ZOYI ZT301 / ZT302 / ZT303 Digital Multimeter Instruction Manual

1. Introduction

Thank you for choosing the ZOYI ZT301, ZT302, or ZT303 Digital Multimeter. These devices are auto-ranging, battery-powered multimeters featuring True-RMS measurement, a clear LCD display with backlight, and an auto-power off function to conserve battery life. They are designed for safe and accurate measurement of various electrical parameters in both professional and DIY electrical applications.

• ZT301: 8000 Counts
• ZT302: 9999 Counts
• ZT303: 19999 Counts

2. Safety Information

To ensure safe operation and service of the meter, please read all instructions carefully before use. Failure to observe safety warnings can result in severe injury or death.

• Always use the meter with the correct function and range selected.
• Do not exceed the maximum input values for any range.
• Inspect test leads for damage before each use. Do not use if insulation is damaged or bare metal is exposed.
• Ensure the meter is turned off and disconnected from the circuit before changing batteries or fuses.
• Do not use the meter if it appears damaged or if it is not operating properly.
• Be cautious when working with voltages above 30V AC RMS, 42V peak, or 60V DC. These voltages pose a shock hazard.
• Keep fingers behind the probe barriers during measurements.
• Do not operate the meter in explosive gas, vapor, or dust environments.

3. Package Contents

Please check the package for the following items:

• 2 x Test Leads
• 1 x Standard User Manual (this document)
• 1 x Drawstring Pouch
• 1 x Thermocouple Probe (for ZT301 and ZT303 models)
• Note: Batteries (2 x 1.5V AA) are not included due to customs inspection regulations.

4. Product Overview

The ZOYI Digital Multimeter features a robust design with an easy-to-read LCD and intuitive controls.

Key components include:

• LCD Display: Shows measurement readings, units, and function indicators.
• Rotary Switch: Used to select the primary measurement function (e.g., Voltage, Current, Resistance).
• Function Buttons:
• RANGE: Toggles between auto and manual ranging.
• HOLD/★: Freezes the current display reading. Long press activates backlight.
• REL△: Activates relative measurement mode.
• MAX/MIN: Records maximum and minimum values during a measurement session.
• SELECT: Toggles between different sub-functions within a rotary switch position (e.g., AC/DC voltage, Diode/Continuity).
• Input Jacks:
• COM: Common terminal for all measurements (connect black test lead).
• VΩmA: Input for Voltage, Resistance, Capacitance, Frequency, Diode, Continuity, and low current measurements (connect red test lead).
• 10A: Input for high current measurements up to 10A (connect red test lead).
• µA/mA: Input for microampere and milliampere current measurements (connect red test lead).
• NCV Sensor: For Non-Contact Voltage detection.

5. Setup

5.1. Battery Installation

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

5.2. Connecting Test Leads

1. Connect the black test lead to the 'COM' (Common) input jack.
2. Connect the red test lead to the 'VΩmA' input jack for most voltage, resistance, capacitance, and low current measurements.
3. For high current measurements (up to 10A), connect the red test lead to the '10A' input jack.
4. For microampere/milliampere current measurements, connect the red test lead to the 'µA/mA' input jack.

6. Operating Instructions

6.1. Power On/Off

Rotate the central rotary switch from the 'OFF' position to any desired measurement function to power on the meter. Rotate back to 'OFF' to power off.

6.2. Auto Ranging

The multimeter defaults to auto-ranging, automatically selecting the appropriate measurement range. Press the 'RANGE' button to switch to manual ranging, then press it again to cycle through available ranges. Press and hold 'RANGE' to return to auto-ranging.

6.3. Measurement Functions

6.3.1. DC/AC Voltage Measurement (V™)

1. Rotate the switch to the 'V' position.
2. Use the 'SELECT' button to toggle between DC (™) and AC (™) voltage.
3. Connect the test leads in parallel to the circuit or component being measured.
4. Read the voltage value on the display.

