Megger PAT420, PAT450, PAT410 User Manual

PAT400 Series

Portable Appliance Testers

User guide

Thank you for purchasing the Megger PAT400 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 Ltd

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

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Contents

X.1 Unpacking the carton 5

X.2 Safety Warnings 6

X.3 Symbols used on the instrument 7

1. Instrument Layout 9

1.1 Overview of the PAT400 9

1.2 Instrument layout 9

1.3 Button functions 9

1.4 HOT KEY descriptions 10

1.5 Display information for home tab 11

1.6 Screen navigation 11

1.7 Text ﬁelds (free form box) and Drop down boxes 12

1.8 Battery location, ﬁtting and replacement 13

1.9 Fuse location and replacement 13

2. Getting started 14

2.1 Switching ON the PAT 400 14

2.2 HOME screen explained 16

2.3 Switching off the PAT400 17

3. Testing with a PAT400 18

3.1 Connecting an asset to the PAT400 18

3.2 Testing an asset 19

3.3 Test progress 24

3.4 Remote probe and clip 24

3.5 Short circuit assets 29

3.6 Aborting a test 29

3.7 Completion of testing 29

6. Editing and deleting assets and results 41

6.1 Editing asset data 41

6.2 Deleting assets 42

7. DATA – Test results and data transfer 44

7.1 Backup to USB memory stick 45

7.2 Importing / restoring data from USB memory stick 46

7.3 Export results to CSV 48

7.4 Accessing test results 49

8. Test groups 52

8.1 Creating a test group 52

8.2 Allocating test groups to Hotkeys 54

8.3 Editing a test group 56

8.4 Deleting a test group 57

8.5 Repeated Tests 57

9. Quick test - QT 59

9.1 Running a quick test 59

10. SETUP menu options 60

10.1 Clients 60

10.2 Locations 63

10.3 Company 66

10.4 Quick test conﬁguration 67

10.5 Date / Time settings 68

10.6 Changing Language 69

10.7 Restoring default settings 70

10.8 ABOUT - PAT400 software version and Megger contact details 72

3.8 Test fail screen 30

3.9 Visual inspection 30

3.10 Repair code 31

3.11 Cable compensation 32

3.12 WARNINGS 33

4. Using the memory 35

4.1 Important overview 35

4.2 Saving a test result 36

5. Adding assets to memory 38

5.1 Adding assets to memory before testing 38

5.2 Copying the previously added asset 39

11. PAT400 Users, levels and access settings 73

11.1 User names, account status and Login 73

11.2 Power Up and Log in/Log out options 74

11.3 Managing accounts 76

11.3.1 Reverse L-N Polarity (not available on all instruments) 87

11.3.2 Measure PE Option (not available on all instruments) 89

11.4 Recovery Login 90

12. Care and Maintenance 91

13. Carry case 91

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Appendix A Test types explained 92

A.1 Continuity & bond testing 92

A.2 Insulation testing 93

A.3 Leakage testing 93

A.4 Load testing 94

A.5 RCD testing 94

A.6 Power lead/extension lead testing 95

A.7 Flash testing (PAT450 only) 95

A.8 Parallel Earth Path WARNING: 95

A.9 PAT400 Factory Default Test Groups 97

Test Groups for UK PAT Variants: 97

Test Groups for Australian/ New Zealand PAT Variants: 99

Test Groups for International/ European PAT Variants: 100

Appendix B - Barcode sample table 108

Appendix C - Speciﬁcation 111

Appendix D - Ordering information 114

Appendix E - Repair and Warranty 115

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X.1 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 Instruments Limited as soon as possible to help us reduce any delays in supporting you should you need assistance.

