... clamp type meter input: 0-5A or 0-800APower factor: 0.05% or 0.1% (PF 0.5-1) Frequency: 0. ... the value of 3 phase parameters as voltage, current, frequency, energy, power factor and etc. In the field, ... , and manage the data on the computer. This instruments can communicate with computer by RS-232 port, and ... measuring department and comprehensive automation test. ENERGY METER FIELD-TESTING INSTRUMENTS