... (when harmonic is serious, it is better to use manual settings for testing frequency so as to assure the reading stability) 5 ... :0.05×(specified accuracy)per°C 12) Electromagnetic Compatibility: In an RF field of 3V/M,accuracy=specified accuracy , Otherwise accuracy ... + graduation #) ambient temperature: 18°C ~ 28°C, Humidity 80%, frequency for voltage, current: 45 Hz ~ 65 Hz Three Phase Digital Power ...