64 Chapter 2
Instrument Functions: A - L
Auto Couple
Instrument Functions: A - L
2.2.3.1 Auto
Selects the LO phase noise behavior to optimize speed or dynamic range for various
instrument operating conditions.
For PSA, the
Auto rules choose:
• Fast Tuning, for span ≥ 10.5 MHz or the Res BW > 200 kHz
• Optimize £(f) for f >50 kHz, for spans >141.4 kHz, and for Res BWs >9.1 kHz
• Optimize £(f) for f <50 kHz, for all other spans and Res BWs.
Key Path:
Auto Couple, PhNoise Opt
Remote Command:
See “PhNoise Opt” on page 63.
Example: FREQ:SYNT:AUTO ON
2.2.3.2 Optimize £(f) for frequencies < 50 kHz
The LO phase noise is optimized for measuring signals with offsets less than 50 kHz from
the carrier, at the expense of phase noise beyond 50 kHz offset.
Key Path:
Auto Couple, PhNoise Opt
Remote Command:
See “PhNoise Opt” on page 63.
Example: FREQ:SYNT 1
2.2.3.3 Optimize £(f) for frequencies > 50 kHz
Optimizes phase noise for measuring offsets more than 50 kHz from the carrier, especially
those from 70 kHz to 300 kHz. Closer offsets are compromised and the throughput of
measurements (especially remote measurements where the center frequency is changing
rapidly), is reduced. There is a graph of typical phase noise performance in the
Specifications Guide.
Key Path:
Auto Couple, PhNoise Opt
Remote Command:
See “PhNoise Opt” on page 63.
Example: FREQ:SYNT 2
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