FNIRSI SG-003A Signal Generator


Product Details

Basic Specifications:

- Active current output: 0~24mA; Resolution: 0.01 mA; Maximum Load: 750Ω; Precision: ±(0.1%+0.005)

- Passive current output: 0-24 mA; Resolution: 0.01 mA; External Power Supply up to 30V; Precision: ±(0.1%+0.005)

- Voltage output: 0-24 V; Resolution: 0.01v; Maximum Current: 30mA; Precision: ±(0.1%+0.005)

- 24V voltage output: Drive Current: 24mA; Resolution: 0.01 mA; Precision: ±(0.1%+0.005)

- Current input measurement: 0-24 mA; Resolution: 0.01 mA; Input Impedance:100Ω; Precision: ±(0.1%+0.05)

- Voltage input measurement: 0-30 V; Resolution: 0.01 V; Input Impedance: 2MΩ; Precision: ±(0.1%+0.05)

- PWM output (frequency): 0-9999Hz

- Battery: Single 3.7V 3000mAh lithium battery; Standby Time: 26 hours; Usage Time Varies (8-10 hours with 20mA continuous output)

- Operating Environment: 0°C - 50°C

- Internal Reverse and Overcurrent Protection; Protection Voltage: 30V

- Output Automatically


Introducing the SG-003A: a compact powerhouse tailored for industrial and measurement needs. With precise current and voltage outputs, high-resolution input measurement, and versatile PWM functionality, the SG-003A delivers unmatched flexibility and accuracy.

Equipped with active and passive current outputs, voltage output, and specialized 24V drive current output, this device ensures precise control and measurement capabilities. Its high-resolution output and input, along with robust protection features, guarantee reliable performance in diverse environments.

Powered by a long-lasting lithium battery, the SG-003A offers up to 26 hours of standby time and 8-10 hours of continuous usage. Compact and lightweight, it's designed for convenience without compromising on performance.

Experience versatility, precision, and reliability with the SG-003A, your trusted companion for industrial and measurement tasks.

Display and Technology:

- High-definition TFT color LCD screen

- Adjustable button backlight

Functionality and Features:

- Supports physical and engineering precise conversion of signals

- Real-time curve display for input and output signals

- Signal conversion and output between different physical quantities

- Multiple port signal generator with 4mm wiring ports

- Supports preset value programming output for quick adjustments

Connectivity and Power:

- Powered by a single 3.7V 3000mAh lithium battery

- Internal reverse and overcurrent protection with a protection voltage of 30V

- Output automatically according to set parameters

Package Size:

- 5.9 x 5.7 x 3.2 inches; 1.05 lbs

- 92 x 72 x 30mm; 165g

Package Contents:

- FNIRSI SG-003A Signal Generator x1

- Test Pen x4

- Charging Cable x1

- User Manual x1

- Packaging Box x1


Warning Tips:

1. Electrical Safety:Always ensure that the device is used in accordance with electrical safety standards to prevent electric shock or damage to the equipment.

2.High Voltage: Exercise caution when working with high voltage signals. Make sure to use appropriate safety measures and protective gear to avoid injury.

3. Proper Grounding: Ensure that the oscilloscope is properly grounded to prevent electrical hazards and ensure accurate measurements.

4. Overloading: Avoid applying signals that exceed the specified input voltage range to prevent damage to the device.

5. Heat Dissipation: Allow the device to dissipate heat effectively by ensuring proper ventilation around the device during operation.

6. Firmware Updates: When performing firmware updates, ensure that the process is carried out correctly to avoid any potential disruptions or errors in the operation of the device.

7. Battery Usage: Follow the manufacturer's instructions for charging and using the battery to prevent overheating, fire, or explosion hazards.

8. Storage and Transportation: Store and transport the device carefully to prevent physical damage or exposure to extreme environmental conditions.

9. User Manual: Always refer to the user manual for proper usage instructions, safety precautions, and troubleshooting guidelines.

10. Maintenance: Regularly inspect and maintain the device to ensure optimal performance and safety. If any abnormalities are detected, discontinue use and seek professional assistance.

Customer Reviews

Based on 35 reviews
Joesph Boyle


Gillian Zboncak

Excellent equipment, works perfect, has a very robust construction and a pretty beautiful design. Exceeded my expectations

Valerie Boehm

When I bought the device, the battery was dead. I removed the battery and charged it separately with the TP4056 module for up to 4 hours. after that it was fixed

Jon Stoltenberg

received as per the description and in proper packing.
Received package before the mentioned time.

Raquel Rath

Excellent equipment, allows several configurations. Very functional.



Please read our FAQs page to find out more.

Why can't the machine turn on after receiving it?

Please check whether the power cord is connected to the oscilloscope and whether the socket is providing power. If both are correct, please try replacing the mobile phone charging adapter and test it again. If the issue persists and the machine is still unable to start, please contact customer service for a replacement.

Why is there no waveform displayed during the test, with only one line remaining on the screen?

Please check whether the pause button has been pressed. If not, press the [Auto] button once. If the issue persists, it may indicate that the signal source has no signal output or there could be a problem with the probe line, such as a short circuit or an open circuit. Please use a multimeter to check whether the probe and signal source are functioning normally.

Why does the waveform run up and down when testing the signal, and why can't I see the waveform, only multiple online and offline beats?

Set the trigger mode to auto and then press the [auto] button once. If the issue persists, the probe's clamp may not be grounded or the probe's clamp end may be open circuit. Please check the probe's integrity with a multimeter.

Why would you measure a battery or other DC voltage without a waveform?

The battery voltage signal is a stable DC signal, devoid of a curved waveform. In DC-coupled mode, adjusting the vertical sensitivity results in an upward or downward offset straight line waveform. However, if AC coupling is employed, regardless of adjustment attempts, no waveform is observed.

Why is the peak value of Vpp more than 600 V, rather than 220 V or 310 V, when measuring the voltage waveform of the city power?

The city power's 220V is a symmetrical AC signal, with the positive peak voltage (maximum value) at +310V and the negative peak voltage (minimum value) at -310V. Therefore, the peak-to-peak value is 620V. The standard measurement parameter is the effective value, often denoted as the RMS value. At this standard, the voltage of 220V is referenced. However, the effective value of municipal voltage can fluctuate from 180V to 260V. Consequently, the peak Vpp falls within the range of 507V to 733V.

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