Keysight x-series Programmer's Reference

3 VMA Mode
3.9 SEM Measurement
Offset Freq Define
Enables you to select offset frequency definition. Each standard defines each offset
frequency from Carrier.
For example, 3GPP2 requires the “Carrier Center to Meas BW Edge” definition. LTE
conformance test requires “Carrier Edge to Meas BW Center” and/or “Carrier Edge
to Meas BW Edge” definition. The MSR standard requires “RF BW Edge to Meas BW
Center” and/or “RF BW Edge to Meas Edge” definition.
“Meas BW Edge” means the edge frequency of resolution bandwidth closer to the
carrier that is represented by Meas BW and Res BW settings. Actual center
frequency of Meas BW and the limit line have ½ Meas BW offset when the Meas BW
Edge is selected.
Note that the outermost (lowermost, uppermost) carrier at each side is determined
by which carrier edge frequency is located outermost within the RF BW or each sub-
block bandwidth, instead of which carrier center frequency is located outermost.
See also "Diagrams for Offset Freq Define" on page 1485.
Modes other than MSR, LTE-A, 5G NR
Options:
CTOCenter
From carrier center to the center ofoffsetmeasuring filter*
CTOEdge
From carrier center to the nominal –3 dB point of the offsetmeasuring filter*
closer to the carrier
ETOCenter
From Center Frequency – Span of Ref Channel/ 2 (for lower offset), Center
Frequency + Span of Ref Channel / 2 (for upper offset) of the carrier closest to
each offset to the centerofoffset measuring filter *
ETOEdge
From Center Frequency – Span of Ref Channel/ 2 (for lower offset), Center
Frequency + Span of Ref Channel / 2 (for upper offset) of the carrier closest to
each offset to the nominal –3 dB point of the offsetmeasuring filter * closer to the
carrier
*Measuring filter = Meas BW (N) x Res BW
** RF BW = BW
channel,CA
which is defined in each 3GPP standard, regardless of
“Measure Carrier” for the uppermost and the lowermost carriers being Enabled or
Disabled. When Number of Component Carriers = 1, RF BW = BW
channel
= 2 x
F
offset,RAT
Remote
Command
[:SENSe]:SEMask:OFFSet[1]|2:TYPE CTOCenter | CTOEdge | ETOCenter | ETOEdge
[:SENSe]:SEMask:OFFSet[1]|2:TYPE?
Example
:SEM:OFFS:TYPE ETOC
1483 Vector Modulation Analyzer Mode User's &Programmer's Reference

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)