Can the universal meter charge the lithium power battery?

A few days ago, a good young man called us and said that when he used the Agilent 34401A6 half-digit meter to measure the voltage of the lithium power battery, there was a bizarre measurement phenomenon: at the beginning of the test, the lithium power battery voltage was 4.23621V. But then, the multimeter showed that the results have been rising, from 4.23621V to 4.23622V, 4.23623V, 4.23624V........ After a few minutes, the speed of change is relatively slow, after which he changed another one. Taiwan 34401A tested, or the same situation, even replaced a few batteries, the same situation. We are also very confused, and even suspected that the multimeter's voltage measurement file is charging the lithium power battery!

Later, after a step-by-step communication with him, it was discovered that the younger brother did not preheat after using the multimeter, and immediately tested it. We recommend that he pre-heat the multimeter for half an hour before each measurement before testing to see if the situation has improved. After he tried it, the situation was significantly improved, the test results were stable, and the "charging function" of the multimeter disappeared.

I believe that many colleagues use the test and measurement equipment, usually do not go through sufficient warm-up time after the start-up, immediately test, think that boot preheating is a waste of time, in fact, if the test accuracy requirements are not high, this is also true . But to ensure very high precision and consistency, it is different. I believe that after reading the test experience of the above-mentioned sage, the importance of preheating the instrument may have a relatively intuitive understanding.

In fact, in the instrument technical data, it is generally indicated that the indicator is obtained under the condition of preheating for 30 minutes or 1 hour. The following figure is the technical index of the 34401A digital multimeter. The indicator also specifies the 1-hour preheating condition. .

Therefore, in order to ensure the stability of the performance of the measuring instrument and achieve the performance index of the instrument, when using the instrument for testing, it is necessary to first preheat and let the instrument enter the normal measurement state, so that your test can be more guaranteed.

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