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仪表的稳定度是一项重要指标,虽然某些仪表都带有校准设备,但在使用过程中不可能经常校准,如增益不够稳定,则同一讯号测试结果将时大时小无所准绳。所以必须保证在一定环境条件下,连续使用若干小时而仪表增益的变化不得超过允许测试误差的范围。402型选频电平表要求,以开机半小时为标准,连续开机器四小时增益变化不超过0.05奈。实际上我们目前已能做到0.02奈,基本上可认为是比较稳定的。
The stability of the instrument is an important indicator, although some instruments are equipped with calibration equipment, but in the course of the use of calibration is not often, such as the gain is not stable enough, the same signal test results will be large and small when nothing. Therefore, we must ensure that under certain environmental conditions, continuous use of a few hours and the change of instrument gain shall not exceed the allowable range of test error. 402-type frequency selection level meter requirements, half an hour to boot as a standard, continuous open four hours gain change of not more than 0.05 Chennai. In fact, we have been able to achieve 0.02 Nana, which is basically considered to be relatively stable.