Product Introduction:
The YTC5111A digital comprehensive level meter is a multifunctional instrument that integrates a wideband level meter, a frequency selective level meter, a noise meter, an impedance meter, and a frequency meter. When paired with the YTC5111B digital comprehensive oscillator, it can form an automatic relay protection high-frequency channel tester. It is a new type of fully digital intelligent instrument with full keyboard operation, full Chinese interface, and high-definition LCD display.
The instrument frequency measurement range is 200Hz to 1700kHz, including all frequency bands from the voice channel to the 300 channel group channel, with a resolution of 1Hz and a frequency accuracy of ± 3 × 10^-6± 1Hz. The frequency adjustment is fully digital and easy to operate. Frequency increment adjustment allows users to freely choose, with a step size of 1Hz. The level measurement range is+50dB to -100dB, with a resolution of 0.01dB. The measurement accuracy is high and the measurement level is stable. Equipped with automatic range and automatic level calibration AFC、 Quick automatic search, near end synchronization, remote automatic measurement and other functions. The instrument adopts a large screen color LCD display with clear display. Various input impedances are suitable for matching measurements with communication equipment. The measurement units of dB, dBm, and mV can be switched directly through the unit key to display the results without calculation. The measurement data is automatically stored and can be queried locally or uploaded to a PC for querying or printing.
Frequency selective measurement has two bandwidths of 25Hz and 1.74kHz, good selectivity, and very low inherent distortion, making the level meter not only used for level and string noise measurement, but also for waveform analysis. This instrument is a handheld and portable structure, with a sturdy overall structure, small size, light weight, and easy operation. The instrument is stable and reliable for long-term use, with high accuracy in input level and frequency. Built in rechargeable lithium battery, both AC and DC power supply can work. When powered by a battery, the continuous working time is about 4 hours. The low battery level buzzer automatically alerts the user to charge the battery, making it very suitable for field use. Meets the requirements of SJ3210 "A" standard of the original Ministry of Electronics Industry, and the environmental conditions comply with Group II regulations in GB 6587.1.

Product features:
　　1.Fully digital, high-definition large screen liquid crystal display (LCD), Chinese character graphic display, menu style operation.
　　2.The transmission level of -77.9dB to+20dB has good frequency response and level stability, and the output purity is extremely high, making it an ideal high-quality signal source. The output port is equipped with an automatic protection circuit, which will not damage the output circuit due to strong signal input, especially suitable for testing high-frequency channels of relay protection.
　　3.The measurement range of the receiving level is -100dB to+50dB, with a display resolution of 0.01dB.
　　4.Equipped with various output and input impedances, suitable for terminal or cross measurement with communication equipment. It has three measurement units: dB, dBm, and mV, which can be switched as needed and displayed directly without conversion.
　　5.With two frequency selection bandwidths of 25Hz and 1.74kHz, good selectivity and extremely low inherent distortion, the level meter can not only be used for level and string noise measurement, but also for waveform analysis.
　　6.The "AFC" function can track the measured signal across all frequency bands, and the automatic search function can quickly and accurately search for the level and frequency of unknown signals being measured.
　　7.The instrument is used to achieve automatic synchronous measurement, automatically measuring high-frequency parameters such as level, attenuation, amplitude frequency characteristics, balance noise, and line impedance of the high-frequency channel. It also has an RS232 serial interface, and the data can be stored and uploaded to a PC for printing and output.
　　8.The instrument can be used for both AC and DC, with a built-in rechargeable lithium battery that can work continuously for 4 hours and has a power consumption of less than 4W.