1. Institute for Metrology and Calibration of Guizhou, Guiyang, Guizhou 550003, China
2. Inspection Institute of Quality Supervision Machinery & Electronics Products, Guiyang, Guizhou 550081, China
Abstract：To measure accurately offset of indication for digital clock and ensure traceability, a calibration method and testing device of digital clock are proposed and designed. The PIN silicon photodiode is used to detect the digital tube of digital clock, the multi-channel detection signal is amplified and compared with the threshold voltage to output TTL, and then the 1PPS is output through the 1PPS generation circuit, which is compared with the standard 1PPS. The experiment show that the delay of the testing device is 223.4ns (U=100.1ns, k=1).
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2020, Vol. 41 
