Kramer Electronics 820 820 is a high performance SDI video (SMPTE 259M)color bar generator. It will output either 525 line or 625 line video color bars on four identical outputs simultaneously. Output - 4 SDI 525 (50Hz) or 625 (60Hz) selectable. Compact Kramer TOOLS - 3 units can be rack mounted side-by-side in a 1U rack space with the optional RK-3T rack.