:CMODe Subsystem
The :CMODe
subsystem commands control common-mode waveforms in TDR/TDT mode. Common-mode waveforms are not available in any other instrument mode. Common-mode waveforms are most useful when using a TDR Setup configured as a Basic Control Experience where time-domain parameters are not available. You can configure both differential and common mode traces to provide mixed stimulus S-parameters. Before using the commands in this subsystem, the TDR setup must be configured to Differential as the TDR Stimulus Mode. Use the TDR:AMODe
command.
Waveform Identification
In the :CMODe
command syntax, common-mode waveforms are identified by the associated module slot number (from 1 to 4). For example, the following command sets the color of the common-mode waveform of an N1055A TDR module installed in slots 1 and 2.
:CMODe1A:COLor TCOLor8
Traditional modules take up two module slots, either slots 1 and 2 or slots 3 and 4. For these type of modules, the common-mode waveform is identified using the number for the left-most occupied slot. For example, :CMODe1A
or :CMODe3A
, respectively. Single-slot modules could have two channels. In this case, the common-mode waveform of a module installed in slot 4 would be identified as :CMODe4
. Also, when FlexDCA is configured with a simulated extended module, one-slot simulated modules are available that have two channels. The following table show several examples of common-mode waveform identification.
Module Type | Installed Slots |
Source Channels for Differential Waveform |
Differential Channel Waveform Identification |
---|---|---|---|
Traditional Two-Slot, Dual Channel (for example, 86112A) |
1 & 2 | 1A and 2A | :CMODe2A
|
3 & 4 | 3A and 4A | :CMODe3A
|
|
Simulated or Future Single-Slot, Dual Channel |
1 | 1A and 1B | :CMODe1A
|
2 | 2A and 2B | :CMODe2A
|
|
3 | 3A and 3B | :CMODe3A
|
|
4 | 4A and 4B | :CMODe4A
|
This subsystem Requires FlexDCA revision A.04.00 and above.
Example Command Sequence
:CMODe1A:DISPlay ON :CMODe1A:TCOLor 7