UK carton contents European carton contents

PAT410, PAT420 and PAT450 PAT410, PAT420 and PAT450

1x PAT400 series appliance tester 1x PAT400 series appliance tester

1x Carry case + carry handle and strap 1x Carry case + carry handle and strap

1x Quick-start guide 1x Quick-start guide

1x Black test lead set with probe and clip 1x Black test lead set with probe and clip

1x IEC type power cord 30 cm (Extension lead adaptor) 1x IEC type power cord 30 cm (Extension lead adaptor)

1x PC power supply test adaptor 1x PC power supply test adaptor

1x Warranty card 1x Warranty card

1x Owners CD manual 1x Owners CD manual

1x Flash test lead (PAT450 ONLY) 1x Flash test lead (PAT450 ONLY)

1x 9 V PP3 rechargeable NiMH Battery 1x 9 V PP3 rechargeable NiMH Battery

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X.2 Safety Warnings

The following safety warnings and precautions must be read and understood before the instrument is used. They must be observed during use.

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For safety, only connect the PAT to a supply that is properly earthed. If in doubt, the supply should be checked by a qualiﬁed electrician.

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Do not use the instrument if there are any signs of damage.

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All test leads, probes and clips must be in good order, clean and with no broken or cracked insulation.

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Probes and clips should be held behind the ﬁnger guard.

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Test leads not used during a measurement should be disconnected from the appliance tester.

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For dual voltage testers, both sockets can be live simultaneously.

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Only connect one asset to the PAT during testing.

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Tests should be carried out in the order recommended below. An appliance that fails a test should be repaired before further testing is carried out.

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Recommended sequence:

1. Earth bond / continuity of the protective earth conductor (Class I devices)

2. Insulation test (or earth leakage)

In addition further tests can be performed, but ONLY AFTER 1 & 2 above:

3. Operational test

4. Leakage test

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Only perform an operational test after the earth bond and insulation tests have been completed, as this test operates at mains voltage.

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During testing, ensure no hazard will exist as a result of normal running or under fault conditions.

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During testing the unit under test (asset) should not be touched, other than using the appropriate accessories, as faulty appliances can present a shock hazard.

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Do not touch the exposed parts of test leads during tests as hazardous voltages may be present due to potentially faulty appliance.

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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.

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Assets should not be routinely ﬂash tested. Where ﬂash testing is required, refer to further guidance on Flash testing, section A7.

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Replacement fuses must be of the correct rating and type. Refer to section 1.9.

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The USB connection marked thus ( ) should only be used by approved service personnel; nothing should be connected to the USB port during testing.

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Only use a NiMH rechargeable 8.4 V PP3 battery, do not use a non-rechargeable type as this could become dangerous if charged by the instrument.

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Serviceable fuses should only be replaced with those that are suitably rated.

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In case of an emergency use an easily accessible power point

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Only use Megger approved accessories with this product.

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Installation Category Deﬁnitions:

CAT II

Measurement category II: Equipment connected between the electrical outlets and the user’s equipment.

CAT III

Measurement category III: Equipment connected between the distribution panel and the electrical outlets.

CAT IV

Measurement category IV: Equipment connected between the origin of the low-voltage mains supply and the distribution panel.

X.3 Symbols used on the instrument

F Caution: risk of electric shock

G Caution: refer to accompanying notes.

c Equipment complies with relevant EU Directives

Equipment complies with ‘C tick’ requirements

f Fuse

This equipment should be recycled as electronic waste

HV test lead in unlocked position

HV test lead in locked position

NIMH 8.4 V

PP3/6R31

Battery type ﬁtted

230 V

Do NOT connect to mains supply

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WEEE 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 distributor or visit your local Megger website.

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 - NiMH rechargable 8.4 V PP3 batteries.

They are located under the battery cover on the right hand side cover of the instrument.

They can be safely removed by following the instructions in the battery replacement section of this guide.

Dispose of batteries according to local authority regulations.

Megger is registered in the UK as a producer of batteries.

The Registration number is BPRN00142.

For Further information see www.megger.com

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1 Instrument Layout

1.1 Overview of the PAT400

The PAT400 series of portable appliance testers are fully automated testers for the fast safety testing of portable electrical equipment. The PAT400s will operate at 230 V AC (or for UK variants 230 V AC and 110 V AC supplies).

