44 JJG (RAILWAY) 702-2021, officially titled "Verification Regulation for On-Line Testing Equipment of Railway Track Signals/' was promulgated and implemented by the National Railway Administration in 2021. It applies to initial verification, subsequent verification, and in-service inspection of on-line railway track signal testing equipment, serving as the statutory technical basis for ensuring measurement accuracy and compliance with railway signal testing safety standards. The regulation mandates eight core parameter verifications for on-line railway track signal testing equipment,encompassing SINGLE-FREQUENCY MEASUREMENT, FREQUENCY-SHIFT MEASUREMENT, 25 Hz phase-sensitive track signal measurement, and HIGH-VOLTAGE PULSE TRACK SIGNAL MEASUREMENT. These cover the full spectrum of track signal electrical parameters—frequency, voltage, current, phase, time interval, capacitance, and impedance—meeting on-line testing requirements for installation and commissioning, routine inspection, and fault diagnosis of both station and section track circuits. gg PRACTICAL APPLICATION PROJECTS Single-frequency Measurement — Voltage Measurement Frequency Shift Measurement - Voltage Measurement The signal source outputs a constant frequency-shift frequency (e.g., center frequency 550 Hz, frequency deviation ±55 Hz) and a constant low frequency (e.g., 11 Hz). The output signal from the signal generator is amplified by the ATA-214 high-voltage amplifier to obtain nominal voltage values of 100 mV, 4 V, 10 V, 100 V, and 400 V, and the error values are calculated. The set frequency remains constant (e.g., 3 Hz), with a wave head duration of 5 ms. The output is provided at a head-to-tail ratio of 4:1. After the signal generator output signal is amplified by the ATA-2161 high-voltage amplifier, the wave head voltage outputs are 10 V, 100 V, 200 V, 400 V, and 800 V, with corresponding wave tail voltage outputs of 2.5 V, 25 V, 50 V, 100 V, and 200 V. The head-to-tail ratios are then adjusted to 3:1 and 8:1 respectively, measurements are performed, and errors are calculated. j'ff] SCHEME ADVANTAGES ► The equipment parameters comply with test verification procedures and are fully suited to relevant application scenarios. Website: www.aigtek.com E-mail:[email protected] Address:Bd. 12, CCCC Science andTechnology City, Wei26 Road, High-tech Zone, Xi'an