Professional Electrical Diagnostics: MESTEK CM87A / CM87B / CM87C 600A True-RMS Digital Clamp Meter Series in Malaysia

For plant electricians, commercial HVAC service technicians, industrial automation engineers, and facility maintenance managers across Malaysia, dependable 600A current clamp instruments are vital for routine inspections and emergency electrical troubleshooting. MTM Precision is proud to introduce the MESTEK CM87A, CM87B, and CM87C 600A TRUE-RMS Digital Clamp Meter Series—a family of heavy-duty, high-precision diagnostic meters built to perform reliably in demanding commercial and industrial environments.

Compliant with EN61010-2-032 safety standards and rated to CAT III 600V, the MESTEK CM87 series combines a large 42mm jaw capacity, 6000 Counts display resolution, True-RMS signal analysis, VFD variable frequency drive filtering, motor Inrush current measurement, non-contact AC voltage (NCV) detection, and thermocouple temperature auditing in a durable 450g housing.

🌟 Key Features & Industrial Capabilities

Large 42mm Jaw Opening: Generous clamp jaw opening diameter accommodates heavy industrial feeders, large copper conductors, and parallel wire runs effortlessly.
True-RMS Processing & 6000 Counts Display: Delivers precise AC voltage and current readings even on non-linear or distorted waveforms caused by variable frequency drives, switching power supplies, and electronic loads.
VFD (Variable Frequency Drive) Filtering Mode: Filters out high-frequency pulse-width modulation (PWM) noise and electrical harmonics, ensuring clean, true readings when troubleshooting inverter-driven motors and pumps.
Inrush Current Measurement for Motor Startup (CM87C): Captures high transient surge currents when electric motors, air conditioning compressors, or heavy inductive machinery start up, helping diagnose breaker trip causes.
600A AC/DC Measurement Flexibility: Choose between cost-effective AC current testing (CM87A / CM87B) or full AC/DC current testing up to 600A (CM87C) for battery banks and DC power systems.
K-Type Thermocouple Temperature Testing (CM87B & CM87C): Integrated temperature input supporting -20°C to 1000°C (-4°F to 1832°F) for rapid thermal checks on breaker terminals, electrical contacts, and HVAC refrigeration coils.
Non-Contact AC Voltage Detection (NCV): Safely detect live AC voltage presence through wire insulation and conduit enclosures without metallic contact.
Integrated LED Flashlight & Backlit Display: Provides bright illumination for dark electrical panels, ceiling spaces, and subterranean cable vaults.

📊 Detailed Model Comparison & Technical Specifications

The MESTEK CM87 Series offers three specialized model variations engineered to fit basic electrical, thermal diagnostic, and complete AC/DC motor testing needs:

Measurement Parameter	CM87A (AC Current)	CM87B (AC + Temp)	CM87C (AC/DC + Inrush + Temp)	Measurement Accuracy
DC Voltage	600mV / 6V / 60V / 600V	600mV / 6V / 60V / 600V	600mV / 6V / 60V / 600V	± (0.8% + 3)
AC Voltage	6V / 60V / 600V	6V / 60V / 600V	6V / 60V / 600V	± (1.0% + 5)
DC Current	—	—	60A / 600A	± (2.5% + 10)
AC Current	400A / 600A	60A / 600A	60A / 600A	± (2.5% + 10)
Inrush Current	—	—	600A Peak	Motor Startup Transient
Resistance	400Ω / 4kΩ / 40kΩ / 400kΩ / 4MΩ / 40MΩ	600Ω / 6kΩ / 60kΩ / 600kΩ / 6MΩ / 60MΩ	600Ω / 6kΩ / 60kΩ / 600kΩ / 6MΩ / 60MΩ	± (2.0% + 5)
Capacitance	400nF / 4uF / 40uF / 400uF / 4mF	600nF / 6uF / 60uF / 600uF / 6mF / 60mF	600nF / 6uF / 60uF / 600uF / 6mF / 60mF	± (5.0% + 10)
K-Type Temperature	—	-20°C to 1000°C (-4°F to 1832°F)	-20°C to 1000°C (-4°F to 1832°F)	± (2.0% + 2)

⚙️ Functional Features & General Hardware Specifications

Feature Overview:

Feature Metric	CM87A	CM87B	CM87C
Display Counts	6000 Counts	6000 Counts	6000 Counts
Jaw Opening Diameter	Φ 42 mm	Φ 42 mm	Φ 42 mm
True-RMS Technology	Yes	Yes	Yes
VFD Filtering Mode	Yes	Yes	Yes
Continuity Buzzer	Sound Alarm (< 30Ω)	Sound Alarm (< 30Ω)	Sound Alarm (< 30Ω)
Data Hold & Backlight	Yes	Yes	Yes
LED Flashlight	Yes	Yes	Yes
NCV Detection	Yes	Yes	Yes
Input Impedance	1 MΩ	1 MΩ	1 MΩ
Low Battery Indication	Active below 2.4V	Active below 2.4V	Active below 2.4V

Hardware Specifications:

Power Battery Requirements: 2 x 1.5V AAA Batteries
Physical Unit Dimensions: 254 mm x 92 mm x 45 mm
Unit Weight: Approximately 450 g (Heavy-duty protective design)
Safety Compliance Rating: EN61010-2-032, CAT III 600V
Included Standard Accessories: Clamp Meter Unit, Heavy-Duty Test Leads, K-type Thermocouple Probe (CM87B/CM87C), Carrying Case, AAA Batteries, User Manual, Color Box

🏭 Primary Application Fields in Malaysia

Industrial Plant Maintenance: Routine load monitoring on 3-phase feeder cables, motor control centers (MCC), and distribution panels up to 600A.
Commercial HVAC & Refrigeration Services: Compressor current testing, motor inrush current analysis (CM87C), capacitor checking, and temperature auditing.
Variable Frequency Drive (VFD) Diagnostics: Clean AC voltage and current measurement on inverter-driven pumps, ventilation fans, and conveyor drives using VFD mode.
Solar PV & DC Battery Systems (CM87C): DC current measurement on solar string outputs, battery storage systems, and industrial DC power supplies.

📞 Contact & Purchasing Information in Malaysia

For product inquiries, bulk sales, technical support, or official quotations regarding MESTEK measurement instruments in Malaysia, please contact MTM Precision:

Contact MTM Precision

MTM Precision Sdn. Bhd.

Showroom & Service Centre

No. 29-1 & 29-2, Jalan Bandar 18,

Pusat Bandar Puchong,

47160 Puchong, Selangor, Malaysia

Website: www.mtmpre.com.my

Email: mtmpre@yahoo.com

WhatsApp: +6016-660 7346

Office Tel: +603-80807172