MEATEST, s.r.o.
M-142 Multifunction Calibrator
User Manual v54
73
Current converter
The current converter and current amplifier form a separate design block based on a transconductivity converter
with 10
-5
S nominal conversion ratio.
A six-range switched current amplifier connects to the output of the current converter. Its input is fitted with
overload protection and a separate circuit which measures the shift between output voltage and current in 2 and
20 A current ranges. The output stage is push-pull in B class.
Resistance and capacitance simulator
Resistance and capacitance are simulated using an electronic simulator.
Hi and Lo are calibrator’s output terminals. The stage including U1 operating amplifier converts voltage to
current. U2 is a separation amplifier. R1 to R5 and C1 to C3 are range impedance. DA converter has 0 to +1 and
0 to -1 conversion ration and allows the simulation of resistance and capacitance values different from the range
impedances. The output stage increases the permitted current load of the output.
Frequency synthesizer
ATTENTION
The simulator’s output voltage (Hi - Lo terminals) is limited to 8 Vpk.
power stage
input
power stage
DA convertor