RuoShui 980+/9806+/9807a+ Digital Multimeter User Manual

1. Introduction

This manual provides detailed instructions for the safe and effective operation of the RuoShui 980+, 9806+, and 9807a+ series Digital Multimeters. These manual range multimeters are designed for measuring voltage, current, capacitance, and frequency, making them suitable for various electrical and electronic testing applications.

2. Safety Information

Always observe safety precautions when using the multimeter to avoid electric shock or personal injury. Read all safety information before operating the instrument.

• Do not exceed the maximum input values for any range.
• Ensure the test leads are properly connected and the function switch is in the correct position before making a measurement.
• Do not use the multimeter if it appears damaged or if the test leads are damaged.
• Exercise extreme caution when working with voltages above 60V DC or 30V AC RMS.
• Always disconnect power to the circuit under test and discharge all high-voltage capacitors before measuring resistance, continuity, diodes, or capacitance.
• Replace the battery when the low battery indicator appears to ensure accurate readings.

3. Product Overview and Components

Familiarize yourself with the different parts of your digital multimeter:

Image: Labeled diagram of the RuoShui Digital Multimeter, showing the front panel and rear features.

1. LCD display screen
2. Data retention/backlighting button (HOLD B/L)
3. Power button (POWER / AUTO POWER OFF)
4. Range knob (Function/Range Selector)
5. 2A/20A current socket
6. µA/mA current socket
7. Relative value/function switching button (REL/LPF / SELECT)
8. Max/Min button (MAX/MIN)
9. Transistor socket (hFE / EBC E NPN)
10. Voltage, resistance, frequency, and other sockets (VΩHz)
11. Common (COM) Jack
12. Pen slot
13. Battery compartment/bracket

The multimeter measures approximately 189mm (H) x 88mm (W) x 56mm (D).

Image: Multimeter dimensions showing 189mm height, 88mm width, and 56mm depth.

4. Setup

4.1 Battery Installation

The multimeter requires four AAA batteries for operation. Batteries are not included due to safety regulations during shipping.

1. Locate the battery compartment (13) on the back of the multimeter.
2. Use a screwdriver to open the battery compartment cover.
3. Insert four AAA batteries, ensuring correct polarity (+ and -).
4. Close the battery compartment cover and secure it with the screw.

4.2 Connecting Test Leads

Always ensure test leads are in good condition before use.

• For most measurements (Voltage, Resistance, Frequency, Capacitance, Diode, Continuity), insert the black test lead into the COM jack (11) and the red test lead into the VΩHz jack (10).
• For current measurements up to 200mA, insert the red test lead into the µA/mA current socket (6).
• For high current measurements (2A/20A), insert the red test lead into the 2A/20A current socket (5).

5. Operating Instructions

The RuoShui multimeters feature a 19999 (4 1/2) bit backlit LCD display for clear and intuitive readings.

Image: Detail of the multimeter's backlit large screen display, showing a 19999 count.

5.1 Basic Operation

• Power On/Off: Press the POWER button (3) to turn the multimeter on or off.
• Function Selection: Rotate the Range knob (4) to select the desired measurement function (e.g., DCV, ACV, DCA, ACA, Resistance, Capacitance, Frequency, Diode, Continuity, hFE).
• Data Hold: Press the HOLD B/L button (2) to freeze the current reading on the display. Press again to release.
• Backlight: Press and hold the HOLD B/L button (2) to turn the backlight on or off.
• Max/Min: Press the MAX/MIN button (8) to record maximum and minimum values during a measurement.
• Relative Value (REL): Press the REL/LPF button (7) to enter relative measurement mode, displaying the difference between the current reading and a stored reference value.
• Low Pass Filter (LPF): For models 9806+ and 9807A+, press the REL/LPF button (7) to activate the Low Pass Filter for AC voltage measurements in noisy environments.
• Hz% Mode Key: For models 9806+ and 9807A+, this key allows switching between Frequency (Hz) and Duty Cycle (%) measurements.

5.2 Measurement Procedures

Image: Visual guide for connecting test leads for Voltage, Current, Conductivity, Capacitor, On/Off (Continuity), Diode, and Resistance measurements.

Image: Visual guide for connecting test leads for Hz% mode, transistor (hFE), and frequency measurements.

5.2.1 Voltage Measurement (DCV/ACV)

1. Insert the black test lead into the COM jack and the red test lead into the VΩHz jack.
2. Rotate the Range knob to the desired DCV or ACV range.
3. Connect the test leads in parallel to the circuit or component to be measured.
4. Read the voltage value on the display.

5.2.2 Current Measurement (DCA/ACA)

1. IMPORTANT: Disconnect power to the circuit.
2. Insert the black test lead into the COM jack.
3. For µA/mA current, insert the red test lead into the µA/mA jack. For 2A/20A current, insert the red test lead into the 2A/20A jack.
4. Rotate the Range knob to the desired DCA or ACA range.
5. Break the circuit and connect the multimeter in series with the component to be measured.
6. Apply power to the circuit and read the current value.

5.2.3 Resistance Measurement (Ω)

1. IMPORTANT: Ensure the circuit is de-energized and all capacitors are discharged.
2. Insert the black test lead into the COM jack and the red test lead into the VΩHz jack.
3. Rotate the Range knob to the Ω range.
4. Connect the test leads across the component to be measured.
5. Read the resistance value on the display.

