This subsystem converts measured data from one representation to another and controls the transformation into the time domain (with option ZVAB-K2, Time Domain).
Command tree: CALCulate<Chn>:TRANsform
:TIME
:VNETworks (virtual network commands)
Converts S-parameters into matched-circuit (converted) Y-parameters or Z-parameters and vice versa, assuming that port no. i is terminated with Z0i so that the three parameter sets are equivalent and the following formulas apply:
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<Chn> |
Channel number used to identify the active trace. If unspecified the numeric suffix is set to 1.
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S | Y | P |
S-parameters, Y-parameters, Z-parameters |
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*RST value |
– (The initial representation of the trace is determined by means of CALCulate<Ch>:PARameter:SDEFine)
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SCPI, Command Types |
Device-specific, command or query.
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Example: |
*RST; CALC:PAR:MEAS 'Trc1'", '"Y-S22' Select the converted admittance Y<–S22 as measurement parameter of the default trace. CALC:TRAN:COMP S Convert the converted Y-parameter into an S-parameter.
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Defines the center time of the diagram in time domain.
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<Chn> |
Channel number used to identify the active trace
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<numeric_value> |
Center time of the diagram in time domain |
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Range [def. unit] |
-99.99999999999 s to +99.99999999999 s. The increment (parameters UP or DOWN) is 0.1 ns. [s] |
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*RST value |
1.5E-009 s
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SCPI, Command Types |
Confirmed, command or query
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Example: |
Reset the instrument, activating a frequency sweep, and enable the time domain transformation for the default trace.
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Note: If the x-axis is scaled in distance units (CALCulate<Chn>:TRANsform:TIME:XAXis DISTance), then the center value is entered in m; the range and default value changes accordingly.
Sets the sideband suppression for the Dolph-Chebyshev window. The command is only available if a Dolph-Chebyshev window is active (CALCulate<Chn>:TRANsform:TIME:WINDow DCHebyshev).
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<Chn> |
Channel number used to identify the active trace
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<numeric_value> |
Sideband suppression |
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Range [def. unit] |
10 dB to 120 dB. The increment (parameters UP or DOWN) is 10 dB. [dB] |
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*RST value |
32 dB
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SCPI, Command Types |
Device-specific, command or query
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Example: |
Reset the instrument and select a Dolph-Chebyshev window for filtering the data in the frequency domain.
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Calculates the harmonic grid for low pass time domain transforms according to one of the three alternative algorithms.
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<Chn> |
Channel number used to identify the active trace
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Parameters |
KFSTop –
Keep stop frequency and number of points |
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*RST value |
–
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SCPI, Command Types |
Device-specific, no query (the command causes an event)
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Example: |
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Defines the DC value for low pass transforms. The command is enabled only if the sweep points are on a harmonic grid (to be set explicitly or using CALCulate<Chn>:TRANsform:TIME:LPASs).
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<Chn> |
Channel number used to identify the active trace
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<numeric_value> |
DC value of the measured quantity |
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Range [def. unit] |
Depending on the measured quantity (–1 to +1 for S-parameters) |
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*RST value |
0
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SCPI, Command Types |
Device-specific, command or query
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Example: |
Select a low pass step transformation.
Calculate a harmonic grid, keeping the stop frequency and the number of points.
Set the DC value.
Extrapolate the measured trace, overwrite the defined DC value, and query the new value.
Switch over to continuous extrapolation (e.g. because you noticed a discrepancy between the manually entered DC value and the extrapolation and assume the extrapolation to be more trustworthy).
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Determines whether continuous extrapolation for the DC value is enabled.
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<Chn> |
Channel number used to identify the active trace
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<Boolean> |
ON –
Continuous extrapolation enabled |
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*RST value |
OFF [–]
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SCPI, Command Types |
Device-specific, command or query
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Example: |
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Extrapolates the measured trace towards f = 0 and overwrites the current DC value (CALCulate<Chn>:TRANsform:TIME:LPASs:DCSParam). The command is relevant for low pass time domain transforms.
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<Chn> |
Channel number used to identify the active trace
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Parameters |
None |
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*RST value |
–
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SCPI, Command Types |
Device-specific, no query (the command causes an event)
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Example: |
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Calculates the harmonic grid for low pass time domain transforms, keeping the stop frequency and the number of points.
Use CALCulate<Chn>:TRANsform:TIME:LPASs
if you wish to use one of the other algorithms for calculating the grid.
