1.1 This part of ISO 8984 specifies minimum requirements for hand-lever-operated testing and setting apparatus to perform certain tests on fuel injectors for diesel (compression-ignition) engines. These tests are detailed in ISO 8984-2 and are — nozzle opening pressure; — chatter (atomization); — spray pattern; — seat leakage; — back-leakage. This International Standard concerns fuel injectors having a spring-loaded nozzle valve actuated by fuel pressure. It is intended that the specifications form a standard basis. The injector is connected to the apparatus by an adaptor specified by the injector manufacturer. 1.2 This part of ISO 8984 primarily applies to apparatus for testing the injectors of fuel injection equipment for diesel (compression-ignition) engines requiring fuel delivery of up to 300 mm3/(injection × cylinder) at full load. 1.3 No distinction is made between apparatus used in different locations, e.g. laboratories, factories or service stations. 1.4 It is up to the injector manufacturer to specify which tests are to be selected from those listed in 1.1, together with any additional requirements for a particular injector. NOTE 1 The terms used in this part of ISO 8984 are in accordance with ISO 7876-2[6].