范围本标准叙述了评价录象和显象用磁带性能所使用的测量方法。 1.测试环境若无其他规定,则一切性能测量均须在温度为20±1℃(68±2°F),湿度为48～52％,大气压力在860～1060毫巴之间的条件下进行。供测量用的试样应事先在上述条件下置放24小时,以保证测试结果正确无误。这就是本标准所需的标 Scope This standard describes the measurement method used to evaluate the performance of video and imaging tapes. 1. Unless otherwise specified in the test environment, all performance measurements shall be made at a temperature of 20 ± 1 ° C (68 ± 2 ° F), a humidity of 48 to 52% and an atmospheric pressure of 860 to 1060 mbar get on. For the measurement of the sample should be placed in advance under the above conditions for 24 hours to ensure that the test results are correct. This is the standard required by the standard