TOOLTOP ET8135 Digital Multimeter User Manual

1. Introduction

The TOOLTOP ET8135 is an intelligent digital multimeter designed for precise electrical measurements. Featuring a 9999-count color display and True RMS capabilities, it offers a wide range of functions including DC/AC voltage, DC/AC current, resistance, capacitance, diode, continuity, NCV (Non-Contact Voltage), frequency, and temperature measurements. This manual provides essential information for safe and effective use of the instrument.

Figure 1: TOOLTOP ET8135 Digital Multimeter

2. Safety Information

Warning: To fully understand how to use the instrument safely and effectively, please carefully read and follow the instructions in this manual. It is essential to exercise caution while operating the instrument, as improper usage can result in electric shock or damage to the instrument. Always adhere to standard safety procedures and take necessary precautions when using the instrument.

This instrument meets the safety requirements for electronic measurement instruments under IEC-61010-1, IEC-61010-2-030, IEC-61010-2-032, classified as Pollution Degree 2, and has an overvoltage rating of CAT III 600V. Ensure you follow the safety guidelines provided for the secure operation of the instrument.

2.1 Safety Notices

• When Using the Instrument:
1. Adhere to standard safety protocols.
2. Protect against electric shock.
3. Prevent any misuse of the instrument.
• Upon Receiving the Instrument: Inspect the instrument for any potential damage that may have occurred during transportation.
• After Storage or Shipping in Harsh Conditions: Examine and confirm that the instrument is undamaged.
• Ensure that the test leads are in good condition. Before using them, check for any damage to the insulation or exposed wire conductors.

2.2 Electrical Symbols

3. Product Overview

3.1 Component Names

Figure 2: Multimeter Component Diagram

1. Non-contact voltage detection sensing area
2. Flashlight
3. Function switch button
4. Display screen
5. Input socket
6. Power button

3.2 LCD Display

Figure 3: LCD Display Overview

4. Setup

4.1 Battery Installation

The TOOLTOP ET8135 requires two 1.5V AAA-sized batteries (not included). To install or replace batteries:

1. Turn off the instrument's power.
2. Remove all test leads from the input sockets.
3. Use a screwdriver to loosen the screw securing the battery cover on the back of the device.
4. Remove the battery cover.
5. Insert two new 1.5V AAA batteries, observing correct polarity.
6. Replace the battery cover and tighten the screw.

Note: Replace the battery immediately when the instrument displays the low battery symbol ( ) to prevent incorrect readings.

4.2 Connecting Test Leads

The multimeter comes with a pair of test leads. Always ensure the test leads are in good condition, checking for any damage to the insulation or exposed wires before use. The test leads must be rated for 1000V 10A.

1. For most measurements, insert the black test lead into the COM (common) input socket.
2. Insert the red test lead into the INPUT socket for voltage, resistance, capacitance, diode, and continuity measurements.
3. For current measurements (A/mA), insert the red test lead into the A/mA input socket.

Figure 4: Product Accessories

5. Operating Instructions

5.1 General Operation

1. Power On/Off: Briefly press the power button to turn on the instrument. Long-press the power button to turn it off.
2. Auto-Scan Mode: When the instrument is not in a specific measurement mode, it will enter an automatic scanning state, and the display will show "Auto".
3. Reading Hold: To freeze the displayed reading, briefly press the "H" button. Press it again to release.
4. Flashlight: Activate the flashlight by briefly pressing the flashlight button. It will automatically turn off after approximately 5 minutes.
5. Auto Power Off: If there is no activity for 15 minutes, the instrument will enter sleep mode and power off. A warning beep will sound 1 minute before shutdown. Press the power button to awaken it.

5.2 Measurement Functions

Figure 5: Smart Multimeter Functions

5.2.1 Non-Contact Voltage Detection (NCV)

1. Press and hold the NCV button to activate the NCV function; the instrument will display "NCV."
2. Position the NCV sensor near the wire to be tested. The instrument can determine if the wire carries an AC voltage exceeding 90V.
3. When AC voltage is detected, the instrument will trigger an alarm, and the LCD will indicate the detection strength.

