HIOKI CM4373-90 - AC/DC True RMS Clamp Multimeter with 2000 A Current Range

Key Specifications

Detailed Product Overview

The HIOKI CM4373-90 Clamp Multimeter is the right choice for professionals who need safe and precise measurement of very large AC/DC currents. As a set consisting of the HIOKI CM4373-50 and the included Z3210 Bluetooth Adapter, it combines a 2000 A range, True RMS accuracy, and wireless capability for industrial power distribution, heavy machinery, and EV charging systems. Its 55 mm jaws accommodate large diameter insulated conductors, enabling reliable measurement in applications where smaller clamp meters may not fit. 

Voltage measurement up to 1000 V AC/DC covers most requirements. When paired with the optional P2010 High Voltage Probe, the instrument can measure up to 2000 V DC in CAT III environments, enabling safe testing of photovoltaic strings and high voltage batteries. True RMS technology ensures accurate results even with distorted waveforms.

Versatile multimeter functions

Beyond current and voltage, the HIOKI CM4373-90 also functions as a versatile multimeter: it measures resistance, capacitance, continuity, diode polarity check, and DC power. This is particularly helpful when checking DC loads and power conditions in photovoltaic systems, battery applications, and industrial DC circuits. The temperature function can be used with a K thermocouple such as the optional DT4910 Thermocouple (K), making it possible to measure from -40 °C to 400 °C on site. It also supports non contact voltage detection for a quick check for the presence of AC voltage, which is useful for an initial check at the measurement point but does not replace voltage measurement with test leads. Automatic AC/DC detection and advanced display options such as Max/Min/Avg, PEAK values, filter function, manual/auto hold, and pass/fail judgement simplify daily tasks and save time. 

The included L9300 test leads are designed with the user in mind. Their slide type mechanism allows the metal tips to be extended or retracted, making removable caps and the risk of losing them a thing of the past. This simplifies handling and enables a safe switch between short tips for higher CAT ratings and fully extended tips for tight measurement points. The display backlight makes readings easier in poorly lit distribution boards, control cabinets, and service environments. An operating temperature range of -25 °C to 65 °C allows use under demanding site conditions, from unheated installations to hot industrial environments. 

Bluetooth and safety ratings

With the included Z3210 Bluetooth Adapter, measured values can be transferred wirelessly to a smartphone or tablet. In the free GENNECT Cross app for Android and iOS, values can be stored, documented, and assigned to individual measurement locations. Even when the instrument display is difficult to access at the measurement point, live values can be viewed directly on the mobile device. The app also supports current waveform display, which helps with troubleshooting under changing load conditions and in industrial installations. In addition, the Z3210 supports HID functionality for direct transfer of measured values into Excel or other applications.

The CM4373-90 complies with CAT IV 600 V / CAT III 1000 V, and with the P2010 it also supports CAT III 2000 V. Its rugged housing is rated IP54 for dust and splash resistance, ensuring safe operation on construction sites and in harsh outdoor conditions.

Designed and manufactured in Japan

HIOKI has been developing clamp meters, clamp multimeters, current sensors and current clamps for decades and manufactures them at its own factories in Nagano Prefecture, Japan. The CM4373-90 stands for precise measurements, durable workmanship and a level of quality that becomes immediately clear during service work on large conductors.