Megger PAT120 User manual

PAT120 Series
Portable Appliance Tester
User Guide
WWW.MEGGER.COM

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Contents
Unpacking the carton 3
Safety warnings 4
Symbols used on the instrument 5
Symbols used on the connection panel 6
Instrument layout 6
PAT120 and display information 6
Measurement symbols 7
Instrument buttons 7
User guide INSTRUCTION symbols 8
Carry strap fitting and removal 9
Switching ON / OFF 10
Class I test (PAT120) using substitute leakage @ 40 V ac 11
Class II test (PAT120) Using Substitute Leakage @ 40 V ac 12
Power cord test (PAT120) 13
Extension lead test (PAT120) 14
Fail handling 15
Factory reset to default settings 16
International model variations 16
Battery and fuse replacement (PAT120, 150) 17
Battery replacement 17
Fuse replacement 18
Preventive maintenance 18
Specification 18

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Thank you for purchasing the Megger portable appliance tester.
For your own safety and to get the maximum benefit from your instrument, please ensure that you read and understand the safety warnings and instructions before attempting to use the
instrument.
These instruments are designed and manufactured by:
Megger Instruments Limited
Archcliffe Road
Dover Kent
CT17 9EN
England
Megger Instruments Limited reserves the right to change the specification of these instruments at any time without prior notice.
Unpacking the carton
Unpack the carton contents carefully. There are important documents that you should read and keep for future reference.
Please complete the pre-paid warranty card and return it to Megger Limited as soon as possible to help us reduce any delays in supporting you should you need assistance.

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Safety Warnings

The following Safety Warnings and Precautions must be read and understood before the instrument is used. They must be observed during use.

■ Only use test leads and accessories supplied or approved by Megger Instruments Limited
■ At any time the Gsymbol or Fsymbol is displayed, the user guide and warnings documentation must be consulted to identify the nature of the hazard and any actions
necessary to avoid the hazard
■ Do not use the instrument if there are any signs of damage
■ This instrument meets the EMC requirements of Class A applications. Not for use in domestic installations
■ All test leads, probes and clips must be in good order, clean and with no broken or cracked insulation
■ Probes and clips should be held behind the finger guard
■ Test leads not used during a measurement should be disconnected from the Appliance tester
■ During testing, ensure no hazard will exist as a result of normal running or under fault conditions
■ During testing the unit under test (appliance) should not be touched, other than using the appropriate accessories, as faulty appliances can present a shock hazard
■Do not touch the exposed parts of test leads during tests as hazardous voltages may be present
■Do not intentionally connect test leads to live systems or hazardous voltages
■Do not touch the IEC extension lead socket pins especially during a test, as hazardous voltages may be present due to a potentially faulty appliance
■Do not touch the exposed earth pins of the 230 V test socket during a test, as voltages may be present due to a potentially faulty appliance
■Serviceable fuses should only be replaced with those that are suitably rated
■Replacement fuses must be of the correct rating and type. Refer to page 18
■If this instrument is used in a manner not specified in the supplied documentation, the protection provided by the instrument may be compromised

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Symbols used on the instrument
G Caution: refer to accompanying notes.
F Danger: Mains voltage present during testing
c Equipment complies with relevant EU Directives
Equipment complies with ‘C tick’ requirements
Caution: Earth pins of the 230 V test socket will become hazardous if test
lead P1 is in contact with hazardous voltages during continuity test.
f Fuse failure
This equipment should be disposed of as electronic waste
Battery type fitted
Do not connect to 230 V supply
Caution: Earth pin of the 230 V test socket will become hazardous if test
lead P1 is in contact with hazardous voltages during continuity test
Product Safety Category
CATII 300 V - MEASUREMENT CATEGORY II Equipment connected between the electrical outlets and the user’s equipment.
WEE Directive
The crossed out wheeled bin symbol placed on Megger products is a reminder not to dispose of the product at the end of its life with general waste.
Megger is registered in the UK as a Producer of Electrical and Electronic Equipment. The Registration No is WEE/HE0146QT
For further information about disposal of the product consult your local Megger company or distributer or visit your local Megger website.

