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① The branch shows a negative current. The negative current is greater than 2A, but when the ruler gauge has no negative current, it needs to be replaced;
② No current is displayed on the branch circuit. The current meter measures the current and is greater than 1A, which needs to be replaced;
③ The host interface Hall number display is incorrect, for example, the following figure:
If 6 halls are connected on site, the above figure shows that 24 is correct. If it shows 0, you need to determine which hall is faulty before replacing