在检定PHS—2型酸度计过程中,发现指针颤抖。当作PH测量时,指针在左右范围均颤抖,当作±mV测量时,指针在左范围颤抖,而且当测量大于PH7时出现正差大,小于PH7时出现负差大,出现示值非线性误差。此类故障看起来很复杂,但具体检修起来并非如此。 首先,对稳压电源、电极接线柱、屏 In the test PHS-2 pH meter found during the pointer shaking. When used as a pH measurement, the hands trembled in the left and right ranges. As a ± mV measurement, the hands tremble in the left range, and when the measurement is larger than PH7, there is a large positive difference. When the ratio is smaller than PH7, there is a large negative difference. error. Such failures can seem complicated, but not so for the specific overhaul. First of all, the power supply, electrode terminal, screen