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Instrument Layout PAT120
Display information PAT120
Test results
Test
information
Information/
Warnings
Overall PASS/FAIL
Neck strap
slot
Test groups
Power ON – Hold for >0.5s Backlight
Main test
socket
Symbols used on the connection panel
PAT120 connector panel
GDo NOT connect P1 and P3 sockets to hazardous live voltages
P1
Continuity (Bond),
Insulation and Touch
leakage probe
connection
P3
IEC power cord
and extension lead
adaptor socket.

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Measurement (display) symbols
PAT120
Continuity of the protective earth
conductor Test in progress
Insulation resistance between the
Live/Neutral conductors and earth Measurement locked ON
Alternative method:- 40 V
ac leakage test for protective
conductor current and touch
current. Battery powered test
GNotice: Refer to user guide
WResistance in ohms
(English language models)
Alternative method:- 40 V ac
leakage test for for protective
conductor current. Battery
powered test
MWInsulation resistance in Meg Ohms
(ohms x 1x106)
mA Leakage current in milliamps
(English language models)
Alternative method:- 40 V ac
leakage test for for touch current.
Battery powered test
Cable polarity correct
Power lead or Extension lead
polarity test Live to Neutral cross polarity
Test probe P1 to be connected Live to Neutral short circuit
detected
Test or overall test group passed Live to Earth short circuit
detected
Test or overall test group failed Open circuit detected
fFuse failed General warning - Appliance open
circuit or not switched on
Instrument Buttons
Power button - Hold down for 0.5 second to switch on,
Hold down for 2 seconds to switch off
Abort button - press to stop test or exit a setup mode
Class I button
Class II button
Extension lead button
Backlight button
NOTE: The PAT100 instruments perform various pre-checks prior to testing to ensure the
asset is not short-circuit and is switched on

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User guide INSTRUCTION symbols
Press the button
Press and hold for greater than 0.5 seconds
Connect the equipment to be tested to the
instrument
Connect the P1 test lead to socket P1 on the
Pat100 and the probe to exposed metalwork
Ensure the probe is NOT connected to a 230V
source.
Connect the P1 test lead to different conductive
points on the equipment under test during the
measurement
Ensure equipment under test is switched ON

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Carry strap fitting and removal
Fitting the carry strap:
Removing carry strap:

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Switching ON / OFF
Switching ON
i) ii) iii) PAT120 iv)
>0.5 s
Switching OFF
i) Manual OFF ii) Auto OFF
>2 s Unit switches after 3 minutes of
inactivity (not adjustable)
Backlight
Aborting a test
A test can be aborted at any time by pressing the Power (ESC) button

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Class I test (PAT120) using substitute leakage @ 40 V ac
i) ii) iii) Connect BOND lead P1 iv)
Class I @ 500 V
OR
Class I @ 250 V for IT equipment
>2 s
v) Ensure probe (P1) is connected vi) Remove probe (P1)
See note below
vii) viii) Class I Pass
NOTE: If the contact symbol is displayed during the test, the PAT has detected an open circuit load. Ensure the appliance is switched on then press the Class I icon
NOTE: The PAT100 instruments perform various pre-checks prior to testing to ensure the asset is not short-circuit and is switched on

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Class II test (PAT120) using substitute leakage @ 40 V ac
Battery powered testing of equipment without an Earth return conductor
i) ii) iii)
a
b
Insulation test @ 500 V
OR
Insulation test @ 250 V
>2 s
iv) Ensure probe (P1) is connected v) Repeat contact on all exposed
conductive parts
vi) See note below vii) Class II Pass
NOTE : If the contact symbol appears, the appliance needs to be switched ON.
NOTE: The PAT100 instruments perform various pre-checks prior to testing to ensure the asset is not short-circuit and is switched on

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Power cord test (PAT120)
Testing a standard power cord
i) ii) iii) iv)
Insulation test @ 500 V
OR
Insulation test @ 250 V
>2 s
v) vi)

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Extension lead test (PAT120)
Testing an extension lead or multi-way extension lead
i)
ii) iii) Insulation test @ 500 V
OR
Insulation test @ 250 V
>2 s
iv) v) vi) vii)

