3 Short-Range Comms & IoT Mode
3.5 Channel Power Measurement
affected when moving the LO more than 2.5 MHz and up to 10 MHz from the stop
frequency to the next start frequency.
In instruments with Option EP0, this is the same configuration as "Best Spurs" on
page 642. It is available with the "Fast Tuning" on page 642 label for convenience,
and to make the user interface more consistent with other X-Series instrument
family members.
(In models whose hardware does not provide for a "Fast Tuning" on page 642
option, the settings for "Best Close-in" on page 641 are used if "Fast Tuning" on
page 642 is selected. This gives the fastest possible tuning for that hardware set.)
Auto
:FREQ:SYNT:AUTO ON
Selects the LO (local oscillator) phase noise behavior to optimize dynamic range and
speed for various instrument operating conditions. The selection rules are as
follows.
Auto Optimization Rules
X-Series instruments have several grades of LO, offering different configurations
when in the Auto Mode. The rules for Auto selection are as follows:
Models with Option Conditions Selection
EP0
Models with option EP0 have a two
stage local oscillator, which switches
to a single loop for fast tuning
(available in UXA)
Center frequency is < 699.9 kHz "Balanced" on
page 641
Span > 114.1 MHz, or
RBW > 800 kHz
"Fast Tuning" on
page 642
RBW > 290 kHz, or
Span > 4.2 MHz
"Best Wide-
offset" on page
642
Other conditions "Balanced" on
page 641
EP1
Models with option EP1 have a two-
loop local oscillator, which switches to
a single loop for fast tuning
(available in PXA)
Span > 44.44 MHz, or
RBW > 1.9 MHz, or
Source Mode is set to “Tracking”
"Fast Tuning" on
page 642
Center frequency is < 195 kHz, or
CF >= 1 MHz and Span <= 1.3 MHz
and RBW <= 75 kHz
"Best Close-in"
on page 641
All other conditions "Best Wide-
offset" on page
642
Short Range Comms & IoT Mode User's &Programmer's Reference 643
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