Quantum Data 881 - Manual (Page 294)

276 Chapter 9 Analyzing Digital Sources and Cables
Pseudo-random noise generation commands
This section provides command line procedures for configuring and controlling the
transmission of pseudo-random noise from the generator’s output.
Configuring pseudo-random noise output parameters
The following is an example of using commands to configure pseudo-random noise output
parameters.
To generate pseudo-random noise:
1. Connect the HDMI cable or DVI to HDMI cable between an HDMI IN connector on the
generator and the output interface on the device under test.
2. Using a terminal emulator, establish a terminal connection with the generator. Refer
to “ Establishing a terminal session with the generator ” on page 31.
3. Choose the HDMI-H (or HDMI-D) item by entering the following commands:
XVSI 4 (or 3) // Selects the HDMI-H or HDMI-D interface
ALLU // Applies the interface setting to the generator
4. Choose the connector to which the transmit device is connected by entering the
following commands:
XVSI:IN 1 // Selects the HDMI-1 input connector
ALLU // Applies the interface setting to the generator
5. Enter the following commands to configure the pseudo-random noise parameters.
PNSA 1 // sets pseudo random noise to be calculated each pixel clock
PNSM 0 // sets pseudo random noise test to run in auto mode
PNSG 1 // enables the pseudo-random noise test
PNGU // turns on the pseudo-random noise test
Analyzing pseudo-random noise from an external source
The following example tests an HDMI/DVI transmit device’s pixel data using
pseudo-random noise generated by an external source.
To analyze pseudo-random noise from an external source:
1. Connect the DVI or HDMI cable between an HDMI IN connector on the generator and
the output interface on the device under test.
2. Using a terminal emulator, establish a terminal connection with the generator. Refer
to “ Establishing a terminal session with the generator ” on page 31.
3. Choose the HDMI-H (or HDMI-D) item by entering the following commands:
XVSI 4 (or 3) // Selects the HDMI-H or HDMI-D interface
ALLU // Applies the interface setting to the generator