Pulse source and TDR/TDT analysis (option R&S RTP-B7/K130)
R&S
®
RTP
989User Manual 1337.9952.02 ─ 12
Requirements
TDR/TDT analysis requires the pulse source option R&S RTP-B7.
Cabling requirements:
●
Use only high-quality double-shielded RF cables. Two suitable cables are delivered
with the pulse source option R&S RTP-B7.
●
Use low loss cables with frequency range that fits the oscilloscope bandwidth.
●
Consider the recommended cable length: 0.5 m < length < 3 m.
●
For differential TDR/TDT, use a matched pair cable, e.g. R&S RT-ZA17.
Calibration standards
During calibration, you measure the connecting cables of the measurement setup
against standards. Calibration standards assumed to be ideal.
●
Short with RF quality: a standard short is delivered with the pulse source option
R&S RTP-B7. You can use other shorts with electrical length 0 ns … 2 ns. Default
value is the R&S RTP-B7 short.
For differential TDR, the short does not require ground connection, the calibration
is fully differential.
●
Open (DC)
●
Match (DC): a standard 50 Ω match is delivered with the pulse source option
R&S RTP-B7. You can use another match with 50 Ω±10% for single-ended mea-
surements, or 100 Ω±10% for differential measurements.
●
Through (RF): the length is assumed to be zero.
Calibration results
After successful calibration, the frequency response of the short and through measure-
ments are displayed. Steep dips in the graph indicate high attenuation within your
desired bandwidth, which impairs the performance. To improve the measurement,
reduce the bandwidth of the system. To check the impact of the frequency response
calibration on the time domain waveform, you can disable the usage ("Use frequency
response calibration"). Without frequency response correction, only the rescaling to the
TDR/TDT measurements is performed.
The calibration results are used for correction of subsequent measurements and can
be saved in a file for later usage.
Correction
Calibration results are used for correction of the signal in two ways:
●
DC scaling using results of open, short and match calibration.
●
RF correction and deembedding of transmission loss based on short calibration.
The R&S RTP corrects for the transmission loss of the system, but not for multiple
reflections between DUT and oscilloscope.
TDR/TDT analysis (option R&S
RTP-K130)
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