Quantum-data 802BT Bedienungsanleitung PDF herunterladen (Seite 144)

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134 Chapter 8 Analyzing Digital Sources and Cables

GPER? // returns the pixel error rate in errors per billion

GNPT? // returns the number of pixels measured in billions

GCET? // returns the number of bad pixels for R, G, B components

GFED? // returns information about the first error encountered

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 the receive 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

“Setting up a terminal connection with the generator” on page 14.

3. Enter the following commands to configure the generator to output a digital signal

(HDMI or DVI):

SROP 2 4

This removes analog friendly mode and configures the generator to output either a DVI

or HDMI signal depending on the interface hardware the generator is equipped with

(DVI or HDMI).

4. (optional) Enter the following commands to set the status display mode:

SROP 8

5. Enter the following commands to configure the pseudo-random noise parameters.

PNSF 1 // selects external timing source for pseudo-random noise

PNST 1 // specifies QDI-BCM algorithm

TMAU // initiates measurement of timing from external source

PNSA 1 // sets pseudo random noise to be calculated each pixel

PNSM 0 // sets pseudo random noise test to run in auto mode

PNSP 100 // sets pseudo-random noise for 100 “multi-shots”

PNAU // loads the generator with the pseudo-random noise settings

Note: The test will stop automatically if configured to run in the single or multi-shot

mode. If you initiate the test in the continuous mode, you will have to enter a carriage

return to halt the test after PNAU is invoked.

6. Enter the following commands to view the results of the test.

GPER? // returns the pixel error rate in errors per billion

GNPT? // returns the number of pixels measured in billions

GCET? // returns the number of bad pixels for R, G, B components

GFED? // returns information about the first error encountered

Testing the analyzer

The following example verifies the analyzer’s pseudo-random noise analysis capability.

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