Keysight N9927-90001 User’s Guide 465
Frequency Offset Using Power Sensor (FOPS) – Option 208
FOPS Settings
——Then Freq Display. This determines how the receiver
frequencies below the graticules are displayed. Choose from
the following:
——Start
Annotated as Start and Stop frequencies.
——Center
Annotated as Center and Span frequencies.
——Then choose from the following two methods to determine the
offset frequency (the frequency that the receiver is offset from
the source). This is typically the frequency of the LO that is
used with the frequency converter. The frequency offset may
be positive, negative, or zero.
——Freq Offset
Enter an Offset frequency. The receiver frequencies
are calculated.
——Offset Calculator
Enter the Receiver Start and Stop
frequencies. Then press Calculate Offset
.
——Press Rx Sweep
to select the receiver sweep direction.
——Fwd
Used for systems for which the output frequency is
Offs + Src. The output frequency of the DUT and the
receiver sweeps in the same direction as the source.
——Rev
Used for systems for which the output frequency is
Offs - Src. The output frequency of the DUT and the
receiver sweeps in reverse direction as compared to the
source.
Invalid Settings
Violations of the following conditions will return an error message:
— The frequency span for the source and receiver must be the same.
— Both the source and receiver frequencies must be positive.
FOPS Configuration Examples
Negative Offset, RxSwp = Fwd (Offs + Src)
Src = 2 GHz to 3 GHz
Offset = -1 GHz
Rx = 1 GHz to 2 GHz
Positive Offset, RxSwp = Rev
(Offs - Src)
Src = 2 GHz to 3 GHz
Offset = 3.8 GHz
Rx = 1.800 GHz to 800 MHz
Positive Offset, RxSwp = Fwd
(Offs + Src)
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