FNIRSI DSO 153 Mini Handheld Oscilloscope and Signal Generator DDS

Description

FNIRSI DSO153 Mini Handheld 2-in-1 Digital Oscilloscope & Signal Generator

The FNIRSI DSO153 is a pocket-sized device combining a 1MHz digital oscilloscope with a DDS signal generator. This 2-in-1 design suits electronics hobbyists, students and repair technicians who need portable waveform analysis and test signal generation without bench equipment costs.

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What Makes the DSO153 Useful?

The DSO153 removes the need for separate oscilloscope and function generator equipment. One handheld device measures signals and generates test waveforms. This dual capability fits in a pocket and runs on battery power for field use.

The one-key AUTO function sets measurement parameters automatically. Beginners display waveforms immediately without learning complex oscilloscope settings first. This makes the DSO153 a practical learning tool for students new to electronics.

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Oscilloscope Specifications

The oscilloscope section provides 1MHz analog bandwidth with 5MS/s real-time sampling rate. This specification handles audio circuits, power supply testing and basic microcontroller signal debugging.

Measurement Range

Vertical sensitivity adjusts from 10mV/div to 20V/div in standard 1-2-5 steps. Time base spans 500ns/div to 20s/div, covering signals from audio frequencies to slow sensor readings.

Direct measurement reaches ±40V safely. The included P6100 10X probe extends range to ±400V (800Vpp) for automotive and mains-related circuits. This covers most hobby electronics and repair diagnostics.

Trigger Modes

Three trigger modes handle different signal types:

Auto – displays any input signal immediately without waiting for trigger conditions. Best for exploring unknown signals or continuous waveforms.

Normal – waits for valid trigger events before updating the display. Use this for stable viewing of repetitive signals.

Single – captures one-shot events then stops. Ideal for switch bounce, startup transients or intermittent glitches.

AC and DC coupling options filter signal components as needed. AC coupling removes DC offset for viewing small signals riding on larger voltages. DC coupling shows the complete signal including DC level.

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Signal Generator Specifications

The built-in DDS signal generator outputs 14 waveform types. Maximum frequency reaches 10kHz with amplitude adjustable from 0.1V to 3.3V peak-to-peak.

Available Waveforms

Sine wave – for audio testing and filter response measurement

Square wave – for digital timing verification and clock signals

Sawtooth wave – for ramp generation and sweep testing

Half wave and full wave – for rectifier circuit simulation

Positive step and negative step – for transient response testing

Exponential rise and exponential fall – for RC circuit analysis

Noise – for random signal testing

DC signal – for bias voltage generation

Multi-tone – for audio frequency mixing

Sinc pulse – for impulse response testing

Lorentz wave – for specialised waveform applications

Duty cycle adjusts from 0% to 100% for square and sawtooth waveforms. The 3.3V maximum output matches common microcontroller logic levels directly.

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Display and Controls

The 2.8-inch TFT LCD provides 320×240 pixel resolution for clear waveform viewing. Screen indicators show trigger mode, coupling method, time base, vertical sensitivity and probe ratio at a glance.

Navigation uses a trackwheel with left, OK and right positions plus dedicated up/down buttons. The MODE button switches between oscilloscope and signal generator functions. RUN button starts and stops acquisition.

Long-pressing AUTO calibrates the baseline for accurate DC measurements. This compensates for temperature drift and ensures measurement accuracy.

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Portability Features

The DSO153 weighs approximately 100 grams. Dimensions measure 99×68×19mm, fitting shirt pockets and small tool pouches easily.

A 1000mAh lithium battery provides roughly 4 hours continuous operation. USB Type-C charging at 5V/1A allows power bank operation for extended field work. The device works while charging for unlimited bench use.

Firmware updates install directly via USB on Windows 10 or later systems. FNIRSI releases periodic updates adding features and fixing issues based on user feedback.

Multiple language options include English, Chinese, Japanese, Korean, German, Spanish, Portuguese and Russian.

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Practical Applications

Arduino and Microcontroller Projects

Debug UART serial communication timing and verify PWM outputs for motor control or LED dimming. The signal generator provides test inputs without additional equipment. Check I2C and SPI signals at lower clock speeds within the 1MHz bandwidth.

Audio Electronics

Test guitar pedal circuits, synthesiser oscillators and small amplifier stages. Generate test tones for frequency response measurement. View audio waveforms to identify distortion, clipping or noise problems.

Power Supply Testing

Measure ripple voltage on DC outputs. Check switching frequency on SMPS circuits within bandwidth limits. The ±400V range with 10X probe handles offline power supply measurements safely.

Educational Use

Students learn oscilloscope fundamentals on affordable personal equipment. The signal generator demonstrates waveform types, frequency relationships and circuit responses. One-key AUTO removes barriers for complete beginners.

Field Service and Repairs

Lightweight pocket design fits toolkits for on-site diagnostics. Battery operation removes mains power dependency. The rugged handheld format withstands workshop handling.

Automotive Diagnostics

Measure sensor output voltages and basic signal waveforms. Check charging system ripple and injector pulse timing. The portable format suits under-bonnet work without trailing cables.

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What’s Included

DSO153 Standard Package:

• DSO153 oscilloscope and signal generator unit
• Alligator clip probe
• USB Type-C charging cable
• Lanyard
• User manual

DSO153 Plus Package adds:

• P6100 10X high voltage probe (extends measurement to ±400V)
• BNC adapter for standard oscilloscope probes

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Limitations to Consider

The DSO153 serves hobby and educational purposes rather than professional measurement requirements. The single channel limits comparison between multiple signals simultaneously.

The 1MHz bandwidth suits audio and low-frequency digital work. Faster signals like high-speed SPI, USB data lines or RF circuits exceed this specification. For those applications, consider higher bandwidth equipment.

Sample rate of 5MS/s provides roughly 5 samples per cycle at maximum bandwidth. This shows signal shape but may miss fast transients or high-frequency noise.

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UK Service

Orders dispatch within 1-2 business days via Royal Mail. Most UK addresses receive delivery in 24-48 hours rather than weeks from overseas suppliers.

All purchases include 30-day returns under UK Distance Selling Regulations. Full refunds process within 14 days of return receipt. UK-based customer service responds within 1 business day.

Technical support helps match the DSO153 to your actual applications before purchase. Contact us if unsure whether 1MHz bandwidth and 5MS/s sampling suit your measurement needs.

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Technical Specifications

Oscilloscope Section

Channels	1
Bandwidth	1MHz
Sampling Rate	5MS/s
Vertical Sensitivity	10mV/div to 20V/div
Time Base Range	500ns/div to 20s/div
Voltage Range (1X)	±40V (80Vpp)
Voltage Range (10X)	±400V (800Vpp)
Trigger Modes	Auto, Normal, Single
Coupling	AC/DC

Signal Generator Section

Frequency Range	0-10kHz
Amplitude Range	0.1-3.3V
Duty Cycle	0-100%
Waveform Types	14

General

Display	2.8″ TFT LCD
Resolution	320×240 pixels
Battery	1000mAh lithium-ion
Battery Life	Approximately 4 hours
Charging	USB Type-C, 5V/1A
Weight	Approximately 100g
Dimensions	99×68×19mm
Languages	English, Chinese, Japanese, Korean, German, Spanish, Portuguese, Russian