Oscilloscope, Multimeter and Signal Generator Fnirsi 2C53T 3‑in‑1 Portable

The FNIRSI 2C53T is a portable 3‑in‑1 instrument combining a two‑channel oscilloscope, a digital multimeter and a signal generator in a single handheld unit. It provides 50 MHz analog bandwidth per channel, 250 MSa/s sampling, an 8‑bit ADC with 16 kpoints memory buffer per channel (pre/post‑trigger), and a built‑in signal generator up to 50 kHz. The device features 1 MΩ ∥ 15 pF input impedance with AC/DC/GND coupling, a 2.8‑inch 320×240 color display, rugged ABS housing with silicone overlays, and an internal rechargeable battery for mobile use. Safety features include CAT II 300 V certification, dual ceramic fuses and an overvoltage protection circuit. Waveform saving and firmware updates are supported.

Advantages

The unit integrates oscilloscope, multimeter and function generator capabilities into one compact, battery‑powered enclosure for field and bench use. A professional ARM+FPGA+high‑performance ADC architecture enables fast triggering and accurate waveform reproduction. Dual isolated channels reduce interference between inputs, while the color display with persistence modes and multiple timebase/trigger options facilitates clear observation of signals and phase relationships. Built‑in protections, durable mechanical design and the ability to export waveform images or save screenshots make the instrument practical for a wide range of measurement tasks.

Suitable for

• Electronic troubleshooting and circuit debugging
• Repair and maintenance of power supplies and converters
• Testing filters, amplifiers and analog circuits with the built‑in signal generator
• Portable field measurements and educational laboratory work

Key specifications

• Display: 2.8‑inch color screen, 320 × 240 pixels
• Oscilloscope channels: 2 independent inputs
• Analog bandwidth: 50 MHz per channel
• Sampling rate: 250 MSa/s
• Memory depth: 16 kpoints per channel (pre/post trigger)
• ADC resolution: 8‑bit
• Input impedance: 1 MΩ ∥ 15 pF
• Coupling: AC / DC / GND
• Time base range: 10 ns to 20 s
• Vertical sensitivity: 10 mV/div to 10 V/div
• Maximum measurement voltage: ±400 V
• Trigger modes: Edge, Pulse Width, Video, Slope; AUTO/Normal/Single
• Display modes: Y‑T, Rolling, X‑Y
• Signal generator: single channel, 1 Hz – 50 kHz, multiple waveforms, adjustable amplitude and offset
• Multimeter functions: DC/AC voltage and current, resistance, capacitance, diode, continuity, temperature; up to 19999 counts
• Battery: rechargeable lithium‑ion 3000 mAh (up to ~3–4 h typical operation)
• Charging: USB‑C (5 V/1 A)
• Dimensions and weight: 167 × 89 × 35 mm, ~300 g

How to use

Connect the relevant probes for oscilloscope or multimeter measurements and select the required input coupling and vertical/horizontal scales on the device. Use the AUTO function for automatic range and trigger setup when observing unknown signals, or choose Manual/Single/Normal trigger modes for controlled captures. Configure the signal generator waveform, frequency, amplitude and offset to stimulate the circuit under test. Save waveform images or data to internal memory or transfer them to a computer via USB for further analysis. Observe safety limits and the device’s maximum measurement voltage when probing live circuits.

Usage recommendations

Use standard 10× oscilloscope probes for high‑voltage or high‑frequency signals when appropriate, verify input coupling before measurement, and adhere to CAT II 300 V limits and general safety practices. For longer measurement sessions, charge the battery between uses and update firmware when new releases are available to maintain device functionality.