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208 Chapter 6
C:\Spk\Ref\RefGuideRevE\Anlgscrn.fm
Analog Measurements - Screens and Control Fields
Control Fields for Analog Measurements
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
Notch Gain
This field displays and selects the gain of the AF analyzer’s notch filter
amplifier. This amplifier is only used for making SINAD and distortion
measurements. (See “Gain Cntl” on page 199 for more information.)
Screens on which this field is displayed
AF ANALYZER
Offset Freq
Frequency offset (RF generator) sets the difference between the
instantaneous frequencies of the tracking generator and the center
frequency of the spectrum analyzer.
This field is displayed only when Track is selected in the Track/Fixed
field on the RF Gen controls menu.
Operating Considerations
The offset can be a positive or negative value. When set to zero, the
tracking generator produces a sweeping signal that matches the
spectrum analyzer’s tune frequency.
Screens on which this field is displayed
SPEC ANL: RF generator controls menu