RuoShui 9801A+ Digital Multimeter Instruction Manual

1. Introduction

The RuoShui 9801A+ is a highly reliable and safe manual range handheld digital multimeter. It features a large LCD digital display and a durable dual-color injection molded exterior, making it a practical tool for electronic and electrical measurements. This instrument is designed for clear readings and convenient operation.

It offers a wide range of functions including measuring AC/DC voltage and current, resistance, diode, transistor (hFE), circuit on/off, capacitance, frequency, and temperature (°C/F). Additionally, it includes advanced features such as Non-Contact Voltage (NCV) induction measurement, Live Wire recognition, a built-in flashlight, automatic power off (APO), backlight function, data retention, relative value measurement, and maximum/minimum value measurement functions.

2. Safety Notes

WARNING: Always prioritize safety when using electrical measurement tools. Failure to follow safety guidelines can result in electric shock, fire, or personal injury.

• Input Limits: Do not exceed the specified input limits for any range. If the measured value's range is unknown, always start with the maximum range position.
• Voltage Measurement: Voltages less than 36V DC or 25V AC are considered safe. When measuring higher voltages, ensure proper connection and insulation of test leads to prevent electric shock. A "▲" symbol will be displayed for ACV/DCV inputs exceeding 24V.
• Function Gear: The functional gear must be set to the correct position before measurement. Never switch gears during measurement while connected to a circuit to prevent damage to the instrument.
• Battery & Cover: Do not operate the multimeter if the battery is not installed or the back cover is not tightened.
• Resistance, Current, Capacitor, Diode, On-Off Test: Do not input any voltage signal when performing these tests.
• Before Maintenance: Always remove test leads from the test point and turn off the power switch before replacing the battery or fuse.
• Personal Protective Equipment (PPE): Comply with local and national safety regulations. Wear approved rubber gloves, masks, and flame-retardant clothing when exposed to dangerous electrical conductors to prevent electric shock and arc injury.

3. Setup

3.1. Battery Installation

The RuoShui 9801A+ multimeter is powered by a 9V battery. To install or replace the battery:

1. Take the test leads away from any circuit and turn off the meter by long-pressing the "POWER APO" button.
2. Remove the screw on the battery door with a screwdriver.
3. Remove the battery door and bracket.
4. Insert a new 9V battery, ensuring correct polarity.
5. Replace the battery door and secure it with the screw.

When the low-voltage symbol "±" is displayed on the LCD, replace the battery immediately to maintain measurement accuracy.

3.2. Test Lead Storage

The back of the instrument's protective case features a pen storage slot and hanging holes, allowing for easy portability and organization of the test leads.

4. Operating Instructions

Before any operation, ensure the battery is properly installed and the function knob is set to the desired measurement type. If the low battery symbol appears, replace the battery before proceeding.

4.1. Function Panel Overview

4.2. General Operation Steps

1. Power On/Off: Long press the "POWER APO" button to turn the product on or off.
2. Test Lead Connection: Always connect the black test lead to the "COM" jack. The red test lead connects to the appropriate jack for the measurement type (e.g., "VΩ" for voltage/resistance, "mAuA" for small current, "2/20A" for large current).
3. Function Selection: Rotate the function range knob to the desired measurement type (e.g., DCV, ACV, Resistance, Capacitance, etc.).
4. Measurement: Connect the test leads to the circuit or component under test. Read the measurement results from the LCD.

4.3. AC/DC Voltage Measurement

1. Turn the knob to the corresponding ACV or DCV gear.
2. Insert the red test lead into the "VΩ" jack and the black test lead into the "COM" jack.
3. Connect the test leads to the circuit under test. The voltage and polarity will be displayed on the LCD.

NOTE:

• If the measured voltage is unknown, set the range knob to the highest range first, then adjust to a proper range.
• If "OL" is displayed, the value is beyond the current range; select a higher range.
• When measuring high voltage (above 220V), wear appropriate PPE.

4.4. AC/DC Current Measurement

1. Turn the knob to the corresponding ACA or DCA gear position.
2. Insert the red test lead into the "mAuA" jack (Max. 200mA) or "2/20A" jack (Max. 20A), and the black test lead into the "COM" jack.
3. Connect the test leads in series with the power supply or circuit under test. The measured current value and polarity will be displayed.

NOTE:

• If the current range is unknown, set it to the maximum range first. Do not measure voltage in the current jack.
• If "OL" is displayed, the value is beyond the current range; select a higher range.
• Continuous measurement of large currents (20A) can cause circuit heating and affect accuracy.
• When measuring large currents (above 10A), wear appropriate PPE.

4.5. Resistance Measurement

1. Set the knob to a proper resistance range.
2. Input the black test lead to the "COM" terminal and the red one to the "VΩ" terminal.
3. Connect the test leads across the resistance to be tested. Read the measurement results from the LCD.

NOTE:

• If "OL" is displayed, the resistance is beyond the present range; adjust the knob to a proper range. For values over 1MΩ, the reading may take a few seconds to stabilize.
• When measuring in-circuit resistance, ensure the power is off and all capacitors are discharged.

