Μw Preselector Bypass; Internal Preamp - Agilent Technologies X Series Manual

µW Preselector Bypass
This key toggles the preselector bypass switch for band 1 and higher. When the microwave presel is on,
the signal path is preselected. When the microwave preselector is off, the signal path is not preselected.
The preselected path is the normal path for the analyzer.
The preselector is a tunable bandpass filter which prevents signals away from the frequency of interest
from combining in the mixer to generate in-band spurious signals (images). The consequences of using a
preselector filter are its limited bandwidth, the amplitude and phase ripple in its passband, and any
amplitude and phase instability due to center frequency drift.
Option MPB or pre-selector bypass provides an unpreselected input mixer path for certain X-Series
signal analyzers with frequency ranges above 3.6 GHz. This signal path allows a wider bandwidth and
less amplitude variability, which is an advantage when doing modulation analysis and broadband signal
analysis. The disadvantage is that, without the preselector, image signals will be displayed. Another
disadvantage of bypassing the preselector is increased LO emission levels at the front panel input port.
Key Path
Example
Dependencies
Readback Text
Initial S/W Revision
Example
Preset
Backwards Compatibility
SCPI
Backwards Compatibility
Notes

Internal Preamp

Accesses a menu of keys that control the internal preamps. Turning on the preamp gives a better noise
figure, but a poorer TOI to noise floor dynamic range. You can optimize this setting for your particular
measurement.
The instrument takes the preamp gain into account as it sweeps. If you sweep outside of the range of the
preamp the instrument will also account for that. The displayed result will always reflect the correct gain.
AMPTD Y Scale, µW Path Control
:POW:MW:PATH MPB
Key is blanked if current mode does not support it.
Key is grayed out if mode supports it but current measurement does not
support it.
Key is blank unless Option MPB is present and licensed. If SCPI command
sent when MPB not present, error –241, "Hardware missing; Option not
installed" is generated.
µW Preselector Bypass
A.04.00
:POW:MW:PRES OFF
Bypasses the microwave preselector
ON
[:SENSe]:POWer[:RF]:MW:PRESelector[:STATe] ON|OFF|0|1
[:SENSe]:POWer[:RF]:MW:PRESelector[:STATe]?
The ON parameter sets the STD path. The OFF parameter sets Path MPB.
AMPTD Y Scale
381