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<Chn> |
Channel number used to identify the active trace
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Parameters |
None |
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*RST value |
–
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SCPI, Command Types |
Device-specific, no query (the command causes an event)
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Example: |
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Defines the time span of the diagram in time domain.
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<Chn> |
Channel number used to identify the active trace
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<numeric_value> |
Time span of the diagram in time domain. |
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Range [def. unit] |
2E-012 s to 200 s. The increment (parameters UP or DOWN) is 0.1 ns. [s] |
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*RST value |
5E-009 s
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SCPI, Command Types |
Confirmed, command or query
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Example: |
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Note: If the x-axis is scaled in distance units (CALCulate<Chn>:TRANsform:TIME:XAXis DISTance), then the span is entered in m; the range and default value changes accordingly.
Defines the start time of the diagram in time domain.
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<Chn> |
Channel number used to identify the active trace
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<numeric_value> |
Start time of the diagram. |
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Range [def. unit] |
–100 s to +99.999999999998 s. The increment (parameters UP or DOWN) is 0.1 ns. [s] |
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*RST value |
–1E-009 s
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SCPI, Command Types |
Confirmed, command or query
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Example: |
Reset the instrument, activating a frequency sweep, and enable the time domain transformation for the default trace.
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Note: If the start
frequency entered is greater than the current stop frequency (CALCulate<Chn>:TRANsform:TIME:STOP),
the stop frequency is set to the start frequency plus the minimum frequency
span (CALCulate<Chn>:TRANsform:TIME:SPAN).
If the x-axis is scaled in distance units (CALCulate<Chn>:TRANsform:TIME:XAXis
DISTance),
then the start value is entered in m; the range and default value changes
accordingly.
Determines whether the time domain transformation for trace no. <Chn> is enabled.
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<Chn> |
Channel number used to identify the active trace
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<Boolean> |
ON –
Time domain representation active |
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*RST value |
OFF [–]
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SCPI, Command Types |
Confirmed, command or query
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Example: |
*RST; CALC:TRAN:TIME:STAT? Reset the instrument, activating a frequency sweep, and query whether the default trace is displayed in the time domain. The response is 0.
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Selects the type of stimulus to be simulated in the low pass transformation process.
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<Chn> |
Channel number used to identify the active trace
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Parameters |
IMPulse –
Impulse response, in bandpass or lowpass mode |
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*RST value |
IMP
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SCPI, Command Types |
Confirmed, command or query
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Example: |
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Defines the stop time of the diagram in time domain.
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<Chn> |
Channel number used to identify the active trace
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<numeric_value> |
Stop time of the diagram. |
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Range [def. unit] |
–99.999999999998 s to +100 s. The increment (parameters UP or DOWN) is 0.1 ns. [s] |
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*RST value |
+4E-009 s
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SCPI, Command Types |
Confirmed, command or query
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Example: |
See CALCulate<Chn>:TRANsform:TIME:STARt.
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Note: If the stop
frequency entered is smaller than the current start frequency (CALCulate<Chn>:TRANsform:TIME:STARt),
the start frequency is set to the stop frequency minus the minimum frequency
span (CALCulate<Chn>:TRANsform:TIME:SPAN).
If the x-axis is scaled in distance units (CALCulate<Chn>:TRANsform:TIME:XAXis
DISTance),
then the stop value is entered in m; the range and default value changes
accordingly.
Selects the time domain transformation type.
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<Chn> |
Channel number used to identify the active trace
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Parameters |
BPASs –
Band pass impulse (only impulse response; a step response CALCulate<Chn>:TRANsform:TIME:STIMulus
STEP
is automatically changed to impulse response) |
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*RST value |
BPASs
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SCPI, Command Types |
Confirmed, command or query
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Example: |
Select a low pass step transformation.
Calculate a harmonic grid, keeping the stop frequency and the number of points.
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Selects the window type for filtering the data in the frequency domain prior to the time domain transformation.
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<Chn> |
Channel number used to identify the active trace
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Parameters |
RECT –
No profiling (rectangle) |
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*RST value |
HANN
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SCPI, Command Types |
Confirmed (with some device-specific parameters), command or query
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Example: |
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Switches over between the x-axis scaling in time units or distance units.
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<Chn> |
Channel number used to identify the active trace
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TIME |
x-axis scaled in time units |
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DISTance |
x-axis scaled in distance units (Distance = Time * c0 * Velocity Factor) |
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*RST value |
OFF [–]
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SCPI, Command Types |
Device-specific, command or query
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Example: |
Reset the instrument, activating a frequency sweep, and enable the time domain transformation for the default trace.
Convert the x-axis scaling to distance units.
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