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21-2
TDR/TDT Commands (Rev. A.05.00 and Below)
DCALib
TDR/TDT Commands
The TDR/TDT command subsystem documents the commands used to set up TDR/TDT mea-
surements in instruments with revision A.05.00 and below. If you are programming an instru-
ment with software revision above A.05.00, refer to Chapter 22, “TDR/TDT Commands (Rev.
A.06.00 and Above)”.
All of the TDR/TDT subsystem commands are of the form :TDR{2 | 4}:<command>. The {2 | 4}
option is used to identify the slot in which you have installed the TDR/TDT plug-in module.
Select 2 if the module is in slots 1 and 2; 4 if the module is in slots 3 and 4. For example, if the
module is in slots 3 and 4, and you want to issue the TDR subsystem PRESet command, you
use the command string :TDR4:PRESET.
DCALib
Command :TDR{2 | 4}:DCALib {RPCalib | NORMal | QNORmal}
This command allows you to select the type of differential normalization (or calibration) to be
performed. In TDT mode, the NORMal and QNORmal procedures are equivalent; only the
NORMal parameter is recognized. RPCalib selects reference plane calibration. This option is
provided for backward compatibility. NORMal sets the calibration procedure to differential
normalization. This version of the differential normalization procedure models the coupling
between the test fixture channels, and compensates for its effects. QNORmal sets the calibra-
tion procedure to differential normalization. This version of the differential normalization
procedure, also known as “Quick Normalization”, assumes that the coupling between the test
fixture channels is negligible.
Restrictions Software revision A.05.00 and below. TDR mode.
Query :TDR{2 | 4}:DCALib?
The query returns the select calibration mode.
Returned Format [:TDR{2 | 4}:DCAL] {RPCalib | NORMal | QNORmal}<NL>
Example 10 OUTPUT 707;":TDR2:DCAL QNOR"
HPOLarity
Command :TDR{2 | 4}:HPOLarity {POSitive | NEGative}
Use this command when performing differential measurements with an external step genera-
tor. In the test setup, you can connect either a positive or a negative TDR remote head on the
second channel. This command sets the polarity of the second channel to match that of the
TDR remote head thus ensuring the proper display of the response.
Restrictions Software revision A.04.20 and A.05.00. TDR mode.
Example 10 OUTPUT 707;":TDR2:HPOLARITY NEGATIVE"