M-142 Multifunction Calibrator
MEATEST, s.r.o.
74
User Manual v54
Frequency synthesis circuitry allows fine setting of frequency in the whole calibrator’s range. Frequency
synthesis uses DSP circuits with basic frequency 20 MHz.
Power and energy mode
In the power/energy mode, the calibrator supplies the set voltage to Hi-Lo terminals and the set current through
+I – -I terminals. Both signals have defined phase shift according to the set power factor, if AC mode is set.
Output voltage is obtained from 200 V AC voltage range. Output current is obtained from 2 or 20 A current
range. The output current generator is independent of the output voltage generator and synchronized by the
microprocessor’s crystal oscillator. There is a phase shift between the signals of the output current generator and
output voltage generator according to the set power factor. The phase of output current and voltage is compared
by a phase comparator and compared to a reference value representing the set power factor; the output drives a
voltage-controlled phase shift element, which controls the phase of output current.