Unit UT527 User manual

P/N:110401104471X

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UT527 Operating Manual
Overview - UT527 Pat Tester
The UT527 is a handheld, battery powered PAT tester suitable for carrying out
electrical safety checks on:
●Class I Appliances
●Class II Appliances
●Testing IEC and Extension Leads
●Checking of Mains sockets.
●220V (士10%) Mains Outlet Wiring Test
Unpacking the Unit
Open the case and take out the PAT tester. Check the following items carefully to see
if any parts are missing or damaged. If you find any missing or damaged parts please
contact the supplier you bought the UT527 from.

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＊UT527MainUnit 1x
＊Operating Manual 1 x
＊Earth Bond Lead 1 x
＊Alligator Earth Bond Clip 1 x
＊EarthNullingBlock 1x
＊Neck strap 1x
＊IEC Lead 1 x
＊Batteries C Type R14 1.5V UM2 6 x
Safety Information
Warnings
Please be aware of the following warnings:
●Before using the unit and test leads inspect both items. Do not use the unit
or test leads if either is damaged (including if the case is broken or damaged) as
this could result in electrical shock.
●Replace the battery as soon as the battery indicator “ ”appears. A low

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battery, in the meter may produce inaccurate readings.
●Do not use or store the unit in an environment of high temperature, humidity,
flammable or an electromagnetic environment as damage and incorrect
readings may result.
●Do not use rechargeable batteries in the unit.
●If the tester requires repair or replacement please contact your local service
center.
Declaration of Conformity.
Uni-T manufacture this product and declare that this product conforms to the
following standards:
BS EN 61326: 1998
Electrical equipment for measurement, control and laboratory use
BS EN 61010-1:2001
Safety Requirements for electrical equipment for measurement, control, and
laboratory use – Part 1

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4mm banana test lead (CAT III 600V)
Alligator clip (CAT III 600V or CAT IV300V)
1. Product Layout – UT527
Diagram 1 and Diagram 2

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1. Class 1 test selected
2. Class 2 test selected
3. Cord test / IEC / Extension lead test selected
4. Mains socket test Live Neutral and Earth indicators
5. Check the connection – Ensure that the appliance is switched on before test
6. Earth test Pass / Fail indication
7. Insulation test Pass / Fail indication
8. Polarity Test - Cord test / IEC / Extension lead pass / fail indication
9. Overall Test Result Pass indicator
10. Overall Test Result Fail indicator
11. Warning symbol
12. Low Battery warning
13. Earth Bond Test Lead socket
14. IEC test socket and Mains testing IEC socket

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Front Panel Operation
1: Press +button, Power on / Power Off.
2: Press button, when testing a CLASS I Appliance.
3: Press button, when testing a CLASS II Appliance.
4: Press button when testing Cord / Extension Lead Test.

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Ⅵ. Before Testing - Zero the Earth Bond Test Lead
Press and hold the button for 5 seconds to Zero the earth bond reading
using the earth bond lead and the nulling adapter together in the front test socket.
This will Null the earth reading of the test lead and display a tick when complete. It
is good practice to do this once prior to carrying out testing.
The unit will automatically switch off after approximately 2 minutes if no any
buttons are pressed.
Testing a CLASS 1 Appliance
Plug the appliance into the UT527 panel main socket Plug the earth test lead
into the socket (13) on the UT527 end panel. Connect the earth crocodile clip to
an exposed metal part on the appliance as below.

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1. Earth / Protective conductor test
Press the Class 1 test button to start the test.
If the earth resistance measured is greater than 0.2 Ω, the meter will display “×”
Earth Cont with “ ” flashing which is a FAIL. If this occurs, re- check the
connections between the pin of the plug to the bodywork of the appliance and that
the crocodile clip is attached to clean earthed metalwork on the appliance; If all
connections are ok the appliance earth connection maybe faulty.

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The PASS mark for the earth bond test is 0.2 Ωfor a Class 1 appliance.
If the reading is less than 0.2 Ω, the meter will display “√” Earth Cont which is a
PASS.
The unit will then automatically attempt to proceed to the Insulation test.
Press the button to proceed to the insulation test.
2. Insulation Resistance Test
Before the unit carries out the insulation test the unit will attempt to check to
see if the appliance is in the on position.
If it detects that the appliance is in the on position it will automatically carry out
the Insulation test.
If it appears to the unit that the appliance power switch is not in the on
position the unit will display “Check Connections” and the “ ” will be
flashing;
If this happens press the key and the unit will continue to carry out the
insulation test.

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Please note. Most electronic appliances will have electronic ‘on / off’ switches
and even though they are switched on the “Check Connections” message will
still appear.
If the measured resistance is greater than 1MΩ, the meter will display
“√”Insulation as a PASS
If the insulation of the appliance is less than 1MΩ, it will display “×” Insulation
as a FAIL
Final Result
4. After the above tests are completed, the meter will indicate whether the
appliance has Passed or Failed the tests.
Notes: To interrupt a test press any other key whilst carrying out the tests.
Testing a CLASS 2 Appliance
Plug the appliance into the UT527 panel main socket. Plug the earth / insulation
test lead into the socket on the UT527 end panel. Connect the earth test probe to

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an exposed part on the appliance as in diagram 4.
To start a test on a Class 2 appliance press the button.
Class 2 pre-check
If the unit detects that the appliance appears to be Class 1 as it detects an
earth connection it will display Check Connection “Earth Cont” with a flashing
symbol and you will be prevented from carrying out the Class 2 test. Test
the appliance instead using the Class 1 test.

