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 PD3259-50 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. CAT IV 600 V Key Features • Easily transfer measurement data to your smartphone or tablet by using our free app GENNECT Cross or to an Excel® file. (Wireless Adapter Z3210 is necessary) • Available to check the disequilibrium rate and vector diagram in our free app GENNECT Cross (Upgrade in 2021) • 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.

Model No. (Order Code)

PD3259-50 Wireless Adapter Z3210 not included
PD3259-90 Bundled with the Wireless Adapter Z3210

When Z3210 is installed

Wireless support Wireless communication capability for even greater convenience than PD3259 (legacy model)

Compatible with Wireless Adapter Z3210. When the wireless adapter Z3210 is attached to the instrument, you can use Bluetooth® wireless communication. By using the free app GENNECT Cross, you can check the measurement value, manage the data and create the report on smartphones and tablets easily.

For more information on the Z3210, click here.

Easy! Just connect the optional Z3210 Wireless Adapter to your Hioki compatible instrument, to make it Bluetooth® ready.

Wirelessly connect Hioki-compliant instruments with a simple connection. Transfer measured values to your tablet or smartphone.

For more information on the Z3210, click here.

Instantly create reports by a free app (GENNECT Cross)

GENNECT Cross, a free app designed specifically for use with Hioki measuring instruments, lets you check and manage measurement results and create reports. The software provides a range of functionality that helps manage data in the field, including photographing measurement sites, placing measurement results on photographs, and saving hand written memos. (Wireless Adapter Z3210 is necessary) Can check the unbalance rate and vector diagram from the measurement data of PD3259-50. This is a reference image of the planned completion.

Click here for details about GENNECT Cross

Easily transfer measurement data to an Excel® file: Excel® Direct Input Function

Excel® Direct Input function allows you to input measurement values directly and automatically into an Excel® file once the instrument's auto-hold function is activated. (Wireless Adapter Z3210 is necessary)

Just clip the wire

The measurement can be taken simply by cliping the wire.

Safe measurement without contact with metal

There is no metal exposure on the sensor. You can measure safely without touching metal.

Display on a large screen

Phase detection check and line-to-line voltage inspection at the same time.

Light and sound notification

A red light and a continuous buzzer sounds to indicate the Negative phase. You can switch screens and check the frequency.

Place the instrument to the wall

The Magnetic Strap Z5020 (optional) can be used to hang and fix the instrument to the wall.

Color clips are included to help identify the code

How to Use the Hioki Digital Phase Detector PD3259-50

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 PD3259-50 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.

Basic specifications (Accuracy guaranteed for 1 year, Post-adjustment accuracy guaranteed for 1 year)
Note: Multi-core cables, thick cables, and dirty cables may not be measured accurately.

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, Without Z3210)
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, Color clip (White ×2, red ×2, blue ×2, yellow ×2), Spiral tubes (black ×1)

Log into your myHioki account to access more technical documents and information where available.

Seminar Videos On Demand

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Seminar Schedule

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Catalog: WIRELESS ADAPTER Z3210 Download PDF  [1MB] English
Catalog: PHASE DETECTOR,VOLTAGE DETECTOR Series Download PDF  [2MB] English

User Guides

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If you can not download, log into your myHioki account to access more technical documents and information where available.

Instruction Manual English
Instruction Manual Korean
Instruction Manual Simplified Chinese

Outline Drawings

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Technical Notes

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Declaration of Conformity


Drivers, Firmware

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• Increase your work efficiency, by eliminating human errors from manual reporting • Transfer readings on instruments to easy-to-read graphical reports to prove integrity • Compliance with wireless regulations in more than 50 countries and regions

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Extra strength

Connect to your smartphone or tablet


• Mobile app for iOS, Android • Improve efficiency of operations that repeat measurement and recording • Analyze correlated data during issues and generate quick reports

Learn more

Bundled Accessory




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