Agilent Technologies E4445A User Manual
76
Chapter 2
Instrument Functions: A - L
Auto Couple
In
st
ru
m
e
nt
Funct
ions
:
A
-
L
Remote Command:
[:SENSe]:SWEep:FFT:SPAN:RATio <integer>
[:SENSe]:SWEep:FFT:SPAN:RATio?
Example:
SWE:FFT:SPAN:RAT 20
2.1.3
PhNoise Opt
Selects the LO (local oscillator) phase noise behavior for various operating conditions. The
selected value is displayed below the £(f) indicator on the left side of the screen. It is
preceded by # if
selected value is displayed below the £(f) indicator on the left side of the screen. It is
preceded by # if
PhNoise Opt Auto
has been selected.
Key Path:
Auto Couple
State Saved:
Saved in instrument state
Factory Preset: Auto
Remote Command:
[:SENSe]:FREQuency:SYNThesis 1|2|3
1, selects optimization of phase noise for frequencies offset <50 kHz from the carrier.
2, selects optimization of phase noise for frequencies offset >50 kHz from the carrier.
3, selects optimization of LO for fast tuning
2, selects optimization of phase noise for frequencies offset >50 kHz from the carrier.
3, selects optimization of LO for fast tuning
[:SENSe]:FREQuency:SYNThesis?
[:SENSe]:FREQuency:SYNThesis:AUTO OFF|ON|0|1
[:SENSe]:FREQuency:SYNThesis:AUTO?
Example:
FREQ:SYNT:AUTO OFF
FREQ:SYNT 3, selects optimization for fast tuning
2.1.3.1
Auto
Selects the LO phase noise behavior to optimize speed or dynamic range for various
instrument operating conditions.
instrument operating conditions.
For PSA: the
Auto
rules choose
Fast Tuning
whenever the span
≥10.5 MHz or the Res BW
>200 kHz. Otherwise, for spans >141.4 kHz, and for Res BWs >9.1 kHz, the
Auto
rules
choose
Optimize £(f) for f >50 kHz
. All remaining cases choose
Optimize £(f) for f <50 kHz
.
Key Path:
Auto Couple
,
PhNoise Opt
Remote Command:
See “PhNoise Opt” on
Example:
FREQ:SYNT:AUTO ON