Digital Phase Rotation Meter with Three-Phase Voltage Measurement Functionality
Hioki’s non-contact voltage detection and measurement technology places
efficiency and safety as priority considerations with the goal of
protecting customers that need to conduct on-site electrical work
as part of renovations and expansions of manufacturing plants and
buildings. The PD3259 Digital Phase Detector lets you to measure
three-phase voltage and detect phase sequence simultaneously by just
clipping onto covered cables, ensuring absolutely no contact with
metal parts for maximum safety.

Model No. (Order Code)



A comment of Good Design Award 2016
“I was impressed by Hioki’s commercialization of no-metal-contact
voltage measurement technology, which not only eliminates the
risk of electric shock while performing electrical work in the
field, but also contributes greatly to reducing workload, both
psychologically and in terms of man-hours required to complete
a task. In addition, the product’s size and interface are well
considered in light of a basic design that differs from past
products due to the use of no-contact technology.”

CAT IV 600 V

Key Features

• World’s first non-metallic contact voltage detection and testing
• Simply clip onto wire insulation
• Phase detection check and line-to-line voltage inspection at the same time
• Easy and intuitive phase detection check with backlight and buzzer
• Ideal for work certification photos, offering simultaneous display of phase sequence and 3-phase voltage

Note: Only the voltage value is displayed when measuring a single-phase/3-wire circuit.

How to Use the Hioki Digital Phase Detector PD3259

In the past, four steps have been necessary in order to check a 3-phase
power circuit: one set of measurements to check the phases with a phase
detector, and three line-voltage measurements (one for each phase) made
with a tester. The Digital Phase Detector PD3259 replaces this process
with a single, no-metal-contact measurement step that can be made simply
by affixing three clamp sensors. The instrument quickly displays the
phase detection results and three phase voltage values.

*This video depicts measurement of a 3-phase power circuit in Japan.
The instrument can also be used to measure power circuits in other
countries, for example 3-phase/4-wire circuits.

Phase detector + tester functionality: At-a-glance, no-metal-contact phase detection and line voltage measurement in 3-phase circuits

With the PD3259, you can check both phase order and line voltages simply
by clipping the sensors to the outside of the circuit’s insulated wires.
No-metal-contact measurement means maximum safety.

Simultaneous display of phase order, ground phase, and 3-phase voltage values

Phase order, ground phase, and 3-phase voltage values are displayed at the
same time on a large, easy-to-see display that can be used as-is to
create photographs to document electrical installations.

Easy-to-understand visual and aural communication of judgment results

The PD3259 indicates phase order (normal/reversed) judgment results
via the color of its backlight and a beeping sound.

[Normal phase order]
Backlight: Green
Beeping: Intermittent tone

[Reversed phase order]
Backlight: Red
Beeping: Continuous tone

Basic specifications (Accuracy guaranteed for 1 year, Post-adjustment accuracy guaranteed for 1 year)

Detection functionsPositive phase, negative phase (Three-phase 3-wire, Three-phase 4-wire), open phase, prediction of ground phase (Three-phase 3-wire)
Measurement parametersThree-phase AC voltage (line-to-line voltage and voltage to ground), Frequency
• Voltage measurement accuracy: ±2.0% rdg. ±8 dgt.,
• Frequency measurement accuracy: ±0.5% rdg. ±1 dgt.,
• Response time: 3 s or less, Display update rate: 500 ms
Measurement targetsCovered cables, Metal portions *Use on shielded cables not supported
Three-phase 90.0 to 520.0 V AC (45 to 66 Hz)
Diameter of measurable conductorsFinished outer diameter: 6 to 30 mm (0.24 to 1.18 in)
Maximum rated voltage to earth600 V AC (CAT IV)
Environmental protectionMain unit (excluding voltage sensors): IP54 (EN60529) dustproof and waterproof
Other functionsHold function, Backlight, Buzzer, Auto power-off, Low battery warning, Drop proof (on concrete, 1 m/ 1 time)
Power supplyAA alkaline batteries (LR6) ×4, Maximum rated power: 3 VA, Continuous operating time: 5 hours (Backlight off, standby state)
Dimensions and mass84 mm (3.31 in)W × 146 mm (5.75 in)H × 46 mm (1.81 in)D, 590 g (20.8 oz, including batteries), cord length: 0.5 m (1.64 ft)
AccessoriesAA alkaline batteries (LR6) ×4, Instruction manual ×1, Carrying case C0203 ×1, Spiral tubes (black ×1, red ×2, blue ×2, yellow ×2)
Catalog: DIGITAL PHASE DETECTOR PD3259Download PDF  [1MB]English

For more information, click here