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In my lab I have a FNIRSI SG002 Signal Generator.

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If you want to buy, see here:

Vendor Product
AliExpress Digital 4-20mA 0-10V Voltage Signal Generator 0-20mA Current Transmitter Professional Electronic Measuring Instruments


I keep my documentation for this equipment here:

  • /home/jj5/electronics/equipment/signal-generator-FNIRSI-SG-002/


Purchased from here: SG002 Digital Voltage Signal Generator 0-10V 0-22mA Current Transmitter Adjustable Professional Electronic Measuring Instrument Signal generator (voltage and current generator).


Details are here: http://fnirsi.cn/productinfo/3992.html


FNIRSI SG-002 Signal Generator Product Manual:

FNIRSI SG-003A Signal Generator Product Manual:

FNIRSI SG-004A Signal Generator Product Manual:

Digital 4-20mA 0-10V Voltage Signal Generator 0-20mA Current Transmitter Professional Electronic Measuring Instruments

This handheld small voltage and current signal generator can be used in scientific research, laboratories, company factories, electrical maintenance, etc. Come and try.


The voltage and current signal generator is the most commonly used electrical test instrument for electrical engineers and technicians during onsite installation, commissioning, overhaul and maintenance of electrical equipment.

Pluggable terminal blocks, safe and convenient wiring.

4-digit high-definition digital tube, the display brightness is evenly adjustable (1-8 brightness).

Aluminum knob cap, electroplating button, high-quality film, charging indicator, battery switch.

Three power supply methods: external power supply, DC5V micro USB, built-in lithium battery (only when type 1 is selected, the built-in lithium battery charging mode can be used). As long as you work all the way, you can also connect at the same time.

DC 15-30V external power supply, which can share the 24V power supply of PLC and other equipment.

MicroUSB universal interface, can be connected to mobile power, charger, computer USB port, etc.

On the normal operation screen, save a voltage and current value, click the encoder to save, and after releasing the "OK" button, the screen displays "...", indicating that the save is successful. After restarting, the saved value will be displayed directly, and there is no need to adjust the parameters every time when starting up, which is very practical.

Easy to carry and small in size, it is the best choice for on-site debugging.


Material: ABS

Colour: black

Voltage output: ±12V

Current output: 0-24mA

Type: 1-2 (optional)

Charging method: built-in lithium battery (only type 1), external power supply, DC5V micro USB

Battery: 1*Lithium battery, 3.7V, 1100mAh (only type 1 included)

Size: about 89*69*28mm/3.5*2.7*1.1in

Packing size: about 90*70*38mm/3.5*2.8*1.5in


Type 1: about 95g/3.4oz

Type 2: about 115g/4.1oz

Packing List: (optional)

Type 1:

1 * Voltage and Current Generator (not including battery)


Type 2:

1 * Voltage and Current Generator (including battery

FNIRSI SG-003A 0-10V Adjustable Current Voltage Simulator 4-20mA Signal Generator Sources transmitter calibrator Transmitte


FNIRSI SG-003A signal generator is mainly used for debugging of industrial field PLC, process instrumentation, electric valve and so forth. Friendly operation interface is easy to use.

The FNIRSI SG-003A signal generator is small and light but has a long standby time and high precision.Easy to carry when you go out to work.

Adjustable button backlight and high-definition TFT color LCD screen make it more convenient for users to operate at night and during the day


1. Expect with the conventional signal input and output functions

2. Voltage and current have automatic output function,it can choose a single rise,three modes of single drop and cycle.

3. With input to output conversion,voltage conversion active current mode,passive mode and current conversion voltage mode.

4. The output has a custom function,the upper and lower output limits can be set arbitrarily.

6. Voltage input diagram,current input diagram,the frame rate is 10 frames.

7. PWM output can set frequency and duty cycle respectively.

8. Real-time curve:Real-time observation of changes in voltage and current

9. It is powered by a large-capacity lithium battery and is charged with a Type-c interface (5V).The capacity of the lithium battery is 3000mHA,Super long working hours

10. The high-definition TFT color LCD screen makes the reading more eye-catching.The resolution is 240*320.Low power consumption,Maximum power consumption: 0.32W

Technical Parameters

1. Active current output: range: 0~24mA; resolution: 0.01 mA; maximum load: 750Ω;Precision:±(0.1%+0.005)

2. Passive current output: range: 0-24 mA; resolution: 0.01 mA; external power supply up to 30V;Precision:±(0.1%+0.005)

3. Voltage output: range: 0-24 V; resolution: 0.01v; maximum current 30mA;Precision:±(0.1%+0.005)

4. 24V voltage output: drive current: 24mA;resolution: 0.01 mA;Precision:±(0.1%+0.005)

5. Current input measurement: range: 0-24 mA; resolution: 0.01 mA; input impedance:100Ω;Precision:±(0.1%+0.05)

6. Voltage input measurement: range: 0-30 V; resolution: 0.01 V; input impedance: 2MΩ;Precision:±(0.1%+0.05)

7. PWM output (frequency):Range: 0-9999Hz

8. A sngle 3.7V 3000mAh lithium battery power supply; Standby time is 26 hours;the using time varies, based on the usage(It can be 8-10 hours with 20mA continuous output)

9. Operating environment: 0 °C - 50 °C.

10. Internal reverse and overcurrent protection; protection voltage:30V

11. Output automatically

12. Size: 92mm*72mm*30mm

13. Weight:165g

Package includes

1x FNIRSI SG-003A Multifunctional Signal Generator Calibrator

4x Test Clip

1x Type-C Charging Cable

1x EU Charger


  • Model Number: SG-002
  • Display Size: 2.9 Inches & Under
  • DIY Supplies: ELECTRICAL
  • Brand Name: FNIRSI
  • Origin: Mainland China
  • Certification: CE
  • Product Size: 9x7x3.8cm
  • Accuracy: 0.01mA, 0.01V
  • Output Range: 0-22mA, ±12V
  • Supplies: Electrical Display
  • Power Supply: Rechargeable battery, Micro USB 5V, 15-30 VDC via wiring terminals