There are only two ways to modify the electricity price of the 3B meter: one is to use the "write setting card" operation to rewrite the electricity price number by inserting the setting card into the meter, and the meter will be calculated based on the new electricity level. The second is to use the "write setting card" operation to reissue the old setting card of the old meter (the card number should be the original setting card number of the meter that needs to be modified), and modify the electricity price number of the card as required. Insert the reissued setting card into the meter, and the electricity price number can be modified.

There are two points to note when modifying electricity prices: firstly, when setting the electricity price, a new price number should be entered for the new price, rather than modifying the price in the original price number. Secondly, if the electricity price is only partially modified, or if there are still users installing meters at the original price, do not use the original setting card to make modifications. To replace the old setting card with a new price setting card, the original setting card will still use the new setting table.