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3 Short-Range Comms & IoT Mode

3.7 ACP Measurement

Best Close-in

Without option EP0

:FREQ:SYNT 1

The LO phase noise is optimized for smaller offsets from the carrier, at the expense

of phase noise farther out.

The actual frequency offset within which noise is optimized is shown with in square

brackets, as this can vary depending on the hardware set in use. For example, in

some instruments this annotation appears as [offset <20 kHz]

With option EP0

:FREQ:SYNT 4

In instruments with Option EP0, the LO is configured for the best possible close-in

phase noise (offsets up to 600 kHz from the carrier), regardless of spurious products

that occur with some center frequencies. Because this is generally less desirable for

close-in measurements than the "Balanced" on page 961 setting, parameter 1

selects "Balanced" on page 961 in EP0 instruments, in the interests of optimizing

code compatibility across the family. Parameter 4 selects "Best Close-in" on page

961, which is usually not as good a choice as "Balanced" on page 961.

Balanced

:FREQ:SYNT 1

In instruments with EP0, the LO is configured for the best possible phase noise at

offsets up to 600 kHz from the carrier whenever there are no significant spurs within

the span observed with an on-screen carrier. When there will be such a spur, the LO

is reconfigured in a way that allows the phase noise to increase by 7 dB mostly

within ±1 octave around 400 kHz offset. The spurs will always be below −70 dBc.

Best Spurs

:FREQ:SYNT 5

In instruments with EP0, the LO is configured for better phase noise than the "Best

Wide-offset" on page 961 case close to the carrier, but the configuration has 11 dB

worse phase noise than the "Best Close-in" on page 961 case mostly within ±1

octave around 300 kHz offset. Spurs are even lower than in the "Balanced" on page

961 case at better than −90 dBc, whether or not the carrier is on-screen.

This setting is never selected when Phase Noise Optimization is in Auto, you must

select it manually.

Best Wide-offset

:FREQ:SYNT 2

Short Range Comms & IoT Mode User's &Programmer's Reference 961

Keysight x-series Instruction Manual

Other manuals for Keysight x-series