FNIRSI® ±12V/0-24mA Voltage and Current Source Signal Generator
Product Description
The FNIRSI® ±12V / 0~24mA Voltage and Current Source Signal Generator is a compact adjustable signal source designed for testing, calibration, and troubleshooting industrial control systems and electronic equipment. It provides adjustable DC voltage output from -12V to +12V and current output from 0 to 24mA, making it suitable for testing analog input channels, PLCs, inverters, controllers, and other industrial automation equipment.
The device features a four-digit digital display with two decimal places, allowing users to monitor the selected output value. A rotary encoder provides convenient adjustment, while the MODE button allows quick switching between voltage and current output modes.
The voltage output supports multiple configurable ranges, including ±12V, ±5V, 0–10V, 2–10V, 0–5V, 1–5V, 0–3.3V, 0–2.5V, 0–1V, and -10–0V. The current output supports 0–20mA, 4–20mA, and 0–24mA modes.
The generator also provides adjustable coarse and fine output control, output calibration settings, and programmable quick-output points. Users can save the current output value so that the device restores the saved value after the next startup.
For flexible operation, the unit supports three power supply methods: an external DC power supply, a USB 5V input, and an optional built-in rechargeable lithium battery. Its compact enclosure and terminal-based connections make it suitable for field testing and industrial maintenance work.
Key Features
- Dual Voltage and Current Output: Provides adjustable voltage and current signals for testing industrial equipment.
- Adjustable Voltage Output: Supports output adjustment from -12V to +12V.
- Adjustable Current Output: Supports output adjustment from 0 to 24mA.
- Multiple Voltage Ranges: Configurable output modes include ±12V, ±5V, 0–10V, 2–10V, 0–5V, 1–5V, 0–3.3V, 0–2.5V, 0–1V, and -10–0V.
- Multiple Current Ranges: Supports 0–20mA, 4–20mA, and 0–24mA output modes.
- Four-Digit Digital Display: Displays output values with two decimal places.
- Rotary Encoder Control: Allows convenient adjustment of voltage and current output values.
- One-Button Mode Switching: Switches between voltage and current adjustment modes using the MODE button.
- Coarse and Fine Adjustment: Provides selectable adjustment modes for faster or more precise output setting.
- Output Calibration: Supports calibration settings at multiple reference points for voltage and current output.
- Quick Output Function: Supports programmable output points for convenient switching between predefined values.
- Output Value Memory: Saves the selected output value for restoration after the next startup.
- Multiple Power Supply Options: Supports external DC power, USB 5V power, and an optional internal rechargeable battery.
- Active and Passive Current Wiring: Supports different current-loop connection configurations, as illustrated in the wiring diagrams in the manual.
- Compact Design: Suitable for industrial maintenance, equipment commissioning, and field testing.
Technical Specifications
General Specifications
| Parameter | Specification |
|---|---|
| Product Type | Voltage and Current Source Signal Generator |
| Voltage Output Range | ±12V |
| Current Output Range | 0–24mA |
| Display | 4-Digit Digital Display |
| Display Resolution Format | Two Decimal Places |
| Adjustment Control | Rotary Encoder |
| Mode Selection | MODE Button |
| Dimensions | Approximately 70 × 90 × 27mm |
| Encoder Resolution | 30 Pulses per Revolution |
Voltage Output Specifications
| Parameter | Specification |
|---|---|
| Adjustable Output Range | -12V to +12V |
| Accuracy After Calibration | 0.05V |
| Maximum Output Current | 20mA |
| Available Output Modes | ±12V, ±5V, 0–10V, 2–10V, 0–5V, 1–5V, 0–3.3V, 0–2.5V, 0–1V, -10–0V |
| Coarse Adjustment | Adjustable |
| Fine Adjustment | Adjustable |
| Calibration Reference Points | -10V, 0V, +10V |
Current Output Specifications
| Parameter | Specification |
|---|---|
| Adjustable Output Range | 0–24mA |
| Accuracy After Calibration | 0.05mA |
| Maximum Sampling Resistance | 500Ω |
| Available Output Modes | 0–20mA, 4–20mA, 0–24mA |
| Coarse Adjustment | Adjustable |
| Fine Adjustment | Adjustable |
| Calibration Reference Points | 4mA, 12mA, 20mA |
Power Supply Specifications
| Parameter | Specification |
|---|---|
| External DC Power Supply | 15–30V DC |
| External DC Power Consumption | 1W (not charging) / 4W (charging) |
| USB Input | Micro-USB 5V |
| USB Current Consumption | 0.2A (not charging) / 0.8A (charging) |
| Internal Battery | 3.7V Lithium Battery |
| Battery Capacity | 1100mAh (optional) |
| Maximum Battery Charging Current | 0.6A |
Additional Configuration Settings
| Parameter | Description |
|---|---|
| Coarse/Fine Adjustment | Selectable |
| Output Display | Actual value or percentage, depending on mode |
| Digital Display Brightness | 8 levels |
| Quick Output Points | 2–9 programmable points |
| Output Value Storage | Supported |
| Automatic Exit from Settings | After 10 seconds without operation |
Applications
- PLC Analog Input Testing: Generate adjustable voltage and current signals for checking PLC analog input channels.
- Industrial Automation: Test analog signal inputs in industrial controllers and automation systems.
- Inverter and Servo System Testing: Provide adjustable signals for checking compatible inverter and servo control interfaces.
- 4–20mA Current Loop Testing: Generate current signals for testing industrial transmitters, controllers, and analog input circuits.
- 0–10V Signal Testing: Test voltage-based analog control inputs and signal-processing circuits.
- Instrumentation Calibration: Provide adjustable reference signals for checking and calibrating compatible industrial instruments.
- Control System Troubleshooting: Help identify signal-related problems in industrial equipment and control circuits.
- Equipment Commissioning: Test analog input channels during installation, setup, and maintenance.
Frequently Asked Questions (FAQ)
1. What output signals does the FNIRSI Voltage and Current Source Signal Generator provide?
It provides adjustable DC voltage output from -12V to +12V and current output from 0 to 24mA. It can be used to generate signals for testing compatible industrial control equipment.
2. Does the device support standard 4–20mA current signals?
Yes. The current output can be configured to 0–20mA, 4–20mA, or 0–24mA, making it suitable for testing compatible 4–20mA industrial current-loop systems.
3. What voltage output ranges are supported?
The available voltage modes include ±12V, ±5V, 0–10V, 2–10V, 0–5V, 1–5V, 0–3.3V, 0–2.5V, 0–1V, and -10–0V.
4. Can I adjust the output signal precisely?
Yes. The device provides coarse and fine adjustment modes through its rotary encoder. The specified accuracy after calibration is 0.05V for voltage output and 0.05mA for current output.
5. Can the generator be used to test PLC analog input channels?
Yes. It can generate adjustable voltage and current signals for testing compatible PLC analog input channels. The wiring configuration must match the PLC input type and the manufacturer's connection diagram.
6. What is the difference between active and passive current-loop connections?
Active and passive connections refer to different current-loop wiring arrangements. The manual provides wiring diagrams for active and passive current connections, including 2-, 3-, and 4-wire configurations. Always check the PLC or controller input wiring requirements before connecting the generator.
7. How can I power the signal generator?
The device supports three power supply methods: an external 15–30V DC power supply, a 5V Micro-USB input, or an optional internal 3.7V 1100mAh rechargeable lithium battery.
8. Does the device remember the last output value?
Yes. A short press of the encoder confirmation button saves the current output value. After the next startup, the device restores the saved value. This is useful when repeatedly testing equipment at the same signal level.
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