FNIRSI® S1 Large Screen Digital Display Smart Multimeter
Product Description
The FNIRSI® S1 Large Screen Digital Display Smart Multimeter is a compact rechargeable digital multimeter designed for electrical testing, electronics troubleshooting, and general measurement applications. It features a large dual-display LCD with up to 9,999 counts, automatic measurement mode, and a selection of commonly used electrical testing functions.
The S1 automatically identifies and measures AC/DC voltage, resistance, and continuity in AUTO mode, making routine measurements more convenient. Additional manual measurement functions include capacitance, frequency, temperature, and diode testing.
For electrical detection, the instrument also provides Non-Contact Voltage (NCV) sensing and LIVE wire detection. Its built-in flashlight helps illuminate working areas, while the Data Hold function keeps the current reading on the display for easier reference.
Powered by a rechargeable 3.7V lithium battery and equipped with a USB Type-C charging port, the FNIRSI S1 offers portable operation without relying on disposable batteries. Its compact design and large display make it suitable for electronics technicians, students, maintenance personnel, and DIY users.
Important: The FNIRSI S1 does not support electrical current measurement (AC or DC). It is designed for voltage, resistance, capacitance, frequency, temperature, continuity, and diode measurements.
Key Features
- Large Dual-Display LCD: Large digital display with up to 9,999 counts for clear measurement readings.
- Automatic Measurement Mode: Automatically measures AC/DC voltage, resistance, and continuity.
- Multiple Measurement Functions: Supports AC/DC voltage, resistance, capacitance, frequency, temperature, continuity, and diode testing.
- True RMS AC Voltage Measurement: Provides true RMS AC voltage measurement according to the manufacturer's specifications.
- NCV Detection: Non-contact voltage sensing with signal-strength indication and audible alerts.
- LIVE Wire Detection: Helps identify the live wire in electrical outlets.
- Intelligent Anti-Burning Feature: Listed by FNIRSI as a product highlight.
- Data Hold Function: Holds the displayed measurement reading for convenient reference.
- Built-In Flashlight: Provides illumination when working in low-light environments.
- Rechargeable Lithium Battery: Built-in 3.7V, 1000mAh rechargeable battery.
- USB Type-C Charging: Supports 5V/1A charging.
- Overload and Low-Battery Indication: Displays an overload warning (OL) and a low-battery indicator when applicable.
- Compact Design: Approximately 143 × 75 × 19mm and 130g including the battery.
Technical Specifications
General Specifications
| Parameter | Specification |
|---|---|
| Brand | FNIRSI |
| Model | S1 |
| Display | Large Dual-Display LCD |
| Maximum Display Count | 9,999 Counts |
| Measurement Mode | Automatic (AUTO) and Manual Function Selection |
| AC Voltage Measurement | True RMS |
| Power Supply | Rechargeable Lithium Battery |
| Battery Voltage | 3.7V |
| Battery Capacity | 1000mAh |
| Charging Interface | USB Type-C |
| Charging Input | 5V / 1A |
| Measurement Speed | Approximately 3 readings per second |
| Dimensions | 143 × 75 × 19mm |
| Weight | Approximately 130g (including battery) |
| Safety Rating | CAT III 1000V |
| Pollution Degree | 2 |
DC Voltage Measurement
| Range | Resolution | Accuracy |
|---|---|---|
| 0–10V | 0.001V | ±(0.8% + 3 digits) |
| 10–100V | 0.01V | ±(0.8% + 3 digits) |
| 100–1000V | 0.1V | ±(0.8% + 3 digits) |
| 1000V | 1V | ±(1.2% + 3 digits) |
- Maximum Input Voltage: 1000V DC
- Minimum Measurement Voltage: 0.75V DC
AC Voltage Measurement
| Range | Resolution | Accuracy |
|---|---|---|
| 0–10V | 0.001V | ±(0.8% + 3 digits) |
| 10–100V | 0.01V | ±(0.8% + 3 digits) |
| 100–1000V | 0.1V | ±(0.8% + 3 digits) |
| 1000V | 1V | ±(1.2% + 3 digits) |
- Maximum Input Voltage: 1000V AC
- Minimum Measurement Voltage: 0.75V AC
- Frequency Response: 50Hz–1kHz (True RMS)
Resistance Measurement
| Range | Resolution | Accuracy |
|---|---|---|
| 0–1000Ω | 0.1Ω | ±(0.8% + 3 digits) |
| 1k–100kΩ | 0.01kΩ | ±(0.8% + 3 digits) |
| 100k–1000kΩ | 0.1kΩ | ±(0.8% + 3 digits) |
| 1M–100MΩ | 0.01MΩ | ±(1.2% + 3 digits) |
- Maximum Resistance Range: 100MΩ
Continuity Test
| Parameter | Specification |
|---|---|
| Measurement Range | 100Ω |
| Resolution | 0.1Ω |
| Audible Buzzer | Yes |
| Buzzer Activation | Resistance below 50Ω |