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Fail Handling
i) Individual test fail indicated by a small cross:
ii) Overall FAIL indicated by a large cross:
Note : Once an appliance has failed a test further testing of the test group sequence is prevented for safety reasons except for the extension lead testing

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Factory Default settings
Factory Default Test Limits
Variant Model Rpe (Ω)
Rpe (Ω)
for Ext
lead
Rpe (Ω)
for RCD
Class 1
Riso (MΩ)
Class 2
Riso (MΩ)
Ext lead
Riso (MΩ)
Class 1
Iea, Ileak,
Ileak(sub)
Ipe
(mA)
It, Ib
Class 2
Iea, It(sub)
(mA)
1xIΔN30
(ms)
5xIΔN30
(ms)
1xIΔN10
(ms)
5xIΔN10
(ms)
PAT120-UK 0.2 0.2 0.2 1 2 1 3.5 0.25 NA NA NA NA
PAT120-DE, PAT120-CH,
PAT120-EU
0.3 0.3 0.3 1 2 1 3.5 0.5 NA NA NA NA
International model variations:
Continuity retest after fail (PAT120, DE & CH models only)
When a continuity test fails to meet the pre-set continuity resistance pass limit of 0.3 W, the test can be run again within 5 seconds at the higher 1.0 Wlimit.
Example Class I continuity FAIL. Display shows:
to retest at 1.0 Wlimit or
to FAIL test

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Battery and Fuse replacement (PAT120)
Battery type: 8 x 1.5 V Alkaline LR6 (AA) or NiMH HR6 rechargeable
Battery condition is shown by the following display symbols:
100% Full
75%
50%
25%
<25% Exhausted (Flashing)
For battery replacement:
a) Remove old cells and refit new batteries following correct polarity as marked on
the battery holder.
Either: 8 x 1.5 V AA / LR6 Alkaline
8 x 1.2 V AA / LR6 NiMH
c) Replace the battery cover.
Warning: Incorrect battery cell polarity can cause electrolyte leakage, resulting in damage to
the instrument.
Warning: Do not mix battery technologies
Warning: Do not use batteries with different charge state
Battery Disposal
The crossed out wheeled bin symbol placed on the batteries is a reminder not to dispose of
them with general waste at the end of their life.
This product contains the following batteries:
8 x AA Alkaline (LR6) 1.5V primary cells
They are located in the battery compartment on the rear of the instrument
They can be safely removed by ensuring all test leads have been disconnected from the
instrument prior to removing the battery cover with a suitable screwdriver.
Spent PAT100 batteries are classified as Portable Batteries and should be disposed of in the
UK in accordance with Local Authority requirements
For disposal of batteries in other parts of the EU contact your local Megger company or
distributor.
Megger is registered in the UK as a producer of batteries.
The Registration number is BPRN00142
For Further information see www.megger.com
To replace batteries or fuse:
Switch off the instrument.
Disconnect the instrument from all electrical circuits.
Battery replacement
Remove the battery cover from the base by using a cross head screwdriver to un
screw the battery cover fixing screw.
Spent Alkaline and NiMH batteries are
classified as portable batteries and should
be disposed of in the UK in accordance with
Local Authority requirements. For disposal of
batteries in other parts of the EU contact your
local distributor.
Megger is registered in the UK as a producer of
batteries.
The Registration number is BPRN 00142

