HIOKI CM3286-50 AC Clamp Power Meter

A. Product Overview

The HIOKI CM3286-50 combines the convenience of a clamp meter with detailed electrical power measurement functions. It allows technicians to measure electrical parameters directly on live circuits without disconnecting the current carrying conductor.

The instrument can measure:

• AC voltage
• AC current
• Active power
• Reactive power
• Apparent power
• Power factor
• Phase angle
• Frequency
• Voltage and current peak values
• Simple active energy consumption
• Phase sequence
• Maximum, minimum and average values

It supports single phase 2 wire, single phase 3 wire, balanced three phase 3 wire and balanced three phase 4 wire systems. For three phase measurements, the meter can calculate estimated power values.

The CM3286-50 can display up to four related parameters simultaneously. It also includes an Auto Hold function, connection guidance for three phase circuits and warning indications using both sound and a red backlight.

B. Working Principle

The HIOKI CM3286-50 measures current through its clamp sensor. The clamp is placed around a single conductor, allowing the instrument to detect the magnetic field produced by AC current flowing through that conductor.

Voltage is measured using the connected voltage leads.

Using the measured voltage and current values, along with their phase relationship, the meter calculates electrical parameters such as:

Active Power: Actual power consumed by the load.

Reactive Power: Power associated with inductive and capacitive loads.

Apparent Power: Combination of active and reactive power.

Power Factor: Ratio between active power and apparent power.

Phase Angle: Angular difference between voltage and current.

Because the CM3286-50 uses True RMS measurement, it can accurately measure AC voltage and current even when the waveform is not a perfect sine wave.

When the optional Z3210 Wireless Adapter is installed, measured data can also be transferred to a smartphone or tablet through Bluetooth and analyzed using HIOKI GENNECT Cross.

C. Why It Is Used

The HIOKI CM3286-50 is used when technicians need to quickly check electrical power conditions without installing a large power analyzer.

Typical applications include:

• Checking voltage and current on electrical circuits
• Measuring active, reactive and apparent power
• Checking power factor
• Checking phase angle
• Detecting phase sequence in three phase systems
• Measuring power consumption
• Checking electrical load conditions
• Investigating abnormal power fluctuations
• Checking unbalanced three phase loads
• Electrical maintenance and troubleshooting
• Detecting electricity theft and meter tampering
• Comparing electricity meter readings with actual measured power
• Basic harmonic investigation when used with Z3210 and GENNECT Cross

The CM3286-50 can display MAX, MIN, AVG and PEAK values, making it useful when checking variations in electrical supply conditions.

Hioki also specifically positions this model for detecting electricity theft by comparing electric meter readings with actual measurements or by measuring current on the supply side of an unauthorized connection.

D. Suitable Buyers

The HIOKI CM3286-50 is suitable for:

• Electrical maintenance engineers
• Industrial maintenance teams
• Electrical contractors
• Facility management companies
• Energy auditors
• Electrical testing professionals
• Factory maintenance departments
• Utility service engineers
• Electrical panel manufacturers
• HVAC maintenance teams
• Building maintenance technicians
• Power distribution maintenance personnel
• Electrical inspection companies
• Energy management professionals
• Electrical troubleshooting technicians
• Professionals investigating electricity theft or meter tampering

Frequently Asked Questions

What is the HIOKI CM3286-50?

The HIOKI CM3286-50 is a portable AC clamp power meter designed to measure current, voltage, active power, reactive power, apparent power, power factor, phase angle, frequency and other electrical parameters.

What is the current measurement range of the CM3286-50?

The instrument measures AC current from 0.060 A to 600.0 A.

What voltage range can the HIOKI CM3286-50 measure?

The specified AC voltage measurement range is 80.0 V to 600.0 V.

What is the power measurement range?

For single phase measurement, the CM3286-50 measures approximately 0.005 kW to 360.0 kW. It also supports higher calculated power ranges for balanced three phase systems.

Can the CM3286-50 measure three phase power?

Yes. It supports balanced three phase 3 wire and balanced three phase 4 wire circuits. Three phase power values are calculated as estimated values based on the measurements.

Can it measure unbalanced three phase power?

Yes. For a three phase 3 wire system, the CM3286-50 can measure single phase power twice and automatically add the results. Three phase 4 wire circuits can be checked using three separate measurements.

Does the CM3286-50 measure power factor?

Yes. It can measure power factor from minus 1.000 to 1.000.

Can it detect phase sequence?

Yes. The HIOKI CM3286-50 includes phase sequence detection for three phase power lines.

Does it support harmonic measurement?

Yes, when the optional HIOKI Z3210 Wireless Adapter and GENNECT Cross are used. Voltage and current harmonics can be analyzed from the 1st to the 30th order.

Does the HIOKI CM3286-50 have Bluetooth?

Bluetooth communication is available when the optional HIOKI Z3210 Wireless Adapter is installed.

What is GENNECT Cross?

GENNECT Cross is HIOKI's mobile application that allows compatible instruments to transfer measurement results to smartphones or tablets, manage readings, add photos and notes, and generate reports.

Can measurement data be transferred directly to Excel?

Yes. When the Z3210 Wireless Adapter is used, the CM3286-50 supports direct measurement data transfer into Excel templates through the supported HIOKI workflow.

Can the CM3286-50 detect electricity theft?

Yes. HIOKI specifically lists electricity theft and meter tampering detection as applications for this instrument. It can compare meter readings with actual measurements and check current on the power supply side of an unauthorized connection.

What is the clamp jaw diameter?

The HIOKI CM3286-50 has a maximum core jaw diameter of approximately 46 mm.

Can it measure currents higher than 600 A?

With the optional HIOKI 9290-10 Clamp On Adapter, measurements of up to 1000 A AC are supported, with up to 1500 A possible for limited duration according to HIOKI specifications.

Where is the HIOKI CM3286-50 commonly used?

It is suitable for factories, commercial buildings, electrical distribution systems, industrial machinery, utility maintenance, electrical inspection, energy monitoring and field troubleshooting applications.