THIS OPTION REQUIRES OPTION 302 (SOLD SEPARATELY)

This feature allows FieldFox’s source frequency to be set independently from the power sensor (receiver) frequency. With frequency-offset using a power sensor (FOPS), the frequency of both the source and receiver are swept, and the two track each other. The offset frequency can be negative, zero, or positive.

FOPS can be used to characterize the scalar transmission response of devices such as mixers and converters. This frequency-offset capability is necessary for conversion loss/gain measurements on frequency-translating devices since, by definition, the input and output frequencies of the DUT are different. The FieldFox source stimulates the DUT, and the power sensor is used as the measurement receiver.

Since power sensors are inherently broadband devices (not frequency-selective), the user should ensure that only the signal of interest is present at the power sensor input and that all other signals are filtered appropriately.

Setup parameters

• Source frequency - Center/span or start/stop
• Receiver frequency - Range determined by power sensor range
• Frequency offset - Positive offset or negative offset
• Frequency step size - 30 kHz minimum
• Number of points - 2 to 1601
• Combination of the number of points and frequency step size limited by span.
• Dwell time/point - 0 to 1.0 sec