:DIFF Subsystem
The DIFF subsystem commands control differential electrical waveforms. In the :DIFF command syntax, differential waveforms are identified by the associated instrument connection number (from 1 to 8) and channel number (from 1 to 8). For example, this command sets the color of the differential waveform of an 86112A instrument installed at connections 3 and 4. Notice connection 3 channel 1 number 3_1 highlighted in red.
:DIFF3_1:COLor TCOLor8
Traditional instruments take up two connections, either connections 1 and 2 or connections 3 and 4. For these type of instruments, the differential waveform is identified using the number for the left-most occupied connection. For example, :DIFF1_1 or :DIFF3_1, respectively.
Single-connection instruments could have two channels. In this case, the differential waveform of an instrument installed at connection 4 would be identified as :DIFF4_1. Also, when Infiniium 2026 is configured with a simulated instrument, one-connection simulated instruments are available that have two channels. The following table show several examples of differential waveform identification.
| Instrument Type | Installed Connections |
Source Channels for Differential Waveform |
Differential Channel Waveform Identification |
|---|---|---|---|
| Traditional Two-Connection, Dual Channel (for example, 86112A) |
1 & 2 | 1_1 and 2_1 | :DIFF1_1
|
| 3 & 4 | 3_1 and 4_1 | :DIFF3_1
|
|
| Simulated or Future Single-Connection, Dual Channel |
1 | 1_1 and 1_2 | :DIFF1_1
|
| 2 | 2_1 and 2_2 | :DIFF2_1
|
|
| 3 | 3_1 and 3_2 | :DIFF3_1
|
|
| 4 | 4_1 and 4_2 | :DIFF4_1
|
Example Command Sequence
:DIFF3:DMODe ON :CHANnel1:FILTer:BANDwidth 20E+09 :CHANnel2:FILTer:BANDwidth 20E+09 *OPC? … // Your code to synchronize execution timing. :DIFF3:DISPlay ON