| Open-Circuit Voltage | Approximately 0.4V |
Capacitance Measurement
| Range | Resolution |
|---|---|
| 0–10nF | 0.001nF |
| 10–100nF | 0.01nF |
| 100–1000nF | 0.1nF |
| 1–10μF | 0.001μF |
| 10–100μF | 0.01μF |
| 100–1000μF | 0.1μF |
| 1–10mF | 0.001mF |
- Accuracy: ±(4.5% + 5 digits)
Frequency Measurement
| Range | Resolution |
|---|---|
| 0–10Hz | 0.001Hz |
| 10–100Hz | 0.01Hz |
| 100–1000Hz | 0.1Hz |
| 1–10kHz | 0.001kHz |
| 10–100kHz | 0.01kHz |
| 100–1000kHz | 0.1kHz |
| 1–10MHz | 1kHz |
- Accuracy: ±(0.1% + 3 digits)
- Input Sensitivity: 1.5V RMS
Temperature Measurement
| Temperature Range | Resolution | Accuracy |
|---|---|---|
| -20°C to 0°C | 1°C | ±(5.0% + 4 digits) |
| 1°C to 400°C | 1°C | ±(1.0% + 3 digits) |
| 401°C to 1000°C | 1°C | ±(2.0% + 5 digits) |
| -4°F to 32°F | 1°F | ±(5.0% + 8 digits) |
| 33.8°F to 752°F | 1°F | ±(1.0% + 6 digits) |
| 753.8°F to 1832°F | 1°F | ±(2.0% + 10 digits) |
Diode Test
| Parameter | Specification |
|---|---|
| Resolution | 0.001V |
| Forward Test Current | Approximately 1mA |
| Open-Circuit Voltage | Approximately 3.2V |
| Display | Approximate Forward Voltage Drop |
Additional Functions
| Function | Description |
|---|---|
| NCV Detection | Non-contact AC voltage sensing |
| LIVE Detection | Live-wire identification |
| Data Hold | Holds the current reading |
| Flashlight | Built-in illumination |
| Overrange Indication | OL |
| Low-Battery Indication | Low-battery symbol |
| Automatic Measurement | AC/DC voltage, resistance, and continuity |
Applications
- Electronics Troubleshooting: Checking voltage, resistance, continuity, and component values in electronic circuits.
- Electrical Maintenance: Measuring AC/DC voltage and checking electrical connections.
- PCB Testing: Checking resistors, capacitors, diodes, and circuit continuity.
- Power Supply Testing: Measuring AC/DC output voltage in power supply circuits.
- Component Testing: Measuring capacitance and resistance for electronic components.
- Frequency Measurement: Measuring signal frequency in electronic and electrical circuits.
- Temperature Measurement: Checking temperatures using a compatible thermocouple.
- Electrical Wiring Inspection: Using NCV and LIVE detection functions to help identify electrical conductors.
- Educational Applications: Suitable for electronics students, laboratories, and technical training.
- DIY and Home Electrical Work: Supporting general electrical and electronic testing tasks.
Package Contents
- Main Device ×1
- Multimeter Probe ×1
- Data Cable ×1
- User Manual ×1
Frequently Asked Questions (FAQ)
1. What measurements can the FNIRSI S1 perform?
The FNIRSI S1 supports AC/DC voltage, resistance, capacitance, frequency, temperature, continuity, and diode testing. It also includes NCV and LIVE detection functions.
2. Can the FNIRSI S1 measure AC and DC current?
No. The FNIRSI S1 does not support AC or DC current measurement. It is designed for voltage and other electrical measurement functions, but it does not have an amperage measurement function.
3. Does the FNIRSI S1 have automatic measurement?
Yes. In AUTO mode, the meter automatically identifies and measures AC/DC voltage, resistance, and continuity. Other functions, such as capacitance, frequency, temperature, and diode testing, are selected using the SEL button.
4. What is the maximum voltage the FNIRSI S1 can measure?
The maximum specified input voltage is 1000V AC or 1000V DC. The instrument is rated CAT III 1000V. Always follow the safety instructions and use the correct measurement function and input connections.
5. Does the FNIRSI S1 support True RMS measurement?
Yes. The user manual specifies True RMS for AC voltage measurement, with a frequency response of 50Hz–1kHz.
6. Does the FNIRSI S1 support NCV and live-wire detection?
Yes. NCV detects AC voltage without direct electrical contact, while the LIVE function helps identify the live conductor using the red test probe.
7. Is the FNIRSI S1 rechargeable?
Yes. It has a built-in 3.7V, 1000mAh rechargeable lithium battery and charges through its USB Type-C port using a 5V/1A input.
8. Can the FNIRSI S1 measure temperature and capacitance?
Yes. It measures temperature from -20°C to 1000°C and capacitance from 0 to 10mF. Temperature measurement requires a compatible thermocouple, and the measurement leads must be connected according to the manual.
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