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FNIRSI SG-003A Signal Generator
Product Manual
Introduction
This manual provides comprehensive instructions for the FNIRSI SG-003A signal generator, a versatile device capable of active current output, passive current output, voltage output, and PWM signal generation. It features a user-friendly interface with various settings for precise control and measurement.
The device itself is compact, measuring 92mm x 72mm x 30mm, and is powered by a 3000mA large-capacity lithium battery, rechargeable via a Type-C interface (5V). It supports operation in Chinese, Traditional Chinese, and English.
The front panel of the FNIRSI SG-003A features a display screen and a control panel. The control panel includes: SET/ALT button, ESC/OUT button, A/M button, ON/OFF button, FN button, PWM/SINGLE button, and directional arrow buttons (Up, Down, Left, Right) with a central CONVERT/RESET button.
1. Product Parameters
Signal
Range
Precision
Resolution
Max load
External power supply
Active current output
0~24mA
± (0.1%+0.005)
0.01mA
750Ω
Passive current output
0~24mA
± (0.1%+0.005)
0.01mA
0~30V
Voltage output
0~15V
± (0.1%+0.005)
0.01V
24V circuit
0~24mA
± (0.1%+0.005)
0.01mA
PWM output (frequency)
0~20K, 45K, 90K, 180K
±2%
1Hz
PWM output (duty cycle)
0~100
±2%
1%
Current input
0~24mA
± (0.1%+0.005)
0.01mA
Voltage input
0~30V
± (0.1%+0.005)
0.01V
Key Features:
Automatic Output Function: Voltage and current outputs feature automatic functions, allowing selection of single rise, single drop, and three circulation modes.
Input to Output Conversion: Supports voltage conversion to active current mode, passive mode, and current conversion to voltage mode.
Custom Output Function: Upper and lower output limits can be set arbitrarily.
Multilingual Support: Chinese, Traditional Chinese, and English languages can be switched freely.
Input Diagrams: Voltage input diagram and current input diagram with a frame rate of 10 frames.
Power Source: Powered by a large-capacity lithium battery, charged via a Type-C interface (5V).
Operating Environment: 0℃~50℃.
Dimensions: 92mm x 72mm x 30mm.
2. Powered By
The device is powered by a 3000mA large-capacity lithium battery. A battery indicator on the screen visually represents the charge level, showing a full battery as a completely filled bar and a low battery (less than 20%) as a partially filled bar with a warning.
Charging is done via a Type-C USB interface. An indicator light turns on when charging and goes out once the battery is fully charged. The device can be switched on/off using a toggle switch.
The charging port is labeled 'USB' and the power switch has 'OFF' (关) and 'ON' (开) positions, with a 'CHG' (充电) indicator.
3. Wiring Port
The device features four main wiring ports:
IN: Input positive level (cannot be reversed).
PWM: PWM output terminal (when PWM is not turned on, it is directly connected to OUT or IN, depending on relay selection).
OUT: Positive output.
COM: Input, output, negative GND of PWM.
The ports are arranged linearly on the device: IN, PWM, OUT, COM.
4. Wiring Diagram
The manual illustrates several common wiring configurations:
① Active current output: voltage output
Connects the device's COM, OUT, PWM, IN terminals to a Meter or PLC. The output is a voltage signal derived from active current output.
② No source output
Connects the device's COM, OUT, PWM, IN terminals to a digital display, PLC, isolation safety grid, or other equipment. This setup provides a passive output (XMT) from a 24V source.
③ 24V loop
Connects the device's COM, OUT, PWM, IN terminals to a Transmitter. This forms a 24V loop circuit.
④ Output: self-supplied
Connects the device's COM, OUT, PWM, IN terminals to a Meter or PLC, with the device providing its own power for the output.
⑤ PWM external supply
Connects the device's COM, OUT, PWM, IN terminals to a Meter or PLC and an External power supply, indicating an external power source for PWM operation.
⑥ Current input; Voltage input
Connects the device's COM, OUT, PWM, IN terminals to a Sensor for current or voltage input measurements.
The device's side view shows the IN, PWM, OUT, and COM ports with their respective functions: COM (Input, output, negative GND of PWM), OUT (output positive), PWM (PWM output terminal), IN (Input positive).
5. Manual Interface
The main interface displays IN Vol, IN mA, and Vol OFF readings. It allows programmable output of 0-15V voltage and 0-24mA current.
5.1 Interface Description
When the FNIRSI SG-003A is not set, there are four main interfaces: manual interface, PWM interface, VC conversion interface, automatic interface, and input waveform interface.
5.2 Button Operation in Non-Setting State
ON/OFF key: Controls the output switch.
FN key: Switches the FN key color.
When the FN key is red, pressing the SET key enters the setting interface.
5.3 Manual Interface Button Operation (when the FN button is white)
ALT key: Switches between input current graph display, input voltage graph display, and combined input voltage and current display.
The input waveform interface shows switchable input current graph display and input voltage graph display.
Note: To measure input voltage, the device must be switched to this interface. Refer to the notes section for details.
OUT button: Switches between active current output, passive current output, voltage output, and 24V loop output.
Up, down, left, and right keys: For 24V loop output, the other three outputs can be set using these four buttons. The up and down keys support long press for faster adjustment.
Preset settings can be switched between active 20mA setting, passive 20mA setting, and 0-15V setting using the ALT key, FN key, or up and down keys. Press the right key to enter the setting item. Press the ESC key or the left key to return to the system settings.
5.8 Description of Preset Setting Parameters
Upper preset manual interface: The preset value of the upper key (when the FN key is red).
