MT87 Digital Clamp Multimeter Instruction Manual

1. Product Overview

The MT87 Digital Clamp Multimeter is a versatile and essential tool for electricians and DIY enthusiasts, designed for safe and accurate measurement of various electrical parameters. It features overload protection, data hold, and a clear digital display for easy readings.

MT87 Digital Clamp Multimeter with test leads — Figure 1: MT87 Digital Clamp Multimeter with included test leads.

Two MT87 multimeters (red and orange) highlighting features like overload protection, data hold, buzzer, and diode measurement. — Figure 2: Key features of the MT87 Digital Clamp Multimeter, including overload protection and data hold.

2. Controls and Parts Identification

Familiarize yourself with the components of your MT87 Digital Clamp Multimeter:

Diagram of MT87 Multimeter with labeled parts: Clamp Head, Clamp Head Handle, Alternating Current, Alternating Voltage, DC Voltage, On-off Buzzer, LCD Display, Negative Input Jack (Black Test Pencil), Positive Input Jack (Red Test Pencil), Data Hold, Function/Fear Switch, Close Button, Electric Resistance Gear. — Figure 3: Labeled diagram of the MT87 Digital Clamp Multimeter components.

Clamp Head: Used for non-contact AC current measurement.
Clamp Head Handle: Operates the clamp head opening.
Alternating Current (AC A) Range: Settings for measuring AC current.
Alternating Voltage (AC V) Range: Settings for measuring AC voltage.
DC Voltage (DC V) Range: Settings for measuring DC voltage.
On-off Buzzer / Continuity: For continuity testing.
LCD Display: Shows measurement readings.
Negative Input Jack (COM): For the black test lead.
Positive Input Jack (VΩmA): For the red test lead for voltage, resistance, and diode measurements.
Data Hold Button: Freezes the current reading on the display.
Function/Range Switch: Rotary dial to select measurement function and range.
OFF Button: Powers off the device.
Electric Resistance Gear (Ω): Settings for measuring resistance.

3. Setup and Battery Installation

Battery Installation:
The MT87 Multimeter requires 2 x AAA batteries (not included). Locate the battery compartment on the back of the device, open it, insert the batteries observing polarity, and close the compartment securely.
Connecting Test Leads:
Insert the black test lead into the 'COM' (Negative Input Jack) port. Insert the red test lead into the 'VΩmA' (Positive Input Jack) port for voltage, resistance, and diode measurements.
Power On:
Turn the Function/Range Switch from 'OFF' to the desired measurement function to power on the device.

4. Operating Instructions

Always ensure the correct function and range are selected before making any measurements. Observe all safety precautions when working with electricity.

4.1. Measuring DC Voltage

Set the Function/Range Switch to the 'DC V' range.
Connect the red test lead to the positive side of the circuit and the black test lead to the negative side.
Read the voltage value on the LCD display.

MT87 Multimeter measuring DC voltage from an outlet with test leads connected. — Figure 4: Example of DC Voltage measurement.

4.2. Measuring AC Voltage

Set the Function/Range Switch to the 'AC V' range.
Connect the test leads across the AC voltage source.
Read the voltage value on the LCD display.

MT87 Multimeter measuring AC voltage from a battery with test leads connected. — Figure 5: Example of AC Voltage measurement.

4.3. Measuring AC Current (Clamp Function)

Set the Function/Range Switch to the 'AC A' range.
Open the clamp head using the handle.
Enclose only ONE conductor (not a cable with multiple conductors) within the clamp head.
Read the current value on the LCD display.

MT87 Multimeter clamp head around a single wire to measure AC current. — Figure 6: Example of AC Current measurement using the clamp function.

4.4. Measuring Resistance

Set the Function/Range Switch to the 'Ω' (Resistance) range.
Ensure the circuit or component is de-energized before measuring resistance.
Connect the test leads across the component to be measured.
Read the resistance value on the LCD display.

MT87 Multimeter measuring resistance with test leads connected to a component. — Figure 7: Example of Resistance measurement.

4.5. Diode Test and Continuity

Set the Function/Range Switch to the Diode/Continuity symbol (often shared with resistance or a dedicated symbol).
For Diode Test: Connect the red lead to the anode and the black lead to the cathode. The display will show the forward voltage drop. Reverse the leads; an open circuit reading indicates a good diode.
For Continuity: Connect the test leads across the component. A continuous beep indicates continuity (low resistance).

4.6. Data Hold Function

Press the 'DATA HOLD' button to freeze the current reading on the LCD display. Press it again to release and resume live measurements.

5. Maintenance

Cleaning: Wipe the device with a dry, soft cloth. Do not use abrasive cleaners or solvents.
Battery Replacement: Replace batteries when the low battery indicator appears on the display to ensure accurate readings. Always use 2 x AAA batteries.
Storage: Store the multimeter in a cool, dry place away from direct sunlight and extreme temperatures. If storing for extended periods, remove the batteries to prevent leakage.
Test Leads: Inspect test leads regularly for any signs of damage (cracks, frayed insulation). Replace damaged leads immediately to ensure safety and accuracy.

6. Troubleshooting

Problem	Possible Cause	Solution
No display or dim display	Low or dead batteries; incorrect battery installation.	Replace batteries (2 x AAA) and ensure correct polarity.
Incorrect readings	Wrong function/range selected; poor test lead connection; damaged test leads.	Verify function/range; ensure secure connections; inspect and replace damaged leads.
No continuity beep	Circuit is open; multimeter not in continuity mode.	Check circuit for breaks; ensure rotary switch is set to continuity.
Clamp function not working	Multiple conductors inside clamp; clamp not fully closed.	Ensure only one conductor is clamped; check clamp mechanism for obstructions.

7. Specifications

Table of product parameters including DC Voltage, Alternating Current, AC Voltage, Electric Resistance, Diode Test, On-off Buzzer, Overload Protection, Data Hold, Battery, and Overall Dimensions. — Figure 8: Detailed product parameters and special functions.

Parameter	Range	Resolution (where applicable)
Product Name	Clamp Multimeter
DC Voltage	0-600V	1V
Alternating Current	20A/200A/400A	10mA/100mA/1A
AC Voltage	0-450V	1V
Electric Resistance	0-200KΩ	100Ω
Display Type	Digital Display
Operating Temperature	0-40℃
Battery Type	2 x AAA (not included)
Product Weight	142 G / 5.01 Ounces
Overall Dimensions (LWH)	1495227 MM / 5.872.051.06 Inches
Jaw Opening	25mm
Certification	CE

Special Functions:

Diode Test
On-off Buzzer (Continuity)
Overload Protection
Data Hold

8. User Tips

For accurate AC current measurements, ensure the clamp jaw completely encloses only one live conductor. Clamping around a power cord with both live and neutral wires will result in a zero reading due to canceling magnetic fields.
Always start with the highest range setting when measuring an unknown voltage or current to prevent overloading the meter, then adjust downwards if necessary for better resolution.
Before measuring resistance or continuity, always ensure the circuit or component is completely de-energized to avoid damage to the multimeter or personal injury.
The compact size of the MT87 makes it convenient for carrying in a tool bag, but always store it in a protective case to prevent damage to the display or rotary switch.

MT87 Multimeter held in hand, showing its compact size and 25mm jaw opening. — Figure 9: The compact design and 25mm jaw opening of the MT87 multimeter.

9. Warranty and Support

The MT87 Digital Clamp Multimeter is designed for reliability and safety, holding CE certification. For any technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact the seller or manufacturer directly. Keep your purchase records for reference.

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