6.3.2. DC/AC Current Measurement (A)

1. Rotate the switch to the 'A' (Amperes) position.
2. Use the 'SELECT' button to toggle between DC (™) and AC (™) current.
3. For currents up to 600mA, connect the red lead to the 'µA/mA' jack. For currents up to 10A, connect the red lead to the '10A' jack.
4. Connect the test leads in series with the circuit.
5. Read the current value on the display.
6. Caution: Never connect the meter in parallel to a voltage source when measuring current, as this can blow the fuse or damage the meter.

6.3.3. Resistance Measurement (Ω)

1. Rotate the switch to the 'Ω' (Ohms) position.
2. Ensure the circuit is de-energized before measuring resistance.
3. Connect the test leads across the component.
4. Read the resistance value on the display.

6.3.4. Capacitance Measurement (F)

1. Rotate the switch to the 'F' (Farad) position.
2. Ensure the capacitor is fully discharged before measurement.
3. Connect the test leads across the capacitor.
4. Read the capacitance value on the display.

6.3.5. Frequency (Hz) and Duty Cycle (%) Measurement

1. Rotate the switch to the 'Hz%' position.
2. Use the 'SELECT' button to toggle between Frequency and Duty Cycle.
3. Connect the test leads to the signal source.
4. Read the frequency or duty cycle value on the display.

6.3.6. Diode Test (→|→) and Continuity Test (♫)

1. Rotate the switch to the '→|→♫' position.
2. Use the 'SELECT' button to toggle between Diode Test and Continuity Test.
3. For Diode Test: Connect the red lead to the anode and black lead to the cathode. Read the forward voltage drop. Reverse leads for reverse bias.
4. For Continuity Test: Connect the leads across the circuit. A beep indicates continuity (low resistance).

6.3.7. Temperature Measurement (℃/℉)

1. Rotate the switch to the '℃/℉' position.
2. Connect the thermocouple probe to the VΩmA and COM jacks, observing polarity.
3. Place the tip of the thermocouple on the object whose temperature is to be measured.
4. Read the temperature value on the display.

6.4. Special Functions

• HOLD: Press 'HOLD' to freeze the current reading on the display. Press again to release.
• Backlight: Long press the 'HOLD/★' button to turn the backlight on or off.
• REL△ (Relative Measurement): Press 'REL△' to store the current reading as a reference. Subsequent measurements will show the difference from this reference. Press again to exit.
• MAX/MIN: Press 'MAX/MIN' to enter Max/Min recording mode. The meter will display the maximum or minimum value measured since activation. Press again to cycle between MAX, MIN, and current reading. Long press to exit.
• NCV (Non-Contact Voltage): Rotate the switch to 'NCV'. Place the top of the meter near an AC voltage source. The meter will indicate the presence of AC voltage without direct contact.
• Auto Power Off (APO): The meter will automatically power off after a period of inactivity to save battery. Press any button or rotate the switch to wake it up.
• Low Battery Alert: A battery icon will appear on the display when the battery voltage is low, indicating that batteries should be replaced soon.

7. Maintenance

7.1. Cleaning

Wipe the case with a damp cloth and mild detergent. Do not use abrasives or solvents. Keep the input terminals free of dirt and moisture.

7.2. Battery Replacement

When the low battery indicator appears on the display, replace the batteries as described in the 'Battery Installation' section (Section 5.1).

7.3. Fuse Replacement

If the current measurement function stops working, the fuse may be blown. Refer to the specifications for the correct fuse type and rating. To replace, open the back cover (similar to battery replacement), locate the fuse, and replace it with a new one of the same type and rating. Always ensure the meter is disconnected from all circuits and powered off before replacing fuses.

7.4. Storage

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

8. Troubleshooting

9. Specifications

The following tables detail the specifications for the ZOYI ZT301, ZT302, and ZT303 Digital Multimeters.

General Specifications (Applicable to ZT301, ZT302, ZT303)

Model-Specific Measurement Ranges and Accuracies

10. Warranty and Support

For warranty information, technical support, or service inquiries, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase.