Introduction to ZY5018 Handheld Digital Selective Level Meter

The ZY5018 Handheld Digital Selective Level Meter and the ZY5068 Handheld Digital Level Oscillator form a set of portable field test instruments. They are not only suitable for testing the baseband characteristics of communication systems but also for the commissioning, activation, and maintenance testing of power line carrier communication equipment and high-frequency channels for power protection, as well as for related teaching and experiments in colleges and universities. The instruments adopt ARM micro-power consumption, high-performance microprocessor chip technology, a 3.5-inch color LCD display, a fully Chinese menu-based interface, digital keyboard operation, built-in rechargeable lithium batteries, and AC/DC power supply. This makes the instruments compact, lightweight, powerful, stable in performance, clear in display, and very easy to operate. Measurement data is automatically stored and can be queried on the device, or downloaded to a USB flash drive via the USB port for transmission to a PC for processing or report printing. The instruments feature functions such as automatic level calibration, automatic range switching, AFC frequency automatic tracking, fast automatic search, near-end synchronous measurement, remote dual-device automatic testing, impedance measurement, and noise measurement.

Main Features of ZY5018 Handheld Digital Selective Level Meter

Instrument transmission level: -77.9dB to +20dB, with excellent frequency response and level stability, and extremely high output purity, making it an ideal high-quality signal source. The output port is equipped with an automatic protection circuit, preventing damage to the output circuit due to strong signal injection, making it particularly suitable for testing high-frequency transceivers in relay protection.

Instrument operating frequency measurement range: 200Hz to 1700kHz, covering frequency bands from voice channels to 300-channel group channels, with a resolution of 1Hz and frequency accuracy of ±1×10?? ±1Hz. Frequency adjustment is fully digitalized, making operation convenient. Frequency increment adjustment is user-selectable, with a minimum step of 1Hz.

Automatic level calibration: Calibrates the 0dB level for different measurement bandwidths at any time.

Level measurement range: -90dB to +50dB, with a resolution of 0.01dB.

Automatic unit switching: Three measurement units—dB, dBm, and mV—are automatically switched by pressing the unit key, directly displaying test results without calculation.

AFC function: Can track the measured signal across the entire frequency band for extended periods.

Fast automatic search: Automatically finds unknown signals and quickly and accurately measures their level and frequency.

Selective measurement: Features two bandwidths, 25Hz and 1.74kHz, with excellent selectivity and very low inherent distortion, allowing the level meter to be used not only for level and crosstalk noise measurement but also for waveform analysis.

Near-end synchronous measurement, remote dual-device automatic testing: Automatically measures high-frequency parameters of carrier channels and high-frequency protection channels, such as level, attenuation, amplitude-frequency characteristics, weighted noise, and line impedance.

Impedance measurement: Measures carrier channel line impedance, directly reading impedance modulus values from 20Ω to 1200Ω, with a display resolution of 0.1Ω.

Noise measurement: Offers two modes—point frequency and automatic (sweep frequency) measurement. Results of automatic measurements are directly read and automatically stored.

Additionally, since the level meter's high-level input can reach up to +50dB, it is suitable for matching measurements with various communication equipment using different input and output impedances. The high-level measurement input impedance is approximately 30kΩ, making it suitable for bridging measurements.

Both the ZY5018 Handheld Digital Selective Level Meter and the ZY5068 Handheld Digital Level Oscillator feature a handheld design, with internal circuits adopting a three-layer stacked structure and modular design, connected between layers via pin links. This makes the instruments compact, lightweight, highly reliable, portable, and suitable for use in various conditions and environments.

Main Technical Parameters of ZY5018 Handheld Selective Level Meter

Power Supply Methods for ZY5018 Handheld Selective Level Meter