The FNIRSI SG-004A is a compact signal generator that combines functionality with accuracy and speed. The device provides a measurement accuracy of ≤0.2% and an immediate reading of the results in just one second. With multi-function operation and an easy-to-read backlit screen, the SG-004A makes debugging and testing easy in a wide variety of environments, whether you're working with PLC systems, DCS systems or calibrating instruments.
The generator, equipped with a 2.4-inch HD display with adjustable brightness, makes the parameters clearly visible even in difficult lighting conditions. In addition, the different operating modes are color-coded with background lighting, which makes handling significantly easier. The semi-transparent buttons ensure comfortable use and a modern look.
The SG-004A weighs only 165 grams and measures 112 x 82 x 27 mm, making it easy to fit in a pocket or tool bag. Perfect for field engineers and technicians who need a reliable and mobile diagnostic tool close at hand.
The FNIRSI SG-004A generator supports many signal types and operating modes - from current and voltage input and output tests, to speed simulation and programming, to actuator position adjustment and inverter diagnostics. It's a multitasking tool ready for any challenge. In addition, with the real-time curve view, you can follow the changes of the input and output signals in real time. This facilitates the analysis and ensures that any abnormalities are detected more quickly.
The device is designed for intensive use. Equipped with drop protection technology, a USB-C charging port, non-slip parts made of silicone and an easy-to-read power level indicator, it guarantees maximum comfort during every use. The whole thing is completed by the standby mode, which provides up to 24 hours of standby time.

- Model SG-004A
- Dimensions 82 x 27 x 112 mm
- Weight 165 g
- Color Yellow, black
- Screen LCD
- Screen size 2.4"
- Interface Type-C
- Input 5V
- Battery capacity 3000 mAh
- Standby time 24 hours