changed (on the Main controls
menu) to move the trace below the top line of the display if the A-B
function results in a gain.
The
Hold key can be used to “freeze” the display at any time. This allows
you to view a trace before performing the Save B or A-B functions.
Screens on which this field is displayed
SPEC ANL: auxiliary controls menu
Notch Freq
This field sets the center frequency for the variable frequency notch
filter. It is typically used for distortion and SINAD measurements at
frequencies below or above the standard 1 kHz notch filter.
Operating Considerations
When the Notch Coupl field on the INSTRUMENT CONFIGURE
screen is set to AFGen1, this filter and the AFGen1 Freq field match
their settings. A warning message is then displayed if you attempt to
set the AFGen1 Freq value outside the 300 Hz to 10 kHz range of this
filter. When the Notch Coupl field is set to None
, this filter and
AFGen1 Freq operate independently.
Screens on which this field is displayed
AF ANALYZER
Main Menu