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

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Chapter 6

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Agilent Technologies 8935 series e6380a manual Notch Freq, Notch Gain, Offset Freq