標準號：IS 7204 Pt.2-1980
發布日期：1980/8/1 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：1.1 This standard ( Part III ) specifies the measuring equipment and techniques to be used in assessing the radio-frequency interference generated by stabilized power supplies designed to supply dc power from an ac or dc source for application such as in computers, communication, laboratories and industry.1.2 It also specifies the limits of radio-frequency interference voltages measured at the source terminals and at the load terminals. It is considered that in this way it will be possible to obtain for the great majority of stabilized power supplies, a reasonable degree of compatibility with general electrical and electronic equipment including sensitive measuring instruments, communications equipment and computers.1.3 The main requirements of this standard relate to power supplies for which the source current required does not exceed 25 A.However, additional requirements are proposed for cases where the source current required exceeds 25 A.Note — The main requirements of this standard relate to the frequency range 0·15 MHz to 30 MHz. It is possible that special applications may require tests to be made at higher frequencies, and characteristics of the measuring equipment for frequencies up to 1 000 MHz have, therefore, been included in Table 1.1.3.1 In the case of power supplies for special applications where the radio interference requirements are likely to be more onerous, the measuring equipment and techniques shall be as described in this standard but the limits shall be agreed between the manufacturer and the user.1.4 Requirements for measurements of radiated interference have not been included in this standard as it is considered that if compliance with the limits for conducted interference is obtained, the power supply should be suitable for operation in most laboratory and industrial environments. Limitation of radiated interference should therefore be a matter of agreement between the manufacturer and the user.