The rack mountable model 804 and 804A video test generators are optimized for testing modern HDMI flat panel TVs. The 804 video test generator supports testing of HDMI resolutions operating up to 225MHz. The 804A video test generator supports testing of HDMI 4K x 2K resolutions up to pixel rates of 300MHz. This enables testing ultra HD TVs with 4K resolutions at 30Hz and at 50/60Hz using HDMI 2.0 4:2:0 pixel encoding. The 804A also supports testing with HDMI 2.0 21:9 format resolutions at or below 300MHz. These instruments feature four (4) HDMI outputs all active simultaneously for testing HDTVs with multiple HDMI inputs. This eliminates the need for splitters often required for testing each HDMI input on an HDTV. The 804 and the 804A can output component analog and composite analog video as well as HDMI. Switching between video timings and images is fast. The 804 and 804A are equipped with all the standard video timings and test patterns includes support for 3D necessary for testing HDTVs including tests for HDMI protocols such as HDCP, EDID and CEC. The 804 and 804A tests compressed and uncompressed HDMI audio formats using a variety of audio test signals. An HDTV's analog audio inputs can also be tested using the 804's programmable analog audio outputs.