FNIRSI Function Generator Model SG-004A; Multi-Function Calibrator 0–24mA/0–24V with Frequency Output up to 10kHz for PLC and DCS
For engineers who need a truly versatile tool
If you find yourself switching between multiple devices every time you debug a PLC, simulate a DCS, adjust valve positioners, or test inverters, the SG-004A shines exactly where ordinary tools fall short. This multi-function signal generator/calibrator from FNIRSI offers 0–24mA current, 0–24V voltage, frequency up to 10kHz, and mV input/output (for thermocouple simulation) in a compact, battery-powered body; along with real-time curve display, input-to-output signal conversion, and history logging—everything needed for fieldwork and quick commissioning.
Why is SG-004A the first choice for fieldwork and commissioning?
Multiple vital signals in one device: current source, voltage source, frequency/pulse, and mV for thermocouples—instead of carrying several separate calibrators.
Industrial-level current sourcing and voltage output: 0–24mA and 0–24V to cover standard 4–20mA and 0–10V inputs/outputs of PLC/DCS and drives.
Frequency up to 10kHz: suitable for testing high-speed pulse/counter inputs of PLCs and simulating common frequency signals.
Accuracy and resolution suitable for instrumentation: 0.001mA and 0.001V resolution; industrial class accuracy (about 0.2% depending on mode).
Live display and data logging: view signal curves in real time and review history for evidence-based troubleshooting.
3000mAh battery with Type-C charging: about 10 hours of operational and standby time; perfectly suited for field projects.
2.4-inch color display: high readability in industrial environments with varying light.
Pocket-sized dimensions: 112×77×21 mm and only 167 grams—always with you, hassle-free.
Deeper engineering; what makes a practical difference
0–24mA current source with precise control: simulates 4–20mA for calibrating PLC analog inputs, testing valve positioners, and checking current loop behavior. 0.001mA resolution lets you finely adjust slopes and measure hysteresis.
0–24V voltage source with 1mV steps: calibrates 0–5V and 0–10V inputs/outputs on analog cards, drives (VFD/inverter), and controllers.
Frequency output up to 10kHz: stimulates high-speed digital inputs (HSC/Counter), simulates speed sensors, or tests pulse counting paths in PLCs.
mV input/output for thermocouples: simulates thermocouple mV and receives signals for testing and matching temperature channels. Ideal for calibrating measurement chains without a heat source.
Input-to-output signal conversion: map one input simultaneously to a desired output signal (e.g., converting 4–20mA to 0–10V) and instantly see loop response—ideal for testing transmitters and I/O cards.
Auto Lift output program: generates controlled ramps (stepwise or continuous) for process testing—examining valve start points, dead zones, response speed, and stability.
Real-time curve and history: see system behavior live and keep history for later analysis—data-driven troubleshooting instead of guesswork.
MODBUS communication support: for integration in industrial control environments and digital workflows.
Practical scenarios that shorten project delivery time
PLC debugging and I/O commissioning: inject 4–20mA to AI input, 0–10V to AO, and pulses up to 10kHz to high-speed DI—align control software with field reality before process startup.
DCS simulation during commissioning: test instrumentation loops, map signals, and check alarms/interlocks with programmed ramps.
Valve positioner adjustment: 4–20mA current ramp to check hysteresis, repeatability, and zero/span points; observe response on real-time curve.
Instrument testing and calibration: check and adjust pressure/temperature/flow transmitters with stable reference signals—no bulky lab equipment needed.
Inverter (VFD) testing: verify 0–10V/4–20mA analog inputs and frequency inputs; simulate speed commands and observe drive behavior.
Key technical specifications table
Feature
Value
Description
Current mode
0 to 24 mA
0.001 mA resolution; suitable for 4–20 mA simulation
Voltage mode
0 to 24 V
0.001 V resolution; covers 0–5V and 0–10V
Frequency/Pulse mode
Up to 9,999 Hz (≈10 kHz)
Suitable for HSC/Counter in PLC
mV input/output (thermocouple)
Yes
Simulates/measures mV for temperature channels
Measurement/generation accuracy
About 0.2% (depending on mode)
Industrial class, suitable for field calibration
Display
2.4-inch color TFT
High readability with backlight
Data logging
History + real-time graph
Monitors behavior and documents tests
Features
I/O conversion, auto ramp
Signal mapping and dynamic loop testing
Battery
3000 mAh lithium
About 10 hours operation; Type-C charging
Dimensions/Weight
112×77×21 mm / 167 g
Easy to carry, suitable for fieldwork
Why this model stands out from ordinary tools?
Signal integration: current, voltage, frequency, and mV in one device—faster setup and fewer wiring errors.
Data-driven troubleshooting: real-time curve and history display, beyond simple numeric readouts.
Field efficiency: high-capacity battery, Type-C charging, pocket size, and clear color display.
Ready for industrial control: input-to-output conversion, pre-programmed ramps, and MODBUS support for seamless integration.
Frequently Asked Questions
Can the SG-004A fully simulate 4–20mA loops?
Yes; it can generate 0–24mA current with 0.001mA resolution and is ideal for simulating 4–20mA on PLC/DCS analog inputs and current-driven actuators. For powering two-wire transmitters, ensure a suitable power supply is present in the loop.
Is the frequency output suitable for high-speed PLC inputs?
Yes; output up to about 10kHz is suitable for testing counters/HSCs, and you can simulate pulse inputs without real sensors.
Is history logging and review available?
Yes; SG-004A saves test history alongside real-time curve display so you can review system behavior later.
What is the battery capacity and charging method?
3000mAh battery with USB Type-C charging; designed for long field use and lasts about 10 hours under normal use.
How does it help with temperature calibration?
With mV input/output, you can simulate or test thermocouple-based channels; ideal for quick matching and calibration of temperature measurement paths.
In summary, if you want a compact, precise, and field-oriented tool that simultaneously covers current, voltage, frequency, and mV signals and elevates troubleshooting with curves and history, the FNIRSI Function Generator Model SG-004A is a choice that quickly proves itself in any project.
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