Wattmeters and varmeters Ts42303, Ts42308 are intended for measurement of active or reactive power in three-phase three-wire AC circuits of 50...60 Hz at uniform or non-uniform phase load. Wattmeters Ts42303/1, Ts42308/1 are intended for measurement of active power in one-phase AC circuits of 50, 60, 500, 1000 Hz. Frequency meters Ts42304, Ts42306, Ts42307 are intended for measurement of AC frequency. Power factor meters Ts42305 and Ts42309 are intended for measurement of power factor in in three-phase three-wire AC circuits of 50 Hz with symmetry of line voltage and balanced phase load. The meters are made based on an electronic converter of input signal into DC signal and a moving-coil meter arranged in one case. Buy