Agilent Technologies E4445A User Manual
Chapter 2
77
Instrument Functions: A - L
Auto Couple
In
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ru
m
e
nt
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ions
:
A
-
-
L
2.1.3.2
Optimize £(f) for frequencies < 50 kHz
The LO phase noise is optimized for offsets less than 50 kHz from the carrier, at the
expense of phase noise beyond 50 kHz offset.
expense of phase noise beyond 50 kHz offset.
Key Path:
Auto Couple
,
PhNoise Opt
Remote Command:
See “PhNoise Opt” on
Example:
FREQ:SYNT 1
2.1.3.3
Optimize £(f) for frequencies > 50 kHz
Optimizes phase noise for offsets above 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.
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
Example:
FREQ:SYNT 2
2.1.3.4
Optimize LO for Fast Tuning
In this mode, the LO behavior compromises phase noise at all offsets from the carrier
below approximately 2 MHz. This allows rapid measurement throughput when changing
the center frequency or span.
below approximately 2 MHz. This allows rapid measurement throughput when changing
the center frequency or span.
Key Path:
Auto Couple
Remote Command:
See “PhNoise Opt” on
Example:
FREQ:SYNT 3
2.1.4
Detector
See
Detector
in Det/Demod menu.
Key Path:
Auto Couple