HDMI

HDMI Testing Service

Overview

High-Definition Multimedia Interface (HDMI) is a high-speed digital interface widely used between consumer electronics, computers, and display devices. As resolutions and data rates continue to increase, the requirements for HDMI signal integrity have become more stringent. The purpose of HDMI physical layer testing is to verify whether signals maintain sufficient quality during high-speed transmission, ensuring stable delivery of video and audio signals.

Common Devices Under Test

HDMI testing is commonly applied to the following types of devices:

Televisions and Monitors
Blu-ray Players, Set-Top Boxes, and Home Theater Systems
Gaming Consoles (such as PS5, Xbox)
Computers and Laptops
Graphics Cards and Embedded Systems
HDMI Cables and Connectors
Mobile Devices (outputting video via HDMI adapters)

HDMI Test Standards

The main test standards for HDMI include:

Standard	Properties
Electrical Characteristics	Such as voltage swing, signal levels, and impedance matching to ensure signal transmission meets design specifications.
Timing Parameters	Validating the device’s ability to handle high data rates, especially for 4K, 8K, and 10K resolutions.
Signal Integrity	Evaluations such as eye diagram quality, jitter, and crosstalk to ensure high-speed signals maintain quality throughout transmission.
Environmental Requirements	Considering the effects of temperature, humidity, and power supply noise on signal performance and test accuracy.

Common HDMI Signal Integrity Physical Layer Test Items

The following are common physical layer test items for HDMI:

Eye Diagram
Clock Jitter Analysis
Differential Impedance
Insertion Loss & Return Loss
TDR (Time-Domain Reflectometry)
EMI Test
Pre-emphasis & Equalization

Commonly Used Test Instruments

When performing HDMI physical layer testing, the following instruments are typically used:

Instrument	Properties
High-Speed Oscilloscope (≥20 GHz Bandwidth)	For eye diagram, jitter, and TDR measurements to analyze high-speed signal quality.
Bit Error Rate Tester (BERT)	Used for link-level reliability testing to verify data transmission stability.
Vector Network Analyzer (VNA)	For S-parameter measurements, including insertion loss and return loss analysis.
TDR Analyzer	Specifically used for time-domain impedance testing to detect mismatches and discontinuities.
Signal Generator / Protocol Analyzer	Simulates Source and Sink devices and performs protocol-level analysis to ensure compliance and proper communication.