Connectors for frequencies below 3 MHz for use with printed boards. Detail specification for circular connectors for low-frequency audio and video applications such as audio, video and audio-visual equipment|Gauges, Dimensions, Low frequencies, Dynamic testing, Contact resistance, Approval testing, Temperature, Designations, Rated frequencies, Printed circuits, Detail specification, Electrical resistance, Electric connectors, Audio equipment, Testing conditions, Circular shape, Voltage, Assessed quality, Force, Mechanical testing, Electric contacts, Printed-circuit boards, Performance testing, Electrical components, Environmental testing