S220B dual-clamp intelligent phase voltammeter is a multi-functional smart instrument designed for field test. It consists of a host, two current clamps and four test leads. the host contains a 3.5-inch true color LCD screen with graphical menu interface, which makes measured parameters displayed on the screen timely and clearly. Current clamp integrated handle design makes it easy to operate and suits for cable-intensive places. In the case where the loop is not open, the instrument can measure two-way AC voltage, current, voltage phase, current phase, voltage and current phase, frequency, active power, reactive power, apparent power, and power factor at the same time. It can also determine the transformer wiring group, and inductive and capacitive circuit, test the secondary circuit and the bus differential protection system, read out the phase relationship between the differential protection of CT in each group, check the instrument wiring is correct or not, overhaul wiring equipment, and so on, providing a safe, accurate and convenient intelligent instrument for electricity inspectors. It can be used in the field of electricity, petrochemical industry, metallurgy, railway, meteorology, industrial and mining enterprises, research institutes, measurement departments and so on, and is especially suitable for electric billing system and relay protection system.

the instrument has a USB interface, and is capable to store 99 sets of data. Operators can upload the stored data to the computer through the software in the system to achieve reading, querying, saving, reporting and printing of the historical data.