3
1.The principle diagram
2.Working principle
The instrument measurement circuit includes a current measurement circuit and a current
measurement circuit. (Voltage test can be added as required) The volt-ampere
characteristic function can be expanded.
The current measurement loop includes micro-current zero-impedance CT,
programmable amplifying circuit and sampling circuit.
The voltage measurement circuit includes a PT isolation signal acquisition circuit, a
program-controlled amplifier circuit and a sampling circuit.
The 16-bit single-chip microcomputer uses computer digital real-time acquisition method,
by measuring the voltage signal amplitude, according to the voltage proportional
relationship, the high-voltage measured voltage value can be calculated, and the
automatic timing function can be realized by comparing the measured voltage signal
amplitude with the set voltage value. According to the current proportional relationship,
the output current of the device can be calculated, and the overcurrent protection function
can be realized by comparing the amplitude of the measured current/voltage signal with
the set value.
IV.Panel description
1. Working power switch: Press the switch ammeter and control circuit to start working.
2. Output adjustment knob: After starting the test, the adjustment knob outputs current
from the "L1, L2" ends.
