Uni-T UT528AU Portable Appliance Tester (PAT)

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The UT528AU PAT tester from Uni-T is the NZ and AU version of the UT527/UT528 PAT testing machine that conducts tests on Class I and Class II appliances.


The UT528AU PAT tester from Uni-T is now available and configured to AS/NZS electrical standards. The UT528AU is the new version of the UT527/UT528 PAT testing machine that conducts tests on Class I and Class II appliances, as well as extension, leads using a separate test sequence. Using a simple three-button operation the Uni-T is easy to use and handy for individuals who would prefer a simple PAT instrument.

The Uni-T UT528AU carries out the basic required tests upon selection of the appliance type (Class I / Class II / Extension Lead) in an automatic test sequence and displays the readings and PASS/FAIL status at the end of the test. Aside from the basic test requirements the UT528AU PAT Tester also has the following features inbuilt:

  • Zero Earth Lead function: Used to zero out resistance built up within the earth test lead to avoid inflated Earth Bond readings as a result.
  • 250V Insulation Test option: In addition to the standard test voltage at 500V, a lower voltage of 250V can be selected. This is ideal when testing extension leads with surge protection.
  • 30m Long Lead Test: Activated when testing extension leads exceeding 30m in length. This increases the earth resistance allowance in accordance with guidelines for long extension leads.

The Uni-T UT528AU is capable of testing all standard appliances fitted with a 240V plug and all standard 240V 13A extension leads and IEC leads. Using a low test current exclusively at 200mA  the Uni-T UT528AU is also safe for testing any IT equipment.

The UT528 comes supplied in a hard plastic carry case that holds the instrument and accessories, The kit also includes an earth bond lead with probe and clip, 230V extension lead adaptor, earth nulling adaptor, 6 x C cell batteries and instruction manual.


  • Battery-powered and lightweight
  • 3 button operation
  • New Zealand / Australian Plug Lead
  • Built-in mains socket connector
  • Inbuilt auto sequence tests
  • 250V/500V Insulation Test
  • Low current earth bond test – Safe for IT equipment
  • Setting inbuilt for long extension leads
  • Hard plastic case
  • Lead nulling function
  • Additional setting for extension leads over 30m
  • Supplied with 12 months warranty


1 X UT528AU Tester, hard plastic carry case, earth bond lead with probe and crocodile clip, earth nulling adaptor, 6 x C batteries, 240V NZ/AU lead adaptor, neck strap, English instruction manual, 12-month manufacturer warranty.


UT528AU  Tester
Basic Functions Measuring Range Best Accuracy Technical parameters
Insulation Resistance Measurement 0.20MΩ~19.99MΩ ±5%+2  Test Voltage 500V
Test Current(R=500KΩ):>1mA
Test Current Short Circuit  <3mA
Testing Class-I Appliance 0.00Ω~19.99Ω ±5%+2 Test Current >200mA ( R<2Ω )
Test Voltage 5v DC
Leaking Current Test 0.10~10.5mA ±5%+2 Test Voltage 50V rms,
Test Frequency 50HZ AC
Cord Test Correct Wiring √ GOOD
Open Circuit, Short Circuit,

Wiring Reversed

Phase Test Correct Wiring “LN√,LE √,NE√” AC220V±10% input
Faulty Earth “LN√,LE×,NE×”
Faulty Neutral “LN×,LE √,NE×
Special Functions
Auto Power Off
Low Battery
Power 1.5V Battery(R14 orLR14) x6
LCD Size 136*47mm
Body Color Red+Grey
Body Weight 970g
Body Size 210*178*90mm
Accessory NZ/AU3 Pins Power Cord, Power Plug Adaptor, Alligator Clip, Test Lead, Carrying Case


UT528AU Portable Appliance Tester English Manual