Keysight x-series Instruction Manual

3 Short-Range Comms & IoT Mode
3.5 Channel Power Measurement
:CHP:FREQ:SPAN?
Dependencies If the electrical attenuator is enabled, any attempt to set Span such that the Stop Frequency would be
>3.6 GHz results in an error
In instruments with an RF Preselector, such as MXE, you cannot sweep across the band break at 3.6
GHz while the RF Preselector is on in Continuous sweep, as there is a mechanical switch which
bypasses the RF Preselector above 3.6GHz. See the Stop Frequency control description for details of
this limitation
For MSR Mode, this control is not shown
For WLAN 802.11ac (80 MHz + 80 MHz), the control is not enabled, and its value is coupled with the
spacing between the center frequencies of the two carriers
Span = | Center Frequency 1 – Center Frequency 2| + Integ BW + 40 MHz Margin
When the calculated span is over 1 GHz, it is still coupled to its maximum value, which is 1 GHz
Couplings Span affects "Res BW" on page 596, Sweep Time, FFT & Sweep choice (including FFT Width, Phase
Noise Optimization and ADC Dither auto couplings)
Any value of Center Frequency or Span that is within the frequency range of the instrument is allowed
when the value is being set through the front panel numeric keypad or the SCPI command. The other
parameter is forced to a different value if needed, to keep the Start and the Stop Frequencies within
the instrument’s frequency range
When using the knob or the step up/down keys or the UP |DOWN keywords in SCPI, the value that is
being changed, that is, Center Frequency or Span, is limited so that the other parameter is not forced
to a new value
When Res BW is set to Auto, the resolution bandwidth is auto-coupled to span. The ratio of span
/RBW is approximately 106:1. When Res BW is set to Man, bandwidths are entered by the user, and
these bandwidths are used regardless of other instrument settings
Since Span is coupled to Integ BW in the factory default condition, if you change the Integ BW setting,
the span setting changes by a proportional amount until a limit value is reached. However, the span
can be individually set. The minimum value of the span is coupled with the integration bandwidth
Span cannot be set less than the Integ BW value. When Span is changed, the ratio of Span/Integ BW
is set, and retained when Integ BW is changed
Preset Depends on instrument maximum frequency, mode, measurement, and selected input
See "Span Presets" on page 616
State Saved Saved in instrument state
Min 100Hz
In 5GNR, LTEAFDD, and LTEATDD Modes, this value is the minimum value required for the
measurement, which depends on the Component Carrier configuration
Max Depends on instrument maximum frequency, mode, measurement, and selected input. See "Span
Presets" on page 616
If the knob or step keys are being used, depends on the value of the other three interdependent
parameters Center Frequency, Start Frequency, Stop Frequency
Annunciation Data out of range, value clipped to upper limit
Annotation Span <value> appears on the first line of the annotation in the lower right corner of display
LTE, 5G NR Modes only:
Short Range Comms & IoT Mode User's &Programmer's Reference 615

Keysight x-series Specifications

General

Analysis Bandwidth	Up to 1 GHz (depending on model)
Real-Time Bandwidth	Up to 1 GHz (depending on model)
Form Factor	Benchtop
Connectivity	LAN, USB, GPIB
Resolution Bandwidth	1 Hz to 10 MHz (depending on model)