Power meter unit

Power meter unit .
This demonstration meter  shall be suitable to  measure the true rms of voltages and currents.
Technical features:
•Voltage 3/10/30/100/300/1000 V (input resistance 10 MΩ)
•Current 0.1/0.3/1/3/10/30 A
•Continuous overload protection in all ranges.
•Auxiliary supply: single-phase from mains
Measurement modes:
RMS: AC+DC, total true r.m.s. value
RMS: AC, true r.m.s. value of alternating part
AV: AC+DC, arithmetical average value, with 2 leds polarity indication
Switchover must be possible for all ranges and measurements modes at any time.
This module must have insulated type front panel with the electrical scheme and  safety terminals. One selector and three switches shall be included in this panel.