5.2.4 Continuity Test

1. IMPORTANT: Ensure the circuit is de-energized.
2. Insert the black test lead into the COM jack and the red test lead into the VΩHz jack.
3. Rotate the Range knob to the continuity (buzzer) symbol.
4. Touch the test leads across the component or wire. A continuous beep indicates continuity.

5.2.5 Diode Test

1. IMPORTANT: Ensure the circuit is de-energized.
2. Insert the black test lead into the COM jack and the red test lead into the VΩHz jack.
3. Rotate the Range knob to the diode symbol.
4. Connect the red test lead to the anode and the black test lead to the cathode of the diode. The display will show the forward voltage drop. Reverse the leads; the display should show 'OL' (Open Loop) for a good diode.

5.2.6 Capacitance Measurement (F)

1. IMPORTANT: Ensure the capacitor is fully discharged before testing.
2. Insert the black test lead into the COM jack and the red test lead into the VΩHz jack.
3. Rotate the Range knob to the capacitance (F) range.
4. Connect the test leads across the capacitor.
5. Read the capacitance value on the display.

5.2.7 Frequency Measurement (Hz)

1. Insert the black test lead into the COM jack and the red test lead into the VΩHz jack.
2. Rotate the Range knob to the Hz range.
3. Connect the test leads to the signal source.
4. Read the frequency value on the display.

5.2.8 Transistor (hFE) Measurement

1. Rotate the Range knob to the hFE range.
2. Insert the transistor's Emitter, Base, and Collector leads into the corresponding holes in the transistor socket (9).
3. Read the hFE value on the display.

5.3 Automatic Power Off

The instrument automatically shuts down after about 15 minutes of inactivity to save battery life. This feature can typically be disabled by holding down a specific button (refer to the specific model's detailed manual if available) during power-on, though this general manual does not specify which button.

Image: Multimeter screen showing 'APO' indicating Automatic Power Off after 15 minutes of inactivity, powered by 4 AAA batteries.

6. Maintenance

6.1 General Care

• Keep the multimeter dry. If it gets wet, wipe it dry immediately.
• Use and store the multimeter in normal temperature environments. Extreme temperatures can shorten the life of electronic devices.
• Handle the multimeter gently and carefully. Dropping it can damage circuit boards and cases.
• Keep the multimeter away from dust and dirt, which can cause corrosion.
• Wipe the multimeter with a damp cloth occasionally to keep it looking new. Do not use harsh chemicals, cleaning solvents, or strong detergents.

6.2 Intelligent Burn Prevention

The multimeter is designed with intelligent burn prevention features, including glass explosion-proof fuses for current input sockets (200mA and 20A) to protect the instrument from being damaged by overcurrents, provided the connected voltage is below 250V.

Image: Internal view of the multimeter's circuit board, highlighting the 200mA and 20A fuses designed for intelligent burn prevention.

6.3 Battery Replacement

When the low battery indicator appears on the display, replace the batteries promptly to ensure accurate measurements. Refer to section 4.1 for battery installation instructions.

7. Troubleshooting

• No Display: Check if the power button is pressed. Ensure batteries are correctly installed and not depleted.
• Inaccurate Readings: Replace batteries if the low battery indicator is on. Ensure test leads are properly connected and not damaged. Verify the correct function and range are selected.
• 'OL' (Overload) Display: The measured value exceeds the selected range. Switch to a higher range or verify the circuit is within the instrument's capabilities.
• No Continuity Beep: Ensure the circuit is de-energized. Check test leads for damage.

8. Specifications

The following tables detail the technical specifications for the RuoShui 980+, 9806+, and 9807a+ Digital Multimeters.

8.1 General Characteristics

Image: Table summarizing general characteristics including display, true RMS, on/off buzzing, data retention, backlight, sampling rate, auto shutdown, power source, size, and weight.

8.2 Measurement Ranges and Accuracy

Image: Technical parameter table detailing ranges, resolutions, and accuracies for DC Voltage, AC Voltage, and DC Current across models 980+, 9806+, and 9807A+.

Image: Technical parameter table detailing ranges, resolutions, and accuracies for AC Current, Resistance, and Capacitance across models 980+, 9806+, and 9807A+.

9. User Tips

• Always start with the highest range when measuring an unknown value to prevent overloading the meter.
• For stable readings, ensure good contact between the test leads and the circuit points.
• When measuring AC voltage in environments with electrical noise, utilize the Low Pass Filter (LPF) function on compatible models (9806+/9807A+) for more accurate results.
• Remember to turn off the multimeter after use to conserve battery life, although it features an automatic power-off function.

10. Warranty and Support

RuoShui (Victor) instruments are backed by a commitment to quality.

• All products are 100% genuine original RuoShui (Victor) instruments.
• A 1-year warranty is provided for all products, excluding items damaged or misused after receipt. Accessories typically have a 3-month warranty.
• Defective items must be reported and returned within the warranty period, preferably in their original packaging.
• No battery will be sent with the product due to safety regulations.

11. Certifications

The RuoShui Digital Multimeters comply with various international standards and hold the following certifications:

Image: Collection of certification logos including CE, RoHS, UKCA, ISO, FC, and IAF, indicating compliance with various quality and safety standards.

• CE: Conforms to European Union health, safety, and environmental protection standards.
• RoHS: Compliant with the Restriction of Hazardous Substances Directive.
• UKCA: UK Conformity Assessed marking for products placed on the market in Great Britain.
• ISO: Certified under ISO 9001 for quality management systems.
• FC: Indicates compliance with Federal Communications Commission standards.
• IAF: Member of the International Accreditation Forum.