HP Cell Phone Accessories E6380-90019 用户手册
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.
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.
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.
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.
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
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