1, Model and Meaning
Meter model is the use of letters and numbers arranged to represent the category code + group code + design number + the derivative number.
For example, our common multi-function meter: DTSD1150, DSSD1150, DTS(X)1150). Category Code: D-meter; Group Code: Phase-S-three-phase three-wire, T- three-phase four-wire, that purpose -D- multifunction; Design number: Each manufacturer's design sequence number is different, such as Radarking is 1150.
2, To be purchased in the regular manufacturer.
Meter is part of the national compulsory measurement instruments, according to the law of measurement, the selected meter must have the provincial and above technical supervision department issued a manufacturing license measuring instruments (CMC card), which is the power meter manufacturers must have the conditions And the legal formalities that must be fulfilled. However, the current market competition is fiercer. When purchasing electronic watt-hour meters, we can compare other documents that certify product quality, verification reports of authoritative departments, life test reports, and ISO9000 measurement certification.
3, According to their functional needs of the use of energy meter, to be just right to use, too many functions, if you do not have access, but also wasteful.
4, Determine the type of power meter required, but also know the current range. The user can choose the current range according to the load, if the load is large (many household appliances), then select the high current meter (40A, 50A, ...); small power load, the choice of small current meter (6A, 10A, 20A).