Description
Hioki DT4255 – Digital Multi Meter Standard Model

- ±0.3% DC V basic accuracy, wide 40 Hz to 1 kHz AC V frequency characteristics
- Maximum safety in the field by absolutely preventing short-circuit accidents with fused measurement terminals and current-limiting resistor
- Broad -10 (14°F) to 50°C (122°F) operating temperature range
- Low-pass filter (100 Hz/ 500 Hz) cuts high harmonics (when measuring inverter fundamental waveforms)
DMM with Fuse-protected Terminals Ideal for Harsh Work Environments
The DT4255 is a digital multimeter designed for maximum safety with voltage measurement terminals that are protected by a fuse.
The Hioki DT4200 Digital Multimeter Series consist of a complete lineup of 9 models ranging from professional to industrial to pocket meters, delivering a super fast response rate and safety features that take electrical testing to a higher level.
Field-Proven Strength and Usability DT4200 series
Robust design capable of withstanding a drop from a height of 1 m onto concrete
To test our products’ ability to withstand mechanical shock, we repeatedly drop them from a height of at least 1 m until they break. This drop-testing regime leads to more robust products by fostering a series of design improvements.
Preventing instrument failure by keeping out dust
If dust gets into the instrument’s enclosure, it can cause the device to fail. Since dust can get into the instrument especially easily through the gap around the rotary switch, the DT4200 series incorporates a dustproof part known as an O-ring where the rotary switch is mounted to improve the device’s dust resistance.
Fast, accurate measurement of the output voltage on the secondary side of an inverter
The DT series can accurately measure the voltage on the secondary side of an inverter, just like a power meter. Its low-pass filter rejects harmonic components so that the fundamental wave can be isolated and accurately measured.
True RMS measurement for accurate measurement of even distorted current waveforms
Current waveforms are often distorted, causing the average-value and true RMS measurement methods to yield different results. To obtain accurate readings, RMS measurement is indispensable.
Outstanding viewing angle so display is easy to read at an angle or even in a dim location
The DT4200 series features a display with a wide viewing angle and a backlight function so that it’s easy to read, even when you can’t view the screen from the front or when making measurements in a dim location.
Rotary switch that’s easy to operate even when wearing gloves
The DT4200’s rotary switch is designed to be easy to turn even when wearing thick work gloves, for example while working in hazardous measurement locations or harsh conditions.
Outstanding hands-free ease of use in the field when working with numerous measurement locations
It’s hard to carry out work tasks smoothly when you’re juggling a measuring instrument, probes, recording paper, and other supplies. Field concerns like these are resolved by the DT4200’s magnetic strap, auto-hold function, and ability to save results in its internal memory. These capabilities boost work efficiency and help reduce work times.
*The auto-hold function is available exclusively in high-end and standard models. The ability to save results in internal memory is available exclusively in high-end models.
Extensive selection of probe tips that you can choose based on the measurement location, improving ease of measurement
With the DT4200, you can choose the probe type that best suits your measurement location, making it possible to measure in areas that can’t be reached with conventional probes and busbars that you wish to clamp between probes.
*Compatible probe tips vary with the DMM model. Please see page 16. The optional Connection Cable L4930 is required in order to use the probes shown at the left.
Digital Multimeter designed for maximum safety with fuse-protected terminals
- Accepts an AC clamp sensor
- Voltage detection function

Thorough prevention of shortcircuit accidents
When using the resistance measurement function, a protective circuit functions to prevent a short-circuit accident in the event of erroneous operation such improperly supplying voltage input. Even if a short-circuit occurs inside the tester, a current-limiting resistor will limit any short-circuit current while a fast-blow fuse quickly and reliably disconnects the tester circuitry, preventing a short-circuit accident.

Clamp-on sensorbased current measurement eliminates the cause of accidents
Mistakenly measuring voltage using the current range may lead to a short-circuit. The DT4255 eliminates the root cause of such accidents by providing clamp-on sensorbased current measurement functionality instead of using conventional probes.

Measure output voltage on the secondary sides of inverters by eliminating harmonic components
Accurately measure the fundamental wave alone by eliminating harmonic components with the DMM’s low-pass filter function.

Measurement data can be downloaded to, reviewed on, and saved to a computer.
If you connect the DT4255 to a computer with the optional Communication Package DT4900-01, you can graph data stored in the instrument’s internal memory and display measurement results in real time on the computer. In addition, displayed measured values can be saved (in text format).
*The computer and multimeter are electrically isolated by means of optical communications so that data can be sent without concern for electrical hazards.

True RMS measurement for accurate measurement of even distorted current waveforms
Digital multimeters implement two types of measurement: mean-value measurement and true RMS measurement. The two methods yield significantly different measurement results for current waveforms, which are often distorted. For accurate measurement, it is necessary to use an instrument with true RMS capability.

Designed and manufactured in Japan to ensure high quality and guaranteed with a 3-year warranty for peace of mind
All development, design, and manufacturing processes for almost all Hioki digital multimeters are carried out at our Head Office in Nagano Prefecture. Some of the industry’s most advanced technological capabilities enable us to deliver products of the highest possible quality.

Safe measurement requires use of an instrument that suits the measurement location.
To ensure operators’ ability to use measuring instruments safely, IEC 61010 classifies the locations in which instruments are used into a series of safety-based measurement categories (ranging from CAT II to CAT IV). Using an instrument that does not satisfy the required safety level can lead to an electrical accident.

Multimeters Template | |
|---|---|
| Style | Hand-Held |
| Measures AC V | Yes |
| Measures DC V | Yes |
| Measures AC A | Yes Measures AC A With a clamp that has mV output, up to 1000A |
| Measures DC A | No |
| True RMS | Yes |
| Maximum Voltage AC | 1000 V |
| Maximum Voltage DC | 1000 V |
| Maximum Current AC | 1000 A Maximum Current AC Only with a compatible clamp that has mV output |
| Basic Accuracy V DC | ±0.3 %rdg. ±3 dgt. |
| Backlight | Yes |
| Manual/Autoranging | Auto-ranging |
| Decibels | No |
| Resistance | Yes |
| Frequency | Yes |
| Capacitance | Yes |
| Temperature | No |
| Diode Testing | Yes |
| CAT Rating | IV |
| CAT Voltage | 600 V |
| Intrinsically Safe | No |
| Peak Hold | Yes |
| Overload Protector | Yes |
| Kelvin 4-Wire Measurement Capability | No |
| Wireless Display | No |
| Data Hold | Yes |
| Low-Pass Filter | Yes |
Product General Attributes | |
| Unique Features | Voltage measurement terminal fuse function. When using the resistance measurement function, there is a protective circuit that prevents short-circuit accidents, such as when accidentally supplying a voltage. |
| Warranty | 2 YEARS |
| Safety Approval | CE |
| Product Height | 2.50 IN |
| Product Length | 8.50 IN |
| Product Width | 5.00 IN |
| HTS/Schedule B Number | 9030.31.0000 |
| ECCN Number | 3A992 |
| Calibration Included | |
| Battery Type | AAA |
| Power Supply Voltage | Battery Powered |
| Country of Origin | Japan |
| Shipping Height | 2.50 IN |
| Shipping Length | 8.50 IN |
| Shipping Width | 5.00 IN |



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