Keysight N9912A User Manual page 126

NOTE To make swept FOPS measurements at a single frequency, choose Swept, then enter
a Src Center frequency, then Span = 0 Hz.

Invalid Settings
Violations of the following conditions will return an error message:
 The frequency span for the source and receiver must be the same.

FOPS Configuration Examples
126
Used to make swept FOPS measurements.
Swept
Then enter source (Src) frequencies as either Center and Span or Start and
o
Stop. Both methods set the FieldFox internal source sweep range out the Port 1
RF Output connector.
The frequency limits are determined by the limits of both the FieldFox and the
power sensor.
The LOW frequency is limited by the higher of either the FieldFox or the power
o
sensor minimum frequencies.
The HIGH frequency is limited by the lower of either the FieldFox or the power
o
sensor maximum frequencies.
Then More.
o
Then Display. This determines how the receiver frequencies below the
Freq
o
graticules are displayed. Choose from the following:
Annotated as Start and Stop frequencies.
o
Start
Annotated as Center and Span frequencies.
o
Center
Then choose from the following two methods to determine the offset frequency
o
(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.
Enter an Offset frequency. The receiver frequencies are
Freq Offset
o
calculated.
Offset Calculator
o
Calculate Offset.
Press to select the receiver sweep direction.
Rx Swp
o
Used for systems for which the output frequency is Offs + Src. The
o Fwd
output frequency of the DUT and the receiver sweeps in the same direction as
the source.
Used for systems for which the output frequency is Offs - Src. The
o
Rev
output frequency of the DUT and the receiver sweeps in reverse direction as
compared to the source.
Both the source and receiver frequencies must be positive.
Negative Offset, RxSwp =
Src = 2 GHz to 3 GHz
Offset = -1 GHz
Rx = 1 GHz to 2 GHz
Enter the Receiver Start and Stop frequencies. Then press
(Offs + Src)
Fwd
FieldFox User's Guide