MESTEK CM87C Digital Clamp Meter Multimeter

1. Product Overview

The MESTEK CM87C is a True-RMS digital clamp meter designed for accurate and safe measurement of various electrical parameters. It features a 6000-count display and a maximum current capacity of 600A. This versatile tool is suitable for electricians, DIY enthusiasts, and professionals, helping to quickly and safely diagnose electrical issues in automotive, industrial, or home settings.


 

Key Features:

• 6000 Counts Display: Provides high-resolution readings.
• True-RMS Measurement: Ensures accurate readings for non-sinusoidal waveforms.
• 600A Max Current: Capable of measuring high AC/DC currents.
• Multiple Measurement Functions: AC/DC Current, AC/DC Voltage, Inrush Current, Capacitance, Resistance, Continuity, Diode, Frequency, Temperature.
• Specialized Modes: VFD (Variable Frequency Drive Filtering) and LoZ (Low Input Impedance) for enhanced accuracy.
• Non-Contact Voltage (NCV) Detection: Safely detects voltage without direct contact.
• Live Wire Detection: Identifies live wires for safety.
• User-Friendly Design: Large backlit LCD display, built-in flashlight, data hold, low battery indicator, auto shut-off, Max/Min recording.
• Durable Construction: Dual-color molded housing with ergonomic soft rubber grip for comfort and slip resistance.
• Safety Features: 600V overload protection with visual and audible warnings.

2. Safety Information

Always prioritize safety when working with electrical equipment. This device is designed with safety in mind, but proper usage is crucial to prevent injury or damage.

• Overload Protection: The meter features 600V overload protection. If AC/DC voltage exceeds 600V, the LCD backlight will turn red and an audible buzzer will activate to warn you.
• Current Measurement: When using the clamp to measure current, ensure you clamp around a single live wire, not the entire power cable, to obtain accurate readings and prevent damage.
• Insulation: The dual-color molded housing provides superior comfort and slip resistance, enhancing safety during use.
• Battery Safety: Use only the specified battery type (2 x 1.5V AAA). Do not mix old and new batteries or different types.

3. Setup

3.1. Battery Installation

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

3.2. Connecting Test Leads

For voltage, resistance, capacitance, diode, continuity, and frequency measurements, connect the included test leads:

• Insert the red test lead into the 'INPUT' jack.
• Insert the black test lead into the 'COM' jack.

3.3. Connecting Thermocouple

For temperature measurements, connect the included thermocouple:

• Insert the thermocouple's banana plugs into the 'INPUT' (red) and 'COM' (black) jacks.

4.1. Power On/Off and Display Features

• Turn the function knob to the desired measurement mode to power on the device. Turn to 'OFF' to power off.
• Backlight: Press the 'SEL' button briefly to toggle the backlight on/off for the large LCD display.
• Flashlight: Press and hold the 'HOLD' button to activate the built-in flashlight, useful in dark environments.
• Data Hold: Briefly press the 'HOLD' button to freeze the current reading on the display. Press again to release.
• Max/Min: Press the 'MIN/MAX' button to record the maximum or minimum values during a measurement.
• Auto Shut-off: The meter will automatically shut off after approximately 15 minutes of inactivity to conserve battery life.

4.2. Current Measurement (AC/DC)

1. Turn the function knob to the 'A~' (AC Current) or 'A=' (DC Current) position.
2. Open the clamp jaw by pressing the clamp trigger.
3. Enclose only a single live conductor within the clamp jaw. Ensure the jaw is fully closed.
4. Read the current value on the display.
5. For DC current measurement, press the 'ZERO' button to clear any residual readings before testing.

4.3. Voltage Measurement (AC/DC)

1. Turn the function knob to the 'V~' (AC Voltage) or 'V=' (DC Voltage) position. The meter supports auto-ranging.
2. Connect the red test lead to the positive (+) point and the black test lead to the negative (-) or common point of the circuit.
3. Read the voltage value on the display.
4. The meter also features an 'AUTO-V LoZ' mode for automatic recognition of AC/DC voltage with low input impedance, providing higher accuracy.