3 Short-Range Comms & IoT Mode
3.7 ACP Measurement
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 961
Span > 114.1 MHz, or
RBW > 800 kHz
"Fast Tuning" on
page 962
RBW > 290 kHz, or
Span > 4.2 MHz
"Best Wide-
offset" on page
961
Other conditions "Balanced" on
page 961
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 962
Center frequency is < 195 kHz, or
CF >= 1 MHz and Span <= 1.3 MHz
and RBW <= 75 kHz
"Best Close-in"
on page 961
All other conditions "Best Wide-
offset" on page
961
EP2
Models with option EP2 use a different
loop bandwidth for the fast-tuning
choice, which is a compromise
between tuning speed and phase
noise, giving good tuning speed at all
offsets. Although not as good as for
"Best Close-in" on page 961; this is
useful when you have to look across a
wide range of spans
(available, for example, in MXA for
excellent phase noise)
CF < 130 kHz , or
CF > 12 MHz and Span < 495 kHz and
RBW < 40 kHz
"Best Close-in"
on page 961
Span > 22 MHz, or
RBW > 400 kHz, or
CF ≤ 12 MHz and Span < 495 kHz and
RBW < 23 kHz
"Fast Tuning" on
page 962
All other conditions "Best Wide-
offset" on page
961
EP4
(available in CXA for improved phase
noise)
Span > 101 MHz or
RBW > 1.15 MHz or
Source Mode is set to “Tracking”
"Fast Tuning" on
page 962
CF is < 109 kHz or
CF >= 4.95 MHz and Span <= 666kHz
and RBW < 28 kHz
"Best Close-in"
on page 961
Short Range Comms & IoT Mode User's &Programmer's Reference 963
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