ZOYI ZT-98 Digital Multimeter Instruction Manual

1. Introduction

The ZOYI ZT-98 is a compact, auto-ranging digital multimeter designed for measuring AC/DC voltage, AC/DC current, resistance, and continuity. It features a backlit HD display, auto power-off, and a low voltage warning, making it a reliable tool for electrical testing and troubleshooting in various applications.

2. Safety Information

Always observe basic safety precautions when using this multimeter to avoid electric shock or personal injury. Read and understand all instructions before use.

• Do not exceed the maximum input values specified for each measurement range.
• Ensure the test leads are properly connected and in good condition before making any measurements.
• Do not use the meter if it appears damaged or if the insulation on the test leads is compromised.
• Exercise extreme caution when working with voltages above 30V AC RMS, 42V peak, or 60V DC, as these pose a shock hazard.
• Always turn off the circuit power and discharge high-voltage capacitors before measuring resistance or continuity.
• Replace batteries immediately when the low battery indicator appears to ensure accurate readings.

3. Package Contents

Verify that all items are present in your package:

• ZOYI ZT-98 Digital Multimeter
• Test Leads (Red and Black)
• User Manual
• Color Box Packaging

4. Product Overview

Familiarize yourself with the components and controls of your ZOYI ZT-98 Digital Multimeter:

• HD Display: Shows measurement readings and indicators.
• Backlight Button: Activates the screen backlight for low-light conditions.
• AUTO/POWER OFF Button: Toggles auto-ranging mode and manual power off.
• SEL Button: Selects between different functions within a rotary dial position (e.g., AC/DC voltage, Diode/Continuity).
• Rotary Dial: Used to select the desired measurement function (Voltage, Resistance, Current, OFF).
• Function Port (VΩ+))): Input for voltage, resistance, diode, and continuity measurements.
• Public Port (COM): Common input for all measurements (black test lead).
• Milliampere/Microampere Port (mA uA): Input for current measurements up to 200mA.
• FUSED 200mA MAX: Indicates the fuse protection for the current input.
• Back Bracket: Allows the multimeter to stand upright for hands-free operation.

5. Specifications

6. Setup

6.1 Battery Installation

1. Ensure the multimeter is turned OFF.
2. Locate the battery compartment on the back of the device.
3. Use a screwdriver to open the battery cover.
4. Insert two 1.5V AAA batteries, observing the correct polarity (+/-).
5. Close the battery cover and secure it with the screw.

6.2 Connecting Test Leads

1. Insert the black test lead into the 'COM' (Common) jack.
2. For voltage, resistance, diode, and continuity measurements, insert the red test lead into the 'VΩ+))' jack.
3. For current measurements (mA/uA), insert the red test lead into the 'mA uA' jack.

7. Operating Modes

The ZT-98 features an auto-ranging function, simplifying operation by automatically selecting the appropriate range for the measurement. Use the rotary dial to select the desired function.

7.1 AC Voltage Measurement

1. Set the rotary dial to the 'V~' position.
2. Connect the red test lead to the 'VΩ+))' jack and the black test lead to the 'COM' jack.
3. Touch the test probes to the points in the circuit where you want to measure AC voltage.
4. The display will show the AC voltage reading.

7.2 DC Voltage Measurement

1. Set the rotary dial to the 'V-' position.
2. Connect the red test lead to the 'VΩ+))' jack and the black test lead to the 'COM' jack.
3. Touch the red probe to the positive side and the black probe to the negative side of the DC source.
4. The display will show the DC voltage reading.

7.3 Resistance Measurement

1. Set the rotary dial to the 'Ω' position.
2. Connect the red test lead to the 'VΩ+))' jack and the black test lead to the 'COM' jack.
3. Ensure the circuit or component is de-energized.
4. Touch the test probes across the component to measure its resistance.
5. The display will show the resistance reading in Ohms (Ω), Kilo-Ohms (kΩ), or Mega-Ohms (MΩ).

7.4 Continuity (On-off Beep)

1. Set the rotary dial to the 'Ω' position. Press the 'SEL' button until the continuity symbol (a speaker icon) appears on the display.
2. Connect the red test lead to the 'VΩ+))' jack and the black test lead to the 'COM' jack.
3. Ensure the circuit or component is de-energized.
4. Touch the test probes across the component or wire.
5. If there is continuity (a complete circuit), the meter will emit an audible beep and display a low resistance value. If there is no continuity, it will display 'OL' (Open Line).

7.5 AC/DC Current Measurement (mA/uA)

1. IMPORTANT: For current measurements, the meter must be connected in series with the circuit. Never connect the meter in parallel across a voltage source when in current mode, as this can damage the meter and the circuit.
2. Set the rotary dial to the 'mA uA' position. Use the 'SEL' button to switch between AC (A~) and DC (A-) current.
3. Connect the red test lead to the 'mA uA' jack and the black test lead to the 'COM' jack.
4. Open the circuit where you want to measure current and connect the meter in series.
5. The display will show the current reading.

8. Maintenance

8.1 Cleaning

Wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. Keep the test leads clean and free of debris.

8.2 Battery Replacement

When the low battery indicator appears on the display, replace the batteries promptly to ensure accurate readings. Follow the battery installation steps in Section 6.1.

8.3 Storage

If the meter is not to be used for a long period, remove the batteries to prevent leakage and damage to the device. Store the multimeter in a cool, dry place away from direct sunlight.

9. Troubleshooting

• No Display/Power: Check battery installation and ensure batteries are not depleted. Replace if necessary.
• 'OL' on Display: Indicates an open circuit (for continuity/resistance) or that the measured value exceeds the meter's range.
• Inaccurate Readings: Ensure test leads are properly connected, batteries are fresh, and the correct measurement function is selected. Check for external interference.
• No Beep in Continuity Mode: Ensure the 'SEL' button has been pressed to activate continuity mode (speaker icon visible). Check if the circuit is truly continuous.

10. User Tips

• Always start with the highest range when measuring an unknown voltage or current to prevent overloading the meter, although the auto-ranging feature helps mitigate this.
• For stable readings, ensure good contact between the test probes and the circuit points.
• Utilize the back bracket for hands-free operation, especially when taking multiple measurements or needing to observe the display for an extended period.
• The backlight feature is useful in dimly lit environments, conserving battery life when not needed.

11. Warranty and Support

For warranty information, technical support, or service inquiries, please refer to the seller's policies or contact the ZOYI Official Store directly. Keep your purchase receipt as proof of purchase.