This subsystem sets frequency-related parameters, especially the measurement and display ranges for the different sweep types, and controls the harmonic distortion measurement.
Command tree: [SENSe<Ch>:]FREQuency
Note: For a frequency sweep the range can be defined alternatively by a combination of Start/Stop frequencies or a Center frequency and Span. In fixed frequency mode (power sweep or Time/CW Mode; see [SENSe<Chn>:]FUNCtion[:ON]) the measurement frequency is set by means of [SENSe<Ch>:]FREQuency:CW|FIXed.
Defines the fixed (Continuous Wave, CW) frequency for all sweep types operating at fixed frequency (power sweep, time sweep, CW mode sweep). The two command forms FREQ:CW and FREQ:FIX are equivalent.
[SENSe<Ch>:]FREQuency:CW|FIXed
is equivalent to SOURce<Ch>:FREQuency<Pt>:CW|FIXed. Source and receiver frequency
are equal; the four commands overwrite each other.
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<Ch> |
Channel number.
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<CW_frequency> |
Fixed stimulus and analyzer frequency. |
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Range [def. unit] |
Depending on the instrument model [Hz]. The increment (parameters UP or DOWN) is 0.1 kHz. |
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*RST value |
1 GHz
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SCPI, Command Types |
Confirmed, command or query.
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Example: |
Activate a power sweep and select the wave quantity
a1
Set the CW frequency to 100 MHz.
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Enables or disables the Low Phase Noise function.
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<Ch> |
Channel number.
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<Boolean> |
ON | OFF - Low phase noise on or off. |
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*RST value |
OFF
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SCPI, Command Types |
Device-specific, command or query.
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Example: |
Enable the Low Phase Noise function.
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[SENSe<Ch>:]FREQuency:MODESelects the sweep type and defines which set of commands controls the stimulus frequency.
The command [SENSe<Ch>:]SWEep:TYPE
provides a complete list of sweep types.
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<Ch> |
Channel number.
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SWEep |
Linear or logarithmic frequency sweep, depending on the selected spacing ([SENSe<Ch>:]SWEep:SPACing LINear | LOGarithmic). The frequency range is set via [SENSe<Ch>:]FREQuency:STARt etc. |
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SEGMent |
Segmented frequency sweep. The sweep range is composed of several continuous frequency ranges or single frequency points defined by means of the commands in the [SENSe<Ch>:]SEGMent<Seg>... subsystem. |
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CW | FIXed |
Time sweep. The measurement is performed at constant frequency ([SENSe<Ch>:]FREQuency:CW|FIXed) and repeated over a specified period of time at constant time intervals. |
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*RST value |
SWEep
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SCPI, Command Types |
Confirmed (with device-specific *RST value and parameters), command or query.
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Example: |
FREQ:MODE CW Activate a time sweep.
Set the CW frequency to 100 MHz.
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Defines whether the analyzer measures with a local oscillator frequency LO below or above the RF input frequency.
In a segmented frequency sweep, it is possible to set
the sideband (SBANd) parameter individually for each segment; see [SENSe<Ch>:]SEGMent<Seg>:DEFine.
The [SENSe<Ch>:]FREQuency:SBANd
setting is global and not valid for segmented sweeps. The two sideband
settings do not overwrite each other.
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<Ch> |
Channel number.
|
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POSitive |
The LO frequency is always above the measured RF frequency. |
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NEGative |
The LO frequency is always below the measured RF frequency. |
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AUTO |
The analyzer auto-selects the local oscillator frequency, depending on the receiver (RF) frequency and the test port. |
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*RST value |
AUTO
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SCPI, Command Types |
Device-specific, command or query.
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Example: |
*RST; :SWE:TYPE?; :FREQ:SBAN? Query the *RST values for the sweep type and the sideband setting. The response is LIN (linear frequency sweep) and AUTO (automatic setting of the LO frequency).
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Defines the width of the measurement and display range for a frequency sweep.
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<Ch> |
Channel number.
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<span> |
Frequency span of the sweep. |
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Range [def. unit] |
Depending on the instrument model [Hz]. The increment (parameters UP or DOWN) is 0.1 kHz. |
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*RST value |
Maximum frequency range of the analyzer: fMAX - fMIN
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SCPI, Command Types |
Confirmed, command or query.
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Example: |
FUNC "XFR:POW:RAT B1, A2" Activate a frequency sweep and select the ratio B1/A2 as measured parameter for channel and trace no. 1.
Set center frequency to 100 MHz.
Set frequency span to 50 kHz, leaving the center frequency unchanged.
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Note: The measurement range defined by means of the span and the current center frequency ([SENSe<Ch>:]FREQuency:CENTer), must not exceed the allowed frequency range of the analyzer. If necessary, the center frequency is adjusted to fMIN + Span/2 or fMAX – Span/2.
Defines the start frequency for a frequency sweep which is equal to the left edge of a Cartesian diagram.
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<Ch> |
Channel number.
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<start_frequency> |
Start frequency of the sweep. |
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Range [def. unit] |
Depending on the instrument model [Hz]. The increment (parameters UP or DOWN) is 0.1 kHz. |
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*RST value |
Minimum frequency of the analyzer: MIN
|
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SCPI, Command Types |
Confirmed, command or query.
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Example: |
FUNC "XFR:POW:RAT B1, A2" Activate a frequency sweep and select the ratio B1/A2 as measured parameter for channel and trace no. 1.
Set start frequency to 100 kHz.
Set stop frequency to 10 MHz.
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Note: If the start frequency entered is greater than the current stop frequency ([SENSe<Ch>:]FREQuency:STOP), the stop frequency is set to the start frequency plus the minimum frequency span ([SENSe<Ch>:]FREQuency:SPAN).
Defines the stop frequency for a frequency sweep which is equal to the right edge of a Cartesian diagram.
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<Ch> |
Channel number.
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<stop_frequency> |
Stop frequency of the sweep. |
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Range [def. unit] |
Depending on the instrument model [Hz]. The increment (parameters UP or DOWN) is 0.1 kHz. |
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*RST value |
Maximum frequency of the analyzer: MAX
|
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SCPI, Command Types |
Confirmed, command or query.
|
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Example: |
FUNC "XFR:POW:RAT B1, A2" Activate a frequency sweep and select the ratio B1/A2 as measured parameter for channel and trace no. 1.
Set start frequency to 100 kHz.
Set stop frequency to 10 MHz.
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Note: If the stop frequency entered is smaller than the current start frequency ([SENSe<Ch>:]FREQuency:STARt), the start frequency is set to the stop frequency minus the minimum frequency span ([SENSe<Ch>:]FREQuency:SPAN).
