GAOTek Phase Meter with Wire Examination (Phase Detection)

This Phase Meter with Wire Examination is a multi- functional instrument which provides detection of phase sequence, live wire examination, simple power detection and also helps in break location detection.




GAOTek  Phase Meter with Wire Examination is a highly reliable instrument to perform phase sequence detection, live wire examination, simple power detection, FireWire identification, phase deficiency determination, break location detection, DC line break and line maintenance. The test can be performed by non-contact measurement where the three-phase insulating sheath is clamped directly to the three super-sensitive highly insulated clamps. It is composed of a magnetic base plate which eases the operations.


  • Reliable and Convenient to use
  • Pollution level 2, CAT Ⅲ (600 V), Transient over-voltage 6000 V
  • Battery life of 200 hours
  • Intuitive and clear LED dynamic display
  • Ultra- low power consumption
  • Performs multiple functionalities
  • Boot indication
  • Automatic power off after 3 minutes of idle time

Technical Specifications

Power supply DC 3 V AA Mn batteries (R6P) × 2 PCS. Can perform continuously for 200 Hours
Live voltage range AC 70 ~ 1000 V, 45 Hz ~ 65 Hz (Sine Wave Continuous Input)
Clamp wire size Diameter ø 0.06 – ø 0.6 in (ø1.6-ø16 mm)
LED display [Positive Phase Sequence] The Four Phase-Sequence Lamps Blink in Order (Clockwise)

[Negative Phase Sequence ] The Four Phase-Sequence Lamps Blink in Order (Counter-clockwise)

[Live-Voltage Indication] L1, L2, L3 Lamps Light Up

[Default Phase] L1/L2/L3 Lamp is Off

[Open Circuit] L1/L2/L3 Lamp is Off

Meter dimension Width× Height × Thickness: 2.7 in ×  2.9 in × 1.1 in    (70 mm × 75 mm × 30 mm)
Clamp lead length 1.9 Ft (0.6 m)
Meter weight 0.4 lbs (0.2 Kg) (With Battery)
Working temperature and humidity 14 °F ~ 131 °F (-10 °C~55 °C); Below 80 % RH
Storage temperature and humidity -4 °F ~ 140 °F (-20 °C ~ 60 °C); below 90% RH
Maximum measured voltage AC 1000 V
Dielectric strength 5.4 kV rms
Maximum rated power 300 mVA

Additional Information


  • Pay special attention to safety under any circumstance while using the instrument
  • Take note of the label text and symbols on the panel and back of the instrument
  • Check the instrument, lead wire and clamps. Make sure no damage is caused to the instrument
  • Please don’t touch an exposed wire during measurement
  • Keep the clamp clean and maintain it regularly
  • Please don’t place and store the instrument in a place with high temperature, humidity, moisture condensation and direct sunlight for a long time
  • Remove or replace the battery if you expect not to use the instrument for a long time
  • Take note of the polarity when replacing the battery. Move the clamps away from the wires and replace the batteries
  • The operation, demolition, calibration and maintenance of the instrument must be carried out by qualified personnel authorized to do so
  • The meter should be stopped from being used immediately and sealed if any danger is caused in case of continued use; Only a competent body can be authorized to deal with it
  • ” in the manual is the safety warning sign. The contents of the manual must be followed for safe operation
  • ” is the other safety signs. The contents of the manual must be followed for safe operation

Electrical Symbols

Extremely dangerous! The operator must strictly abide by the safety rules; otherwise there is risk of electric shock, resulting in injury or fatalities
Warning! Safety rules must be strictly abided by, otherwise personal injury or equipment damage may be caused
Alternate Current(AC)
Direct Current(DC)
Double Insulation


Model Diameter of wires can be clamped
GT00Y900ZX ø 0.06 in – ø 0.6 in

Instrument Structure

  1. Operation indicating panel
  2. Clamps
  3. Lead Wire
  4. Instrument body
  5. L1 indicator lamp
  6. L2 indicator lamp
  7. L1 indicator lamp
  8. Phase sequence indicator lamp (4 lamps)
  9. Battery, voltage indicator lamp
  10. Power on indicator lamp
  11. ON power key
  12. OFF power key
  13. Connecting screws
  14. Magnet
  15. Battery cover board

Method of Operation

  1. Phase sequence detection
    1. Connection: Clamp three phase wires with the three clamps respectively and arbitrarily (Shown in Fig-1)
    2. Put the wires at the position marked with (Shown in Fig-2)

    1. Press the red ON power key, the power indicator lamp lights up. If the lamp can’t light up, it indicates that the battery has low power or check the instrument. In this case, please change the batteries or repair the instrument
    2. If the 4 phase sequence indicator lamps light up in clockwise order and the buzzer sounds intermittently, it is positive phase sequence L1-L2-L3 (U-V-W) (Shown in Fig-3). If the 4 phase sequence indicator lamps light up in counter-clockwise order, and the buzzer sounds continuously, it is negative phase sequence L3-L2-L1 (W-V-U).

    1. Press white OFF power key, the power will be turned off automatically if the instrument remains idle for 5 minutes after the device is turned on to reduce power consumption.
  1. Live wire examination, power inspection
    1. Clamp one wire with any one clamp, if it is an electrified wire (AC 70 – 1000 V), then L1/U, L2/V or L3/W lamps will light up to check whether the wire is electrified
    2. Clamps and lamps corresponding table:
Clamp used Lamp to light up
L1/U (Yellow) L1/U lamp only
L2/V (Green) L2/V lamp only
L3/W (Red) L3/W lamp only
  1. Phase deficiency judgment, breakpoints finding, breakpoints positioning
    1. Clamp three phase wires with one clamp, in turn if there is a phase deficiency, L1, L2 or L3 lamps won’t light up
    2. Clamp one wire with any one clamp and move the clamp along the wire. If the L1, L2 or L3 lamps won’t light up, it means the section wire before this point has a break. Shorten the range of detection to find out the breakpoints accurately. It is a convenient and safe method for wire maintenance.

Battery Replacement

Pay attention to the polarity of batteries!

  1. Make sure the clamps are moved away from wires before replacing the batteries for measurement
  2. Turn OFF the power (Figure A)
  3. Loosen the screw and then remove the battery cover (Figure B)
  4. Replace the batteries with new ones (Figure C)
  5. Put the battery cover back in place and tighten the screw (Figure D)
  6. Turn ON the power to check whether the batteries are successfully replaced, repeat step 2 if it does not work

Trouble shooting

Symptoms Possible Causes Remedies
Cannot power on (LED power indicator lamp is off, without any display) No batteries Set the batteries
Wrong battery type Replace with right type
Insufficient capacity of battery Replace the batteries
Faulty battery polarity Install batteries in correct polarity
Poor contact of battery contacts Replace the battery contacts
Battery cover not completely covered Cover it again
Defect of circuit component Repair or replace the PCB
LED dim display Insufficient capacity of battery Replace the batteries
Incapable of measurement The three phase wires

are not electrified

Does not belong to instrument faults
Failed to clamp the wire Clamp again referring to the manual
Lead wire break Change the lead wire
Defect of circuit component Repair or replace the PCB

Assembly Details


Main Unit 1 piece
Box 1 piece
Strap 1 piece
5# manganese alloy batteries (R6P) 2 piece
Manual 1 copy
Guarantee Card 1 copy
Certification 1 copy