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Insulation Resistance Test – Class 2 Appliance
Before the unit carries out the insulation test the unit will attempt to check to
see if the appliance is in the on position.
If it detects that the appliance is in the on position it will automatically carry out
the Insulation test.
If it appears to the unit that the switch appliance power switch is not in the on
position the unit will display “Check Connections”
If this happens press the key and the unit will continue to carry out the
insulation test.
Please note. Most electronic appliances will have electronic ‘on / off’ switches
and even though they are switched on the “Check Connections” message will
still appear.
If the measured resistance is greater than 2 MΩ, the meter will display
“√”Insulation as a PASS

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If the insulation of the appliance is less than 2 MΩ, it will display “×” Insulation
as a FAIL
Final Result - Class 2
After the above tests are completed, the meter will indicate whether the
appliance has Passed or Failed the Class 2 test.
Testing an IEC Lead / Extension Lead / Cord Test
Plug the mains lead under test into the socket and the front panel mains socket on
the unit as Diagram 5

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To start the cord test press
1. Earth Bond Test
The unit will carry out an Earth Bond test in the same manner as a Class 1
appliance. The Pass mark for this test is 0.2 Ω
2. Insulation Test
The unit will then carry out an insulation test as previously discussed in the
manual. The PASS Mark for this test is 2 MΩ.
Please note: When testing Surge Protected Extension Leads this test may fail.
This is normal and a result of circuitry within the surge protection device.
3. Polarity Test
The polarity test is the final test to be carried out and will check that the cord
or extension is wired correctly. It will check for open circuit, short circuit or
Line / Neutral reversal.
If the Polarity is correct then the meter will display “√Polarity”
If the Polarity test detects a fault, the meter will display “× Polarity”

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4. Overall Result
After the above measurements are completed, the meter will indicate whether
the measured appliance is compliant with the requirements of Cord with
“PASS” or “FAIL”
Checking a mains power supply
The unit comes complete with a built in socket tester which will check to ensure
that the socket is wired correctly.
Connect an IEC lead to the mains socket and plug this into the back of the meter
as in Diagram 6.

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1）If the Live and Neutral in the socket wiring is reversed or there is a fault with the
protective earth connection this is indicated : “LN√, LE×, NE×”
2）If there is a fault with the Neutral connection this is indicated: “LN×, LE√, NE×”
3）If the mains socket wiring is correct the display will show “LN√, LE √, NE√”
Accuracy Specifications
Earth Continuity
Pass Limit 0.2 ohms
Accuracy ±0.03 ohms
Test Current Resistance ≤2 ohms: ≥200mA
Test Voltage 5V DC
Insulation Resistance
CLASS 1: 1M ohms
CLASS 2: 2M ohms
Pass Limit
CORD: 2M ohms
Accuracy ±0.1M ohms
Test Voltage 500V
Test Current 500k:﹥1mA
1K: ﹤2 mA

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Factory default Pass / Fail limits
Class 1 Class 2 Cord
Earth Continuity 0.2ohms N/A 0.2ohm
Insulation Resistance 1.0Mohms 2.0 Mohms 2.0 Mohms
Cord Size /Current Rating
Length 0.5 mm /(3A) 1.0mm /(10A) 1.25mm /(13A)5m
5m 0.02 0.10 0.10
10m 0.40 0.20 0.20
25m 1.00 0.50 0.40
Table1
Table 1: Approximate resistance of protective earth conductors in cables
Maintenance
Battery Replacement
When the low battery symbol “ ”appears, replace the batteries as follows
1) Disconnect all test leads before battery replacement.
2) Power off the unit.

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3) Unscrew the battery cover.
4) Use 6 C cell 1.5V R14 battery or UM2 battery.
5) Ensure the polarity of the batteries is correct.
6) Re-attach the battery cover.
Cleaning
Clean only with a dry cloth; do not use solvents.
Before use, ensure unit is clean and dry; visually inspect all leads, connectors,
and case. Any damage or wear must be rectified to preserve user safety.
Service
This unit should be calibrated and repaired by an authorised service centre.
To ensure the accuracy of the device it should be must calibrated annually.
There are no user serviceable parts.
Environmental rating
Operating temperature range 0 Deg C to 40 Deg C, Do not expose to moisture or
condensation as incorrect readings may result.

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Storage temperature range -25 Deg C to 65 Deg C.
Batteries should be removed prior to storage.
Manufactured by Uni-T an ISO9001 company.
Distributed in The UK by:
PASS Ltd
1 Alberto Street
Stockton On Tees
Teesside
TS18 2BQ
0800 247 1600
www.tester.co.uk