All warnings must be read and understood before the tester is used.

All operators should also be competent in the safety testing of electrical equipment and meet all the local legal requirements before testing.

9 V PP3 rechargeable NiMH Battery is supplied - not ﬁtted. This should be installed prior to ﬁrst use. See section 1.8 for instructions.

1.2 Instrument layout

1. Qwerty Keypad

2. Escape button

3. Home button

4. Power off

5. USB interfaces

6. Lead null post

7. Bond/Continuity socket

8. 110 V test socket (UK ONLY)

9. Flash test socket

10. IEC/Extention lead return test socket

11. Mains test socket

12. Fuse checker

13. Hot keys

14. QVGA colour display

15. UP/DOWN/LEFT/RIGHT navigation keys

16. OK button

17. TEST button

PAT450 instrument layout

18. (QT) Quick test access button

1.3 Button functions

Button functions

Power down – Prevents battery discharge

Returns to HOME screen

Escape – Exit screen without saving

Hot keys. - Function depends on adjacent

display icon. Used for fast selection of options.

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1.4 HOT KEY descriptions

Other Hotkeys

Home screen

Class 1 test groups

Class II test groups

Power/extension leads

Portable RCD

Add asset

SETUP screen

Test group manager

Change client

Add

Edit

Save

Find asset

Copy last asset

Copy last asset (& increment asset ID)

View test result

List test groups

Re-run test

Change location

Bond/Ext. lead null

Edit asset

Delete

Save/print-label

Print barcode

Repair code pop up box activation

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1.5 Display information for home tab

Menu bar

Main display area

PAT400 display

Menu bar

Provides navigation path and menu options. See NOTE below

Main display area

Display and test result information

Additional menu options

Hot keys

Quick access to frequently used test groups, and other options.

NOTE: Users tab is only available on Firmware version V2.4 and above.

Hot Keys

1.6 Screen navigation

Use the UP/DOWN and LEFT/RIGHT arrows to navigate around the menu and asset screens.

Use the OK button or CR (enter key) on the keyboard to select or conﬁrm an action.

Use the HOME

Use the ESC

button to return to the main menu.

button to exit or abort a function.

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1.7 Text ﬁelds (free form box) and Drop down boxes

When entering basic ASSET data, two types of text ﬁelds exist:

1. Free form boxes

2. Drop down box

Free form box

Text or numbers can be entered as required

Text can be entered from a keyboard or barcode scanner.

In some instances a “free form” box can become a “drop down” box, such as the asset ID ﬁeld. In this case it will appear with the drop down icon as below:

Drop down box.

Drop down boxes already contain a list of items. To access the list, navigate to the drop down box using the UP/DOWN arrows then press the OK button.

Press OK to select from the available list.

Alternatively, enter the ﬁrst letter or number of the contents you require, and the search engine will jump to that entry.

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E.g. Enter “S” in the TEST GROUP box and the cursor will jump to SC1.

If no contents start with that letter or number, nothing will happen.

1.8 Battery location, ﬁtting and replacement

Battery type: 1 x 8.4V NiMH rechargeable (PP3, IEC6F22, NEDA 1604,6HR61)

An 8.4V IEC6F22 NiMH rechargeable battery is included with all PAT400s and should be ﬁtted prior to ﬁrst use in the battery compartment which is on the right hand side of the unit, secured with a screw. The battery is continuously charged whilst the PAT400 is powered. The battery provides a fast re-boot function when the PAT400 is unplugged, moved between locations and re-started within 5 minutes. The battery shall only be replaced by an equivalent rechargeable battery when the re-boot facility ceases to work.

To replace the rechargeable battery:

1. Switch off the instrument.

2. Disconnect the instrument from any electrical circuits.

3. Remove the battery cover.

4. Remove the old battery and reﬁt new battery following correct polarity (as marked on the battery compartment).

5. Replace the battery cover.

Warning: Only use NiMH batteries! Do not attempt to recharge non-rechargeable (Primary) cells in the PAT400. Doing so may result in instrument damage and may cause personal injury.

1.9 Fuse location and replacement

Fuse type:

PAT400 EU, DE, AU, US 2 x 2A (F) HBC 50kA 600V (Part No. 90000-939)

PAT400 UK 1 x 250 V AC 100mA HBC 1.5KA (part No. 25413-295)

Warning: Fuses are at mains potential. The electrical supply MUST be disconnected prior to removing the fuse cover which is located on the underside of the PAT tester, secured with a screw.

1. Switch off the instrument.

2. Disconnect the instrument from any electrical circuits.

3. Remove the fuse cover on the underside of the PAT tester.

4. Remove each fuse in turn and check for failure.

5. Replace as necessary.

6. If no fuses have failed, contact Megger Technical services group on 44 (0) 1304 502 102.

7. Replace fuse cover when complete.

NOTE: The 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 supplier of batteries. The Registration number is BPRN00142

symbol on the batteries is a reminder not to dispose of them with general waste at the end of their life. Spent NiMH

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2 Getting started

2.1 Switching ON the PAT 400

1. Connect the instrument to a suitable electrical supply, either 230 V AC (or 110 V AC for UK instruments).

For testing 230 V electrical equipment, connect the PAT tester to a 230 V electrical outlet.

For testing 110 V electrical equipment, connect the PAT tester to a 110 V electrical outlet, using the optional 110 V to 230 V supply lead adaptor. Refer to section 3 for further details.

The appliance tester will automatically start when connected to the mains supply.

IMPORTANT: DO NOT connect any equipment to the PAT tester until it has been switched on and passed its self-test. Connected equipment will create a relay error and necessitate restarting the PAT tester. Power should be disconnected and reconnected.

Start-up / initialisation

The ﬁrst time the PAT tester is started the instrument will ask for the operating language, time and date to be set.

1. Use the UP/DOWN arrows to select the operating language from the options listed.

2. Press OK when complete

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3. Use the RIGHT/LEFT and OK keys to enter the date and time Date format is DD / MM / YYYY Time format is 24 Hr Hr / Min / Sec

4. Press the SAVE

HOTKEY to accept changes.

Further changes can be made in the menu SETUP options section 10.5

On completion of the initialisation the following warning screen is displayed when the PAT tester is switched on.

PAT400 instruments Warning dialogue box

NOTE: This screen is not displayed if the PAT tester is re-started within ﬁve minutes of being un-plugged, or when the PAT tester restarts from the same screen as before.

5. Press OK to conﬁrm you have read and understood these warnings. The instrument will display the following HOME screen when all initial tests have completed

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2.2 HOME screen explained

The HOME screen is the start point of all testing

Menu Functions

Class I test groups

Class II test groups

Class IEC (Power) and extension lead test groups

Plug In RCD test groups

Add asset

Home

Test launch screen

HOT KEY access

Instrument status

Setup

Client

Location

Company

Quick test keys

Setup date/time

Language

Default settings

About

DATA

Backup to USB

Restore from USB

Export to USB

(CSV) View results

Users

Expert Options

Manage Users

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2.3 Switching off the PAT400

Normal Power-Off

To switch off the tester, press the RED off button . The display will show the message

The mains plug can now be removed from the supply.

Switching off using this button prevents the “FAST Re-start” battery from discharging unnecessarily.

FAST Re-start

If the tester is to be moved to a new location and testing continued, simply unplug the unit from the mains supply and reconnect it in the new location. The appliance tester will enter a hibernation mode during the move. When power is restored at the new location the PAT tester will resume to the same screen as when power was disconnected, without any delay.

Any test results are retained. On reconnection the previous test result can still be saved.

The rechargeable 8.4 V NIMH battery is used to maintain hibernation status whilst unplugged. This battery is continuously charged whilst the appliance tester is connected to the mains supply.

Continuous use of the hibernation mode will discharge the battery. Should the move take longer than 5 minutes, the appliance tester will leave hibernation mode and complete a full power down.

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3 Testing with a PAT400

3.1 Connecting an asset to the PAT400

Assets are tested through the test connectors on the top of the instrument. An asset is simply plugged into the appropriate socket.

A power cord (IEC lead), or an extension lead needs to be “wrapped back” to the small IEC socket on the top of the instrument. This allows automatic testing of continuity and polarity without connecting the remote probe.

Standard Class I and Class II assets will also use the additional remote probe for BOND, INSULATION or LEAKAGE testing. The instruction to connect it is displayed on the screen at the appropriate time.

The following drawings show how the asset under test should be connected at the start of testing.

NOTE: The dotted line indicates where a 110 V asset would be connected (UK PAT testers only).

Other test leads may need to be connected during the test sequence. Follow on-screen instructions. NEVER CONNECT MORE THAN ONE ASSET AT A TIME.

Connecting a Class I or Class II asset

To connect standard Class I or Class II equipment to the PAT400:

1. Plug the asset into the 230 V test socket on the PAT400.

To connect 110 V equipment to the PAT400:

1. Plug the asset into the 110 V test socket on the PAT400.

Connecting an IEC type power cord or 110 V (Power) lead

To connect a standard IEC type power cord (computer type power lead) to the PAT400:

1. Connect the mains plug to the mains test socket on the PAT400.

2. Connect the IEC plug to the IEC socket.

To connect a 110 V power lead, use the 110 V to IEC plug adaptor (see optional accessories - Appendix D).

1. Connect the 110 V mains plug to the 110 V test socket.

2. Connect the free end of the 110 V power lead to the 110V adaptor plug.

3. Connect the 110 V adaptor IEC connector to the IEC socket on the PAT400.

Connecting an extension lead

To connect an extension lead to the PAT400:

1. Connect the mains plug to the mains test socket on the PAT400.

2. Using the extension lead adaptor, connect the furthest socket on the extension lead to the IEC socket on the PAT400.

To connect a 110 V power lead, use the 110 V to IEC plug adaptor (see optional accessory

- Appendix D).

1. Connect the 110 V mains plug to the 110 V test socket.

2. Connect the free end of the 110 V power lead to the 110V adaptor plug.

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3. Connect the 110 V adaptor IEC connector to the IEC socket on the PAT400.

Connecting a portable RCD

To connect a portable RCD to the PAT400:

1. Connect the RCD to the 230 V test socket on the PAT400.

2. Using the IEC test lead adaptor, connect the IEC plug of the adaptor lead into the IEC socket on the PAT400.

3. Connect the mains plug of the IEC test lead adaptor into the RCD.

3.2 Testing an asset

The PAT400’s are designed to automatically test electrical equipment, using TEST GROUPS. A “TEST GROUP” is a speciﬁc group of tests suitable for the type of asset being tested.

The PAT tester is shipped with a pre-deﬁned set of test groups. However others can be added as required, up to a maximum of 100, see section 8.

Before a test will run, a TEST GROUP must be selected. There are three options to start the test sequence:

OPTION 1 Select a test group from the HOTKEY options.

OPTION 2 Press the TEST button – This takes you to the TEST ASSET screen.

OPTION 3 Scan the asset ID with a bar-code scanner, then press TEST (asset details must already be stored in the PAT400), otherwise PAT400 defaults to ADD ASSET screen.

Option 1: Starting a TEST – USING HOT KEYS

1. Select a Class I, Class II, IEC/extension lead or RCD test group by pressing one of the HOT KEY options: A list of TEST GROUPS are displayed that are relevant to that type of equipment

2. Select one of the test groups by pressing the relevant number, then the TEST button. Or Press the number twice to start the test sequence. Or Scroll down to the required test group and press TEST.

Class I test groups

Class II test groups

Class IEC (Power) and extension lead test groups

Plug In RCD test groups

Add asset

For more Information on test groups, adding, editing, conﬁguration or deletion, go to section 8.

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Option 2: Starting a TEST – PRESSING