Lower preset manual interface: Preset value by the next key (when the FN key is red).
Left preset: Manual interface, left-click preset value (when the FN key is red).
Right preset manual interface: Right preset value (when the FN key is red).
6. Automatic Interface
The automatic interface allows setting for single ascent, single drop, and loop modes. The screen displays IN Vol, IN mA, Vol OFF, and Cycle T values, along with AUTO, OFF, and Shift indicators.
6.1 Automatic Interface Button Operation
OUT key: Switches active current output, passive current output, and voltage output.
Up button: Turns on the output (cycles once).
Down button: Resets automatic output.
Right click: Pauses output.
6.2 Auto Set (Automatic Setting)
Automatic settings can be accessed via the ALT key, FN key, or by switching between up and down keys to select active 20mA setting, passive 20mA setting, or 0-15V setting. Press the right key to enter the setting item. Press the ESC key or the left key to return to the system settings.
6.3 Automatic Setting Parameter Description
Auto. Mode: Can be set to single ascending (UP), single descending (DO), and Cycle.
Cycles (Cycle T): 0 for unlimited times, 9999 is the maximum number.
Initial value (Initial): Value at the beginning of each cycle mode.
Incremental value (INC. Value): The value to be increased each time.
Decrement value (DEC. Value): The value to be decreased each time.
Increment time (INE. Time): The time between each increment.
Decrement time (DEC. Time): The time between each decrement.
Starting point delay (S.Delay): The delay time at the initial value.
End delay: Delay time at the end value.
End value (E. Value): The value at which the loop mode ends each time.
6.4 Supplement to the Description of Automatic Setting Parameters
6.4.1 Single ascending (UP)
The initial value is compared with the end value; the relatively small one is the starting value, and the relatively large one is the end value. The hold will not automatically close when the ascent mode reaches the end value.
6.4.2 Single descending (DO)
In descending mode, the initial value is compared with the end value; the relatively small one is the starting value, and the relatively large one is the end value. When the falling mode reaches the end value, the hold will not automatically close.
7. VC Conversion Interface
The VC conversion interface allows switching voltage to active current, voltage to passive current, and current to voltage. The screen displays IN Vol, IN mA, Act OFF, and VCA CON readings, along with OFF and Shift indicators.
7.1 VC Interface Button Operation
OUT key: Switches voltage conversion to active current. Voltage is converted to passive current. Current is converted to voltage.
7.2 Signal Conversion Setting Parameter Description
VC Con.: Opens or closes VC conversion.
Con. Mode: Selects voltage conversion active current mode, passive current mode, and current conversion voltage mode.
V ULlimit: The lowest value of the output voltage after conversion.
V DLlimit: The highest value of the output voltage after conversion.
mA ULimt: The lowest value of current output after conversion.
mA Dlimit: The highest value of current output after conversion.
Over ran (range): Opens or closes control if the input is higher than 100% or whether the output is higher than 100%.
7.3 Signal Conversion Setting Parameter Description Supplement
Output voltage = input current / (current upper limit - current lower limit) * (voltage upper limit - voltage lower limit) + voltage lower limit
Output current = input voltage / (upper limit of voltage - lower limit of voltage) * (upper limit of current - lower limit of current) + lower limit of current
Even if the overrange is turned on, the input and output cannot exceed the maximum range of the instrument.
8. PWM Interface
The PWM interface allows setting the output PWM signal, voltage, frequency, and duty cycle. The screen displays IN Vol, OUT Vol, Duty, and Freq readings, along with PWM, OFF, and Shift indicators.
8.1 Button Operation on the PWM Interface (when the FN button is white)
OUT key: The frequency can be set to 45KHz, 90KHz, 180KHz.
Up, down, left, and right keys: Set the value of the voltage output. The up and down keys support long press.
8.2 PWM Interface Button Operation (when the FN button is red)
OUT key: Controls the relay and switches the PWM amplitude (PWM will affect output or input).
Up, down, left, and right keys: Set the duty cycle and frequency values. The up and down keys support long press.
8.3 PWM Frequency Accuracy Description
The PWM is generated by the internal hardware of the microcontroller. Its accuracy is affected by 72MHz/100. It is also affected by the MOS tube. For optimal accuracy, the set frequency should be divisible by 720,000. If it is not divisible, the accuracy deviation will be greater.
9. Key Operation of System Settings
To enter the system settings, press the FN key to switch its color. When the FN key is red, press the SET key.
The system settings interface displays options such as Outo Set, Sig. Cnv., Custom Set, Other Set, and Presetting.
9.1 Key Operation Instructions of the System Setting Interface
ALT key: Moves up.
ESC key: Exits system settings.
FN key: Moves down.
Confirm & enter key (central button): Confirms and enters.
9.2 In the System Settings Interface, Key Operation Instructions for Entering the Next Level of Settings
ALT key: Moves up.
FN key: Moves down.
ESC key: Exits the current interface and enters the confirm modification interface.
Up and down keys: Set the value of the parameter.
Left and right keys: Switch parameter counting unit (move left and right).
9.3 Confirm to Modify the Interface Button Operation Instructions
ALT key, ESC key/up and down keys: Move up and down.
Restore factory settings (Factory Reset): Formats all stored data.
Voltage map height: Every 0.01V of the voltage map height corresponds to a certain number of pixels on the Y-axis (e.g., 4.00mA with a graph high of 0.05 corresponds to 20 pixels on the Y-axis).
Current map height: Every 0.01mA of current map height corresponds to a certain number of pixels.
Battery voltage (Electric): The battery power directly reads the battery voltage. Battery voltage =
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