Keysight x-series User Manual

3 Spectrum Analyzer Mode
3.3 Channel Power Measurement
NORMal
The historical, and thus backwards compatible, setting range (−50 to 0dBm)
and default setting (−10dBm). The instrument has been designed so that, at
the default setting, any signal below the Reference Level is extremely unlikely
to create ADC overloads. At this mixer level the scale fidelity will be within
specifications, thus compression with be negligible
TOI
Allows a range of settings of the "Max Mixer Level" on page 1969, −50 to
−10dBm, that can be optimum for measurements limited by the instrument
third-order dynamic range. The default setting, −25dBm, is commonly
appropriate but RBW affects this. A good setting for Max Mixer Level would be
higher than the optimum mixer level by half of the attenuator step size
COMPression
Allows a range of settings of the Max Mixer Level, −10 to +10dBm or more,
that can be optimum for measurements limited by the tradeoffs between
instrument accuracy due to compression, and dynamic range due to the noise
floor. The default setting, −3dBm, is commonly appropriate, representing
mixer drive levels that cause 1 dB or less compression at most carrier
frequencies
Typical measurements that would be optimized by this setting are the
measurement of low sideband levels, including nulls, in angle-modulated
signals (FM and PM). Also pulsed-RF measurements, including finding nulls to
estimate pulse width, which are often best done with significant overdrive
(compression) of the front end
Setting Name
(readback)
Setting Name
(verbose)
Max Mixer
Level Preset
Value, dBm
Max Mixer
Level minimum
value, dBm
Max Mixer
Level
maximum
value, dBm
NORMal
Normal – balance
TOI, noise, and
compression
−10 −50 0
TOI
TOI-limited
dynamic range
−25 −50 −10
COMPression
Compression-
limited dynamic
range
−3 −10 +30
Remote Command
[:SENSe]:POWer[:RF]:MIXer:RULEs NORMal | TOI | COMPression
[:SENSe]:POWer[:RF]:MIXer:RULEs?
Example
:POW:MIX:RULE:COMP
Dependencies Only appears in the Swept SA and RTSA measurements
Preset
NORM
3.3.3.3 Range (Non-attenuator models)
Only available for Keysight’s modular signal analyzers and certain other Keysight
products, such as VXT and M941xE.
Spectrum Analyzer Mode User's &Programmer's Reference 585

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)