
19-2
S-Parameter Commands
S-Parameter
Commands
This subsystem provides support for the S-parameter features, which are part of Option 202,
Enhanced Impedance and S-Parameter software. The S-parameter graph displays the S-
parameters that have been transformed from the TDR/TDT time domain data to the fre-
quency domain.
To turn S-parameter analysis on and off, use
. Use the :SPARame-
ter:MAGGraph commands in this chapter to control the scaling of the S-parameters graph.
Use the
:SPARameter:MARKer
commands to place markers on the graph. S-parameter data
(including phase information) can be saved to files using
“SPARameter:SAVE” on page 10-8
The Fourier transform of the time-domain step response includes trace data starting from the
reference plane.
Restrictions
The S-Parameter subsystem requires TDR mode with Option 202, Enhanced Impedance and
S-Parameter software. Instrument software revision A.06.00 and above.
Windowing
By adjusting the time span and reference plane position, you can use windowing as a time fil-
tering technique to measure the frequency response at a specific location of a test device.
Only the information in the window is transformed allowing you to isolate the physical inter-
connects of a device and view them individually in frequency domain. Adjusting the time
scale (time-per-division) will impact the maximum frequency range and frequency resolu-
tion.
Frequency Span
The maximum usable frequency span is always set for the current conditions when the graph
is displayed. The frequency span is dependent upon the time span used and the points-per-
waveform setting. The time span (acquisition interval) for the Fourier transform equals the
time-per-division setting multiplied by the number of display graticules (divisions) that the
trace occupies.
Consider the situation where the reference plane is at or beyond the display's left edge. In
this case, data from the entire ten display divisions is used. If the time scale is 10 ns/div and
the points-per-waveform setting is 1024, the maximum frequency will be 5.1 GHz.
F
maximum
points-per-waveform
2 time/division
(
)
display divisions
(
)
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Содержание 86100A
Страница 18: ...1 14 Introduction Status Reporting Figure 1 4 Status Reporting Data Structures...
Страница 19: ...1 15 Introduction Status Reporting Status Reporting Data Structures continued...
Страница 94: ...2 40 Sample Programs BASIC Programming Examples...
Страница 124: ...4 16 Root Level Commands VIEW...
Страница 125: ...5 DATE 5 2 DSP 5 2 ERRor 5 3 HEADer 5 4 LONGform 5 5 MODE 5 6 SETup 5 7 TIME 5 7 System Commands...
Страница 132: ...5 8 System Commands TIME...
Страница 140: ...6 8 Acquire Commands SWAVeform RESet...
Страница 152: ...7 12 Calibration Commands STATus...
Страница 192: ...11 12 Display Commands SSAVer...
Страница 202: ...12 10 Function Commands VERTical RANGe...
Страница 203: ...13 AREA 13 2 DPRinter 13 2 FACTors 13 3 IMAGe 13 3 PRINters 13 4 Hardcopy Commands...
Страница 316: ...21 12 TDR TDT Commands Rev A 05 00 and Below STIMulus...
Страница 332: ......
Страница 353: ...26 DISPlay 26 2 LOAD 26 2 SAVE 26 3 XOFFset 26 3 XRANge 26 3 YOFFset 26 3 YRANge 26 4 Waveform Memory Commands...