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3 Short-Range Comms & IoT Mode

3.11 IQ Waveform Measurement

interface. Also, if the preamp is turned on, the Low Noise Path is not used, whether

or not the Full Bypass Enable is selected in the user interface. The only time the Low

Noise Path is used is when Full Bypass Enable is selected, the sweep is completely

in High Band (> 3.6GHz) and no preamp is in use.

CAUTION

When Full Bypass Enable is selected, and "Y Scale" on page 1633 is set to

0dB, there will be a direct AC connection between the input and the first

converter when the Low Noise Path switches in (when Start Freq >3.6GHz and

the Preamp is either not licensed, set to Low Band, or Off). This puts the first

converter at considerable risk to be damaged by high AC power. Consequently,

whenever Full Bypass Enable is selected, a warning message appears in the

status bar:

“Full Bypass Enabled, maximum safe input power reduced”

Microwave Preselector Bypass Backwards Compatibility

Example Bypass the microwave preselector:

:POW:MW:PRES OFF

Notes Included for Microwave Preselector Bypass backwards compatibility

The ON parameter sets the STD path (:POW:MW:PATH STD)

The OFF parameter sets path MPB (:POW:MW:PATH MPB)

Preset

Backwards

Compatibility

SCPI

[:SENSe]:POWer[:RF]:MW:PRESelector[:STATe] ON | OFF | 0 | 1

[:SENSe]:POWer[:RF]:MW:PRESelector[:STATe]?

Frequency Extender Preselection Bypass

Only applies to the high frequency path of the Frequency Extender, and only if the

Frequency Extender allows it. For example, the V3050A high frequency path is 50 –

110GHz and does allow control of the preselector bypass.

When the Frequency Extender’s preselection is bypassed, flatness is improved, but

will be subject to spurs from out-of-band interfering signals. For bandwidths greater

than 2.5[GHz], it is recommended that the signal bypass the Frequency Extender

Preselector since the max bandwidth of the Preselector can be as narrow as 2.5

[GHz].

For most applications, the preset state is OFF, which gives the best remote-control

throughput, minimizes acoustic noise from switching, minimizes out of band spurs,

and minimizes the risk of wear in the hardware switches.

Short Range Comms & IoT Mode User's &Programmer's Reference 1555

Keysight x-series Instruction Manual

Other manuals for Keysight x-series