2004DIN EN 61920:2004-07 Infrared free air applications (IEC 61920:2004); German version EN 61920:2004 / Note: DIN EN 61920 (1999-02) remains valid alongside this standard until 2007-03-01.
2004DIN EN 61920:2004 Infrared free air applications (IEC 61920:2004); German version EN 61920:2004