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This thesis introduces the working principle of the universal counter frequency and period measurement and expounds the important function of the crystal oscillator inside universal counter. This paper designs a system which uses the technologies of time-sharing control and video capture to realize the automatic test of multiple crystal oscillators inside the universal counters at the same time.
Multi-parameter simulator is famous because of its more parameters in use and cumbersome steps in calibration. This paper introduces a device which makes the calibration more convenient without oscilloscope, programmable amplifier, programmable filter and stabilized voltage supply. With this device, the key parameters of simulator can be traced back to National Standard. The paper also gives the feasibility...
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