Fnirsi SG-004A signal generator test and what's inside

Testing an SG-004A signal generator, made and donated by Fnirsi, taking a peek inside. Not a typical signal generator, probably should be called a process calibrator. It's good to read and simulate various sensors (pressure, temperature, motor or engine speed...), process parameters, to test actuators, for development and calibration in automation systems and such. It can read, simulate and convert sensor signals in the form of a voltage, current, frequency, PWM duty cycle, ...
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