Measures:
Voltage, current, wattage, power factor, frequency

Features:
* Effective value measurement
* Automatic range switching and zero adjustment
* Embedded PLL and 16 bits A/D converters
* Simultaneously display Vrms, lrms, W, PF value on 4 windows
* All the values of measured signal are True RMS.
* The inner part of the apparatus has double watch dog design, higher reliability.
* With RS-232C serial communication interface
* Meets IEC 61000-3-2 measurement requirements

Specifications:
* Voltage range: AC 75V/150V/300V/600V (Automatic range switching)
* Current range: AC 0.5A/2A/8A/20 (Automatic range switching)
* Input Frequency: 45Hz ~ 65Hz Band: 5KHz
* Maximum instantaneous enable input: 1600V / 50A
* Maximum consecutive enable input: 800V / 24A
* Accuracy: ±(0.4% of reading +0.1% of range+1 digit)
* Insulation resistance: the insulation resistance between signal input terminal, shell and power
  input terminal is larger than 5MΩ
* Withstand voltage: the withstand voltage between signal input terminal and shell, signal input
   terminal and power input terminal in one minute is 1500V.