The FNIRSI 2C53T combines the functions of a 2×50 MHz/250 MSa/s oscilloscope with an 8-bit ADC and 16 kpct memory buffer per channel (pre/post-trigger), a 19999-count multimeter and a 50 kHz signal generator. The input impedance is 1 MΩ ∥ 15 pF with AC/DC/GND connection. The robust ABS housing with silicone cover, the 2.8-inch 320×240 px screen and the 3000 mAh battery (up to 4 hours of operation) guarantee mobility and continuous measurements even in harsh environments. The device is CAT II 300 V certified, with dual ceramic fuses and a flame retardant circuit. With the ability to save waveforms and update firmware, you can always keep track of your results and access the latest features.
The 2.8″ 320x240px display displays waveforms in full color with an “infinite afterglow” feature that keeps the waveform trace on the screen. Y-T, Rolling and X-Y (Lissajous) modes make it easy to observe phase relationships, and high brightness guarantees readability in all conditions. The built-in multimeter with 19999 counters allows you to measure DC/AC, high and low currents, resistance, capacitance, diodes, temperature and continuity (hum). Intelligent protections protect the user and the equipment from overload.
The professional ARM + FPGA + high-performance ADC combination used in desktop oscilloscopes ensures fast triggering and faithful representation of signals. The triggering system offers Edge (rising/falling), Pulse Width, Video and Slope modes with up to 50% pre-trigger and 50% post-trigger mode, so even the shortest anomalies are captured without loss of detail.
The built-in function generator offers voltages up to ±400V and frequencies up to 50kHz and 13 waveforms (sine, square, triangle, sawtooth, ramp, pulse, noise, etc.) with offset and amplitude adjustment in 10mV/div steps, enabling testing of filters, amplifiers and analog circuits without additional hardware.
The AUTO function sets the range and trigger with a single push of a button, allowing you to view the waveform instantly without time-consuming setup. Support for additional Single and Normal modes simplifies work for quick on-site measurements. A screenshot of the waveform can be saved with one click to the oscilloscope's memory or directly to the computer via USB. This facilitates archiving and further analysis of results in any environment.
Two completely independent 50 MHz bandwidth CH1 and CH2 inputs eliminate mutual interference, improving measurement accuracy. The 250 MSa/s sampling rate reproduces PWM pulses and power supply ripple with maximum fidelity.
The silicone-coated ABS plastic housing provides drop and impact resistance, and the gold-plated PCB rails are corrosion-resistant. The 3000 mAh battery guarantees an operating time of up to 3 hours. The fold-out stand allows the device to be placed at any angle, and the ergonomic buttons and USB-C port ensure comfort during handling and charging.

- Screen 2.8 inch HD color display
- Resolution 320 × 240
- Charging specifications USB-C (5 V/1 A)
- Rechargeable battery Lithium-ion 3000 mAh
- Supported functions Oscilloscope, signal generator, multimeter (see function parameters for details)
- Standby time 6 hours (laboratory maximum)
- Language Chinese and English
- Dimensions 167 × 89 × 35 mm
- Weight 300 g

Oscilloscope parameters

- Channels are two-channel
- Sampling 250 MSa/s
- Analog bandwidth 50 MHz (each channel independently 50 MHz)
- Memory depth 1 kpoint
- Impedance 1 MΩ
- Time base range 10 ns 20 s
- Vertical sensitivity 10 mV/effect 10 V/effect (×1)
- Maximum measuring voltage ±400 V
- Trigger mode AUTO/Normal/single
- Display mode Y-T/Rolling/X-Y
- Switching AC/DC
- Path stability OFF, 500 ms, 1 s, ∞.
- Mathematical functions 8 basic operations + FFT
- Waveform dump recording yes
- Waveform image export yes
- Cursor measurement yes

Signal generator parameters

- Channel is a single channel
- Frequency 1 Hz 50 kHz
- Amplitude 0.1 3.0 V

Multimeter parameters

- DC voltage 1.9999 V / 19.999 V / 199.99 V / 1000 V ±(0.5 %+3)
- Alternating voltage 1.9999 V / 19.999 V / 199.99 V / 750.0 V ±(1 %+3)
- Direct current 19.999 mA / 199.99 mA / 1.9999 A / 9.999 A ±(1.2 %+3)
- Alternating current 19.999 mA / 199.99 mA / 1.9999 A / 9.999 A ±(1.5 %+3)
- Resistance 9.999 MΩ / 1.9999 MΩ / 199.99 kΩ / 19.999 kΩ ±(0.5 %+3); 1.9999 kΩ / 199.99 Ω ±(2.0 %+3)
- Capacitance 9.999 mF / 99.99 mF ±(5.0 %+20)
- Temperature -55 °C 1300 °C (-67 °F 2372 °F) ±(2.5 %+5)
- Diode measurement Yes
- Continuity test Yes