Note: Even without an alarm, voltage may still be present. Do not solely rely on NCV for voltage detection. Socket design and insulation thickness can influence detection. In NCV mode, the instrument does not simultaneously measure other parameters.

Figure 6: NCV Detection

5.2.2 DC Voltage Measurement

1. Insert the black test lead into the COM socket and the red test lead into the INPUT socket.
2. Connect the test leads to the voltage source or load.
3. Read the value displayed on the LCD.

Note: In AUTO mode, the instrument displays DC voltage when the signal is >0.6V. If the signal is <0.6V, it defaults to resistance measurement. In mV range mode, the instrument displays DC voltage for signals <600.0mV. If >600.0mV, it shows "OL" (overload).

Figure 7: DC Voltage Measurement

5.2.3 AC Voltage Measurement

1. Insert the black test lead into the COM socket and the red test lead into the INPUT socket.
2. Connect the test leads to the voltage source or load.
3. Read the value displayed on the LCD.

Note: In AUTO mode, the instrument displays AC voltage when the signal is >0.6V. If the signal is <0.6V, it defaults to resistance measurement. Press "SEL" to switch to AC mV voltage mode. In mV range mode, the instrument displays AC voltage for signals <600.0mV. If >600.0mV, it shows "OL" (overload).

Figure 8: AC Voltage Measurement

5.2.4 AC/DC Current Measurement

1. Insert the black test lead into the COM input socket.
2. Insert the red test lead into the A/mA current input socket.
3. The instrument will automatically recognize the current range. The system defaults to the DC current range.

Note: If you remove the test lead from the A/mA socket, the system automatically switches to AUTO measurement mode. When measuring AC current, connect test leads in series. If the measured signal exceeds 20mA, the current value is displayed. If it exceeds 3000mA, the secondary display shows AC current frequency.

Figure 9: AC Current Measurement

5.2.5 Resistance Measurement

1. Insert the black test lead into the COM socket and the red test lead into the INPUT socket.
2. The instrument will be in automatic detection mode (AUTO range).
3. Connect the test leads to the resistance or circuit to be measured.
4. Read the value on the LCD display.

Note: If there is an open circuit, the LCD will display "OL." If the measured resistance is greater than 10MΩ, the reading may take a few seconds to stabilize.

Figure 10: Resistance Measurement Example

5.2.6 Live Wire Test

1. Press the "SEL" button to activate the LIVE mode; the instrument will indicate "LIVE" on the display.
2. Connect the red test lead to the INPUT socket.
3. Insert the probe into a power outlet's "L" slot or near a live wire.
4. The instrument will display signal strength and emit varying alarm sounds based on detected AC power or voltage intensity.

Figure 11: Live Wire (Fire Wire) Detection

5.2.7 Capacitance Measurement

1. Insert the black test lead into the COM socket and the red test lead into the INPUT socket.
2. Press "SEL" to select the capacitance mode.
3. Use the test leads to measure the capacitance value of the component.
4. Read the measurement value from the LCD.

Note: Before measuring, ensure the component is adequately discharged. Stable readings may take time, especially for large capacitors. Be mindful of polarity when measuring polarized capacitors.

Figure 12: Capacitance Measurement

5.2.8 Temperature Measurement

1. Press "SEL" to switch to the TEMP mode.
2. Insert the red plug of the thermocouple into the INPUT socket and the black plug into the COM socket.
3. Once the reading stabilizes, read the temperature value from the display.

Note: The provided K-type thermocouple can measure temperatures up to 250°C, with brief measurements reaching up to 300°C.

5.2.9 Diode Testing

1. Insert the black test lead into the COM socket and the red test lead into the INPUT socket.
2. Press the SEL key to switch to diode testing mode.
3. Connect the red test lead to the diode's anode and the black test lead to the diode's cathode.
4. Read the value on the LCD.

Note: The instrument displays an approximate value of the diode's forward voltage drop. If test leads are reversed or open, the LCD will show "OL."

Figure 13: Diode Testing

5.2.10 Continuity Test

Warning: Risk of electric shock. When conducting circuit continuity testing, ensure that the circuit's power is disconnected, and any capacitors in the circuit are fully discharged.

