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U4998A HDMI and MHL Protocol/Audio/Video Analyzer and Generator Module

Product Status: Discontinued | Currently Supported
This product is no longer available

No replacement found for this product.

Key Features & Specifications


  • Maximum data rate of 3.4 Gbps
  • 4K x 2K support for HDMI for HDMI
  • 3D generation and analysis and extended colorimetry and content type support for HDMI
  • 4 GB deep memory

HDMI and MHL CTS test support

  • HDMI 1.4b Source Tests: 7-16 through 7-19, 7-23 through 7-40
  • HDMI 1.4b Sink Tests: 8-16, 8-21, 8-23, 8-29, 8-31 and, in conjunction with the Keysight E4887A TMDS Signal Generator, test 8-25
  • MHL CTS Source Tests: TMDS Coding through, Video Modes through, and Audio Test through
  • MHL CTS Sink / Dongle Tests: System Test /; Video Tests through /, and Audio Tests and

Measurement modes

  • Capture for source compliance testing
  • Generation for sink compliance testing
  • Passive monitoring with pass through and mirror capabilities (optional)

Configuration considerations

  • Requires one of the following modular chassis for operation: M9502A 2-slot, M9505A 5-slot, or U4002A 2-slot modular chassis
  • Requires a host PC for operation: either an M9536A embedded controller or a compatible external host PC from the Tested Computer List Technical Note
  • For host PC configurations, select appropriate PCIe adapter and cable for chassis and host PC combination. Host PC requires Windows XP or Windows 7
  • MHL protocol compliance support is an optional upgrade to the standard HDMI configuration


The Keysight U4998A HDMI and MHL 1.4b protocol / audio / video analyzer and generator module enables you to test your devices to ensure they are compliant to the HDMI 1.4b or MHL 1.2 compliance test specification (CTS). The U4998A directly replaces the N5998A, Keysight’s previous generation HDMI protocol / audio/ video analyzer and generator recommended by the HDMI CTS. The U4998A is recommended by the HDMI CTS 1.4b for 4K x 2K compliance testing (Test 7-39).

The U4998A AXIe-based module is the first instrument to support source and sink compliance testing up to the maximum transition modulated differential signaling (TMDS) data rates of 3.4 Gbps – essential to support 4K x2K resolution. In addition, the module’s wide range of capabilities enable you to test legal codes, basic protocol, packet type, pixel encoding, video format timing, AVI Infoframe, ACR, audio sample packet jitter, deep color, 3D video format, and more.

• Have confidence in obtaining CTS certification on the first pass by performing in-house testing with the same equipment used by ATCs.
• Perform deeper analysis and identify the root cause of failures with the N5998U-DBG option.
• Automate your HDMI testing and remotely control the U4998A using the COM server embedded in the application software.

The U4998A HDMI is controlled by HDMI analysis software running on an external PC. The HDMI analysis software is part of the U4998A.