Rohde & Schwarz RTP044 - Using TDR;TDT

Pulse source and TDR/TDT analysis (option R&S RTP-B7/K130)
R&S
®
RTP
990User Manual 1337.9952.02 ─ 12
16.2.2 Using TDR/TDT
16.2.2.1 Calibrating the setup
Before you can start TDR/TDT measurements, calibrate the used cables.
You can:
●
Calibrate the setup using the calibration wizard of the R&S RTP.
●
Load a file with results of a previous calibration of the same setup.
●
Use default calibration and correction values.
To calibrate the cables
The calibration procedure is described for single-ended TDR and TDT analysis. If you
need only TDR or only TDT, the procedure is the same but with fewer calibration steps
and fewer measurements.
1. Open [App Cockpit]> "Analysis" > "TDR / TDT"
2. To start a new calibration, select "Start wizard".
If a calibration was loaded or done before, the calibration steps are skipped, and
the measurement dialog box is shown.
3. Select the analysis type: "TDR", "TDT", or "TDR / TDT" (both TDR and TDT mea-
surements).
4. Select the connection: "single-ended" or "differential".
5. Select "Calibrate setup".
6. Connect the cables, and select the input channels:
a) Connect the first cable to the "Ref" connector of the pulse source and to a
channel input. This cable is for TDR measurements.
b) Select the connected channel in the dialog box.
c) Connect the second cable to the "Out" connector. Do not connect the DUT.
d) Connect a third cable to a channel input. This cable is for TDT measurements.
e) Select the connected channel in the dialog box.
f) Terminate all unused connectors of the pulse source.
g) Set up the input channels, in particular, the trigger level and vertical settings.
These settings must remain unchanged during and after calibration.
h) Select "Next".
7. Calibrate with a short:
a) Connect a short to the cable that is connected to the "Out" connector.
b) To change the short, select the edit icon.
c) If you use another short than the delivered standard short, select
"User.defined", and enter the electrical length of the used short.
d) Select "Calibrate".
8. Calibrate with open cable:
TDR/TDT analysis (option R&S
RTP-K130)