1. Insert the black test lead into the COM socket and the red test lead into the INPUT socket.
2. In AUTO mode, you can either perform a direct measurement or press the "SEL" key to switch to the circuit continuity testing mode.
3. Connect the test leads to both ends of the circuit.
4. If the resistance of the tested circuit is less than 50Ω, the internal buzzer will sound.

Note: If the test leads are open or the resistance exceeds 999.9Ω, it will display "OL."

Figure 14: Continuity Test

5.2.11 Frequency Measurement

The ET8135 can measure frequency in two ranges:

• Range A: 40 Hz - 1000 Hz, with input signal >3A AC current (RMS). Resolution: 0.01Hz (for 100.0 Hz), 0.1Hz (for 1000Hz). Accuracy: ± (1.0% of reading + 5 digits).
• Range V: 40 Hz - 1000 Hz, with input signal >1V AC current (RMS). Resolution: 0.01Hz (for 100.0 Hz), 0.1Hz (for 1000Hz). Accuracy: ± (1.0% of reading + 5 digits).

6. Technical Specifications

The instrument should undergo recalibration annually under the following conditions: temperature ranging from 18°C to 28°C, and relative humidity remaining below 75%.

6.1 General Specifications

• Automatic selection of measurement function and range.
• Comprehensive protection against full-range overloads.
• Maximum permissible voltage between the measurement terminal and ground: 1000V DC or 600V AC.
• Operational altitude: up to 2000 meters.
• Display: Color LCD, 9999 digits max.
• Polarity indication: Automatic, with "-" indicating negative polarity.
• Overrange display: "OL" or "OL".
• Sampling rate: approximately 3 times per second.
• Unit display: Functional with unit indication.
• Auto power-off time: 15 minutes.
• Power supply: Two 1.5V AAA-sized batteries.
• Low battery indication: Indicated by a symbol on the LCD.
• Temperature coefficient: Less than 0.1× accuracy per degree Celsius.
• Operating temperature: 0°C to 40°C.
• Storage temperature: -20°C to 60°C.

6.2 Measurement Specifications

7. Maintenance

7.1 General Maintenance

• Do not attempt to open the bottom cover or make any adjustments or repairs unless you are a trained technician.
• Before opening the instrument's bottom cover, ensure that you have removed the test leads from the circuit being measured.
• Clean the instrument using a damp cloth and a mild detergent. Avoid abrasive or solvent-based cleaners.
• Turn off the power when the instrument is not in use.

7.2 Battery and Fuse Replacement

Warning: When replacing the instrument's battery or fuse, it is crucial to ensure that the test leads have been removed from the measuring circuit to prevent the risk of electric shock.

Follow the steps in Section 4.1 for battery replacement. If a fuse needs replacement, follow similar steps to access the fuse compartment (usually located under the battery cover or a separate bottom cover) and replace it with a fuse of the correct rating (e.g., 10A/250V).

7.3 Test Lead Replacement

Warning: When replacing test leads, it is vital to use the same or equivalent grade of leads. The test leads must be in good condition, with a rating of 1000V 10A.

Note: If the insulation layer of the test leads is damaged, such as wire conductors being exposed, the test leads must be replaced immediately.

8. Troubleshooting

9. User Tips

• The ET8135 is highly sensitive, especially in mV range mode. Fluctuating readings with an open-circuit input are normal; accurate measurements are obtained when test leads are connected to the circuit.
• When measuring high resistance (>10MΩ), allow a few seconds for the reading to stabilize.
• Always ensure capacitors are fully discharged before measuring capacitance to prevent damage to the instrument.
• For temperature measurements, the provided K-type thermocouple is suitable for up to 250°C, with brief measurements up to 300°C.
• This multimeter is ideal for various electrical DIY projects, offering accurate measurements for capacitance, resistance, voltage, and current.

10. Warranty and Support

TOOLTOP assures that this product complies with the measurement specifications, standards, and technical requirements as outlined in this user manual. Any modifications to the product may occur due to periodic optimizations, and changes to product-related information will be communicated separately if they do not impact the primary functionality of the product.

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