Product Apr. 30, 2015

Hioki Launches Three Digital Multimeter Models

Lineup Lets Customers Select the Perfect DMM Based on Individual Needs

Nagano, Japan

Hioki s pleased to announce the launch of the Digital Multimeter DT4254, DT4255, and DT4256.

Developed and manufactured in the city of Ueda in Nagano Prefecture in an effort to bring products with made-in-Japan quality to customers around the world, the DT4200 series has been designed by Hioki to deliver exceptional ease of use and convenience in response to the fully array of customer needs.

In May 2013, Hioki launched the standard models in the DT4200 series—the DT4251, DT4252, and DT4253—for use in maintenance inspections of inverters, solar power systems, and electrical equipment in buildings and manufacturing plants. By adding the newly launched DT4254, DT4255, and DT4256 to the series, Hioki has expanded its line of digital multimeters so that customers can better choose the optimal product for each application.

1. Unprecedented measurement speed for higher measurement efficiency
The new instruments deliver the fastest response speed of any portable multimeter by completing AC voltage measurement in about 0.6 seconds and DC voltage measurement in about 0.7 seconds. They also provide exceptional noise resistance, enabling them to measure the output voltage on the secondary side of an inverter. These capabilities enable the instruments to output stable results immediately after the start of measurement.

In addition, the new instruments streamline measurement by simultaneously displaying the frequency during AC voltage measurement. Faster measurement times mean increased work efficiency for customers.

2. New function: DC voltage positive/negative polarity detection

When the instrument measures a negative voltage that is greater than -10 V, it notifies the operator with a red LED and beep, making it easy to check wiring at solar power system sites, in electrical rooms, and in other settings.

3. Drop-proof enclosure with a shock-resistant design

The new instruments are designed to withstand a 1-meter drop onto concrete without breaking.

4. Backlit screen to enable use in dim locations

The screen incorporates a white backlight so that measured values can be read accurately even in dim locations.

5. CAT-compliant design for a high level of safety
The new instruments comply with CAT IV (600 V) and CAT III (1000 V) measurement requirements. In addition, they deliver a high level of safety by incorporating a protective circuit to prevent electrical accidents in the event of erroneous operation or input.

The DT4254, which is designed exclusively for use in voltage measurement applications, prevents electrical accidents caused by erroneous operation, for example by attempting to measure voltage with the resistance range, by eliminating the root cause of such mistakes. The instrument can measure DC voltages of up to 1,700 V.

The design of the DT4255 reflects an overriding emphasis on safety by incorporating a fuse for voltage measurement terminals and a current-limiting resistor. Even if a short-circuit occurs inside the multimeter during voltage measurement, the current-limiting resistor will limit any short-circuit current while the fuse quickly disconnects the circuit, preventing a short-circuit accident.

Current measurement is performed using an optional clamp-on sensor.

The DT4256 delivers the most functionality of any of the three new instruments. This one instrument provides DC voltage measurement, AC voltage measurement, voltage measurement with DC/AC automatic detection, DC current measurement, AC current measurement, AC current measurement using a clamp-on sensor, continuity check, resistance measurement, diode check, capacitance measurement, and voltage detection functionality.

The instrument provides a 60.00 mA range for measuring DC currents, enabling it to measure 4 to 20 mA instrumentation signals output by transducers.

* Maintenance inspections of building and plant equipment
* Research and development work and maintenance inspections in the inverter, solar power, fuel cell, and electric vehicle fields
* Checking of electrical work


Established in 1935, HIOKI E.E. CORPORATION (TSE: 6866) has grown to become a world leader in providing consistent delivery of test and measuring instruments through advanced design, manufacturing, and sales and services. By offering over 200 main products characterized by safety and quality while meeting an expansive range of applications, we aim to contribute to the efficiency and value of our customers' work in research and development, production and electrical maintenance. HIOKI products and services are available around the world through our extensive network of subsidiaries and distributors. Information about HIOKI is available at

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DT4254 Digital Multimeter

DT428, DT425 and DT422 Series Digital Multimeters