4.6. Capacitance Measurement

1. Switch to a proper capacitance range.
2. Input the black test lead to the "COM" terminal and the red test lead to the capacitance terminal.
3. Connect the test leads to the two sides of the tested capacitor (red test lead is "+"). Read the measurement results from the LCD.

NOTE:

• If "OL" is displayed, it is over range. The capacitance range is automatically converted.
• For accurate readings, especially for small capacitances, you can short press the "REL" key to clear the base value of the open circuit before measurement.
• Discharge the capacitor sufficiently before testing to prevent damage.

4.7. Diode and Continuity Test

1. Turn the knob to the →+))) range.
2. Input the black test lead to the "COM" terminal and the red one to the "VΩ" terminal.
3. Continuity Test: Connect the test leads to two points of the circuit. If resistance is below 50Ω, the LCD will display "→+)))" and the buzzer will sound.
4. Diode Test: Connect the test leads to the positive and negative terminals of the diode. The reading is an approximation of the forward voltage drop.

4.8. Transistor hFE Test

1. Set the knob to the "hFE" range.
2. Verify if the transistor under test is NPN or PNP.
3. Insert the emitter (E), base (B), and collector (C) leads into the proper jacks. The approximate hFE value will be displayed on the monitor.

4.9. Non-Contact Voltage (NCV) Induction Measurement

1. Set the knob to the "NCV" range. The LCD will display "EF".
2. Bring the upper position of the instrument close to the measured charged electric field (e.g., AC power line, socket).
3. When an electric field is sensed, the LCD displays horizontal segments, the upper red indicator lights will flash, and a buzzer will sound. The stronger the field, the more segments displayed and faster the flashing/sound.

4.10. Live Wire Recognition

1. Set the knob to "Live" range. The LCD will display "Live".
2. Input the red test lead to "VΩ" and touch the measurement point.
3. If there is a sound and light alarm, and the high pressure symbol "▲" shows on the LCD, the red test lead is connected to a live line. If nothing changes, it is not a live wire.

NOTE: This function only detects AC standard mains power lines (AC 110V~AC 380V).

4.11. Automatic Power Off (APO)

To save power, the APO function is enabled by default. If no operation occurs within 14 minutes, the meter will beep 3 times. If still no operation, it will automatically turn off after one minute. To cancel APO, long press the "POWER APO" button during power-on.

4.12. Data Hold

Short press the "HOLD" button to freeze the current measured value on the LCD. Press again to exit.

4.13. Backlight Control

Short press the "B/L" key to turn the LCD backlight on or off. The backlight automatically turns off after 15 seconds.

4.14. SELECT Function Conversion

Press the "SELECT" key at the AC1000V range to view ACV frequency. Press again to return to voltage measurement. At the temperature range, press "SELECT" to convert between °C and °F.

4.15. REL Measurement Mode

Short press the "REL" key to activate/deactivate relative value measurement mode. The relative value symbol will display on the LCD. This mode is applicable to ACV, DCV, ACA, DCA, capacitance, and temperature ranges.

4.16. Torch

Long press the torch key to turn the flashlight on or off. The flashlight is located at the bottom of the multimeter. It does not automatically turn off, so remember to turn it off manually to conserve power.

5. Specifications

The RuoShui 9801A+ Digital Multimeter is designed for high precision and strong stability, making it an ideal tool for laboratories, factories, radio hobbyists, and families.

5.1. Measurement Ranges and Accuracy

6. Maintenance

To ensure the longevity and proper functioning of your multimeter, follow these maintenance guidelines:

• Avoid Modification: Do not attempt to modify the electric circuit of the device.
• Storage Conditions: Keep the meter away from water, dust, and shock. Avoid storing or operating the meter in high temperature, high humidity, combustible, explosive, or strong magnetic environments.
• Cleaning: Wipe the case with a damp cloth and mild detergent. Do not use abrasives or alcohol.
• Long-Term Storage: If the meter will not be used for a long time, remove the battery to prevent leakage.
• Fuse Replacement: When replacing a fuse, always use a fuse of the same type and specification.

6.1. Fuse Specifications

• mA input fuse (FS1): Φ5x20mm 200mA 250V
• 20A input fuse (FS2): Φ5x20mm 20A 250V

7. Troubleshooting

If your multimeter is not functioning correctly, try the following methods to resolve common issues. If the problem persists, contact the repair center or dealer.

8. Warranty and Support

RuoShui (Victor) instruments are 100% genuine original products.

• Warranty Period: 1-year warranty for the product, excluding items damaged or misused after receipt. Accessories come with a 3-month warranty.
• Shipping Costs for Returns: If the product is not as advertised, the seller will cover shipping costs. Otherwise, the buyer is responsible for shipping costs.
• Defective Items: Defective items must be reported and returned within the warranty period, preferably in their original packaging.

For further assistance or to report issues, please contact your supplier or the manufacturer's support.

For a complete and detailed user manual, please refer to the official PDF document: User manual (PDF)

9. Packaging Accessories

The product package typically includes the following items:

• RuoShui Digital Multimeter (9801A+)
• Product Box
• Product Manual (this document and PDF)
• Test Leads (one pair)