1. Introduction
The ANENG ST203 is a pocket-sized, 3 3/4-digit automatic digital instrument designed for stable performance, high precision, and reliability. It features a clear reading display and comprehensive overload protection, making it an ideal tool for electrical testing and measurement. This manual provides detailed instructions for the safe and effective use of your ST203 Digital Multimeter Clamp Meter.
2. Safety Information
Please read and understand all safety warnings and operating instructions before using this instrument. Failure to do so may result in injury or damage to the meter.
- When measuring voltage, do not input a voltage exceeding the effective value of DC 1000V or AC 750V. Exceeding these limits can damage the instrument and pose a safety risk.
- Voltages below 36V DC and 25V AC are generally considered safe. When measuring voltages higher than these values, always ensure that the test leads are in reliable contact, connected correctly, and well-insulated to prevent electric shock.
- Before changing functions or ranges, ensure the test leads are disconnected from the test point to avoid incorrect readings or potential hazards.
- Do not operate the meter if it appears damaged or if the test leads are damaged.
- Always use the correct terminals, function, and range for your measurements.
- Be cautious when working with voltages above 60V DC or 30V AC RMS, as they pose a shock hazard.
3. Product Overview
3.1. Components and Features
The ANENG ST203 is designed for ease of use and durability. Key components include the clamp jaw for current measurement, the LCD display, function buttons, and input terminals.
Figure 3.1: Front view of the ANENG ST203 Digital Multimeter Clamp Meter, highlighting its compact design and clear button layout.
Figure 3.2: The complete package contents, including the ANENG ST203 meter, test leads, instruction manual, and portable storage bag.
Figure 3.3: The clamp meter in action, demonstrating its automatic detection capability for single-line AC current measurement.
3.2. Display and Controls
The meter features a clear LCD display and intuitive controls for various measurement functions.
Figure 3.4: Close-up of the HD display, showing clear and bright readings even in environments requiring backlighting.
The display shows 4000 counts with automatic polarity indication. It features a backlight for improved visibility in low-light conditions. The meter also includes a flashlight for illuminating the test area.
Figure 3.5: The integrated anti-fall lanyard, providing convenient and secure handling to prevent accidental drops.
4. Setup
4.1. Battery Installation
The ANENG ST203 is powered by AAA 1.5V batteries (not included). To install or replace batteries:
- Ensure the meter is turned off and test leads are disconnected from any circuits.
- Locate the battery compartment cover on the back of the meter.
- Use a screwdriver to open the battery compartment.
- Insert the AAA 1.5V batteries, observing the correct polarity (+/-) as indicated inside the compartment.
- Replace the battery compartment cover and secure it with the screw.
5. Operating Instructions
The ANENG ST203 offers various measurement functions. Always ensure the correct function is selected and test leads are properly connected before taking a measurement.
5.1. DC Voltage (DCV) Measurement
- Turn the rotary switch to the DCV position.
- Connect the red test lead to the VΩHz terminal and the black test lead to the COM terminal.
- Connect the test leads across the circuit or component to be measured.
- Read the voltage value on the LCD display.
5.2. AC Voltage (ACV) Measurement
- Turn the rotary switch to the ACV position.
- Connect the red test lead to the VΩHz terminal and the black test lead to the COM terminal.
- Connect the test leads across the AC circuit or component.
- Read the voltage value on the LCD display.
5.3. AC Current (ACA) Measurement (Clamp Function)
- Turn the rotary switch to the ACA position.
- Open the clamp jaw by pressing the trigger.
- Enclose only one conductor of the circuit with the clamp jaw. Do not clamp multiple conductors, as this will result in an inaccurate reading.
- Close the clamp jaw securely.
- Read the current value on the LCD display.
5.4. Resistance Measurement / On-Off Test
- Turn the rotary switch to the Ω position.
- Connect the red test lead to the VΩHz terminal and the black test lead to the COM terminal.
- For resistance, connect the test leads across the component. For on-off test (continuity), connect the leads across the circuit.
- Read the resistance value or listen for the continuity buzzer.
5.5. Frequency (Hz) Measurement
- Turn the rotary switch to the Hz position.
- Connect the red test lead to the VΩHz terminal and the black test lead to the COM terminal.
- Connect the test leads across the circuit where frequency is to be measured.
- Read the frequency value on the LCD display.
5.6. Non-Contact Voltage (NCV) Test
- Press the NCV button.
- Move the top part of the meter (NCV sensor) close to the conductor or power outlet.
- The meter will beep and/or flash its indicator light if AC voltage is detected.
5.7. Zero Line / Fire Line Test
This function helps identify live (fire) and neutral (zero) wires. Refer to the specific instructions in the meter's display or manual for detailed usage of this feature.
6. Maintenance
6.1. Cleaning
To clean the meter, wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. Ensure the meter is completely dry before use.
6.2. Storage
When not in use for extended periods, remove the batteries to prevent leakage. Store the meter in a cool, dry place, away from direct sunlight and extreme temperatures.
7. Troubleshooting
If you encounter issues with your ANENG ST203, refer to the table below for common problems and solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Meter does not power on | Dead or incorrectly installed batteries | Check battery polarity; replace batteries. |
| No reading or unstable reading | Incorrect function selected; poor test lead connection; open circuit | Select correct function; ensure leads are firmly connected; check circuit for breaks. |
| "OL" displayed | Overload (measurement exceeds range) | Select a higher range if available, or ensure the measured value is within the meter's capabilities. |
| Inaccurate AC current reading | Multiple conductors clamped; external magnetic fields | Ensure only one conductor is clamped; move away from strong magnetic fields. |
8. Specifications
Detailed technical specifications for the ANENG ST203 Digital Multimeter Clamp Meter.
Figure 8.1: Summary of key product specifications including brand, model, color, battery, accessories, and size.
| Parameter | Value |
|---|---|
| Display | Liquid Crystal Display (LCD), 4000 counts |
| Measurement Method | Double integral A/D conversion |
| Sampling Rate | Approximately 3 times per second |
| Over Range Display | "OL" |
| Low Voltage Display | Battery symbol appears |
| Working Environment | 0-40°C, relative humidity <80% |
| Power Source | AAA 1.5V battery (x2) |
| Dimensions (LWH) | 170mm x 65mm x 30mm (6.7in x 2.56in x 1.18in) |
| Weight | Approximately 160g (excluding batteries) |
| DC Voltage (DCV) Range | 4V-40V-400V-600V (±0.5%+3) |
| AC Voltage (ACV) Range | 4V-40V-400V-600V (±1%+3) |
| AC Current (ACA) Range | 15mA-4A-40A-400A-600A (±2.5%+8) |
| Resistance Range | 4kΩ-40kΩ-400kΩ-4MΩ-40MΩ (±0.5%+3) |
| Frequency Measurement Range | 4Hz-40Hz-400Hz-4kHz-40kHz-400kHz- |
| True RMS Measurement | Yes |
| Flashlight Lighting | Yes |
| HOLD Function | Yes |
| Auto Power Off | Yes |
| Color Options | Red, Blue, Orange, Black |
Figure 8.2: Detailed dimensions of the ANENG ST203, showing its compact and ergonomic size.
9. Warranty and Support
For any questions regarding the operation, maintenance, or troubleshooting of your ANENG ST203 Digital Multimeter Clamp Meter, please refer to this manual. If further assistance is required, contact the seller or manufacturer's customer support channel. Please retain your purchase receipt for any warranty claims, though specific warranty terms are not detailed here.