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SpecificationFuse replacement
Possible fuse failure is indicated by the
symbol. f
For fuse replacement
Remove battery cover as above.
Withdraw fuse and check for failure.
Replace with a fuse type: 1 x 100 mA (F) 250 V 1.5 KA HBC 4 x 20 mm
Preventive maintenance
Test leads should be checked before use to ensure there is no damage.
Ensure batteries are removed if the instrument is left unused for an extended period.
When necessary, the instrument can be cleaned with a damp cloth.
Do not use alcohol based cleaners as these may leave a residue.
ENVIRONMENTAL CONDITION:
Operating ambient 20°C
Humidity Nominal humidity
CONTINUITY TEST
Test voltage Compliance Voltage: +4V dc –0% /+10 %
(open circuit)
Test current Bi-directional +200mA -0% + 50mA
(into 2Ω load)
Continuity accuracy resistance: ± 5% ± 3 digits (0 to 19.99 Ω)
Resistance resolution 10 mΩ
Display range 0.01 to 19.99Ω
Test time User selectable from 2 sec to 20 sec or selected
during test to 180sec
INSULATION TEST
Insulation test 250V dc –0 % /+25 % open circuit
500V dc –0 % /+25 % open circuit
≥ 500V –0% dc across 0.5 MΩ load
Short circuit/charge current < 2mA dc
Insulation accuracy ±3% ±10 digits (0 to 19.99 MΩ)
Resolution 0.01 MΩ
Display range 0.10 MΩ to 99.99 MΩ
Test duration User selectable from 2 sec to 20 sec or selected
during test to 180sec
SUBSTITUTE LEAKAGE TEST
Leakage current Accuracy ± 5% ± 3 digits
Test frequency Nominal mains frequency 50Hz
Test voltage < 50V ac
Leakage Current Resolution 0.01mA
Display range 0.10 to 19.99mA
Test duration User selectable from 2 sec to 5 seconds
Reading corrected to 230V ac.

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Specification
EXTENSION LEAD TEST
Test includes Insulation and Bond tests.
Test voltage 5V
Polarity Lead OK
Live neutral shorted
Live neutral reversed
Live/neutral open circuit
CIRCUIT TEST
(Carried out automatically, not available to user)
Test voltage 5V
Test frequency Nominal Mains 50 Hz
Test current < 100mA short circuit
SAFETY
Instrument designed to IEC 61010-1: 2010
Test leads designed to IEC 61010-031: 2008
300 volts to Earth Category II
Mains fuse protection to 250 volts rms ac
EMC
Design to meet IEC 61326-1: 2012 and IEC 61326-2-2: 2005.
FUSE
(user replaceable)
UK variants has mains plug fuse
One F 100 mA 250 V 5 x 20 mm HBC fuse.
ENVIRONMENTAL
Operating temperature range 0°C to +40°C
Storage temperature range -20°C to +60°C
Humidity 90%RH @ +10°C +30°C
75%RH @ +30°C to +40°C
Maximum altitude 2,000m to full safety spec.
IP rating IP40 (with front cover closed)
MECHANICAL
BATTERIES
Battery life > 30 hrs 20sec:2min Test:Standby ratio
Battery type Supply voltage
12 Vdc (Alkaline AA LR6)
9.6 Vdc (NiMH AA LR6)
WEIGHT
PAT120 (instrument only): 1150 g (40.4 oz)
Shipping weight: 2370g (83.6 oz)
DIMENSIONS
Dimensions (instrument and case) 203mm (L) x 148mm (W) x 78mm (H)
(8 x 5.7 x 3.2 inches)
Dimensions (instrument and packaging) 456mm(L) x 178mm (W) x 89mm (H)
(18 x 7.1 x 3.5 inches)

Megger Limited
Archcliffe Road, Dover
Kent CT17 9EN England
T [phone]
F [phone]
E [e-mail]
Megger
Z.A. Du Buisson de la Couldre
23 rue Eugène Henaff
78190 TRAPPES France
T +33 (0)1 30.16.08.90
F +33 (0)1 34.61.23.77
E [e-mail]
Megger Pty Limited
Unit 26 9 Hudson Avenue
Castle Hill
Sydney NSW 2125 Australia
T [phone]
F [phone]
E [e-mail]
Megger
4271 Bronze Way
Dallas
TX 75237-1017 U.S.A.
Tel: [phone] (U.S.A. only)
Tel: [phone] (International)
Fax: [phone]
Megger
Valley Forge Corporate Centre
2621 Van Buren Avenue
Norristown, PA 19403, USA
Tel: [phone]
Fax: [phone]
Megger GmgH
Obere Zeil 2
61440 Oberursel
Germany
T 06171-92987-0
F 06171-92987-19
This instrument is manufactured in the United Kingdom.
The company reserves the right to change the specification or design without prior notice.
Megger is a registered trademark
Part No. PAT120_UG_EN_V03
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