Fnirsi 2C53T 3-in-1 Digital Oscilloscope, Multimeter and Signal Generator

FNIRSI 2C53T is a compact 3-in-1 measuring device suitable for diagnostics, repairs, and electronics development. It combines a dual-channel oscilloscope, digital multimeter, and signal generator in one body, so it can display signal waveforms, measure common electrical quantities, and generate a test signal without carrying three separate devices. The oscilloscope is based on the FPGA + MCU + ADC architecture and includes a built-in high-voltage protection module; the built-in battery also allows operation without mains power.

The oscilloscope operates at a sampling rate of 250MSa/s on two channels with an analog bandwidth of 50MHz, independently on both channels. The time base is adjustable from 10ns to 20s, vertical sensitivity ranges from 10mV to 10V per division, and input impedance is 1MΩ. Thanks to high-voltage protection, it can measure voltages up to ±400V. Signal capture modes include Auto, Normal, and Single with rising or falling edge selection; the device supports AC and DC coupling and Y-T, scrolling, or X-Y display. Additional features include 8 basic mathematical operations and FFT analysis, adjustable persistence (off/500ms/1s/infinite), and cursor measurements. Captured waveforms can be saved as screenshots or exported for later comparison or documentation, and the device can also be connected via USB-C.

The integrated 4½-digit digital multimeter (20000 counts) measures DC and AC voltage and current, resistance, capacitance, and temperature, and includes diode test and continuity buzzer. Automatic mode detects whether the input is voltage or resistance and switches to the appropriate range. Voltage can be measured up to 1000V DC and 750V AC, current up to 9,999A in both directions, resistance up to 19,999MΩ, and capacitance up to 99,99mF; the temperature probe covers a range of -55 to 1300°C.

The third part of the device is a single-channel DDS signal generator with a frequency range of 1Hz to 50KHz (1Hz step) and adjustable amplitude of 0,1-3,0V. It offers 13 waveform types – sine, square, sawtooth, half-wave, full-wave, positive and negative step waveform, exponential rise and fall, pulse, multi-tone, sinc pulse, and Lorentzian noise – and serves as a test signal source without the need to connect additional equipment.

Control is provided by a 2.8" color display with 320x240 resolution in combination with physical buttons. Power is supplied by a built-in 3000mAh lithium battery with up to 6 hours of runtime, and charging is via a USB-C (5V/1A) connector. The compact body with dimensions of 167x89x35mm and a weight of 300g fits comfortably in a tool bag.