3 Short-Range Comms & IoT Mode
3.2 Modulation Analysis Measurement
Auto
Selects the LO (local oscillator) phase noise behavior to optimize dynamic range and
speed for various instrument operating conditions. See "Phase Noise Optimization
Auto Rules" on page 293 for details on the Auto rules.
The X-Series has two grades of LO; a high performance LO that gives the best phase
noise performance; and a medium-performance LO that gives excellent
performance.
In models with the high performance LO, Auto will choose:
Best Close in Phase Noise Best Wide-offset Phase Noise
Span ≤ 400 kHz >400 kHz
In models with the medium-performance LO, Auto will choose:
Best Close in Phase Noise Best Wide-offset Phase Noise
Span ≤ 150 kHz >150 kHz
Note that Fast Tuning will not be selected when in Auto.
Best Close-in Φ Noise
Example
:SPEC: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 in square
brackets, as this can vary depending on the hardware set in use. For example, in
some analyzers this annotation appears as [offset <20 kHz]
In instruments with Option EP0, the LO is configured for the best possible phase
noise at offsets up to 600 kHz from the carrier, regardless of spurious products that
occur with some center frequencies.
Best Wide-offset Φ Noise
Example
:SPEC:FREQ:SYNT 2
The LO phase noise is optimized for wider offsets from the carrier. Optimization is
especially improved for offsets from 70kHz to 300 kHz. Closer offsets are
compromised and the throughput of measurements (especially remote
measurements where the center frequency is changing rapidly), is reduced.
Short Range Comms & IoT Mode User's &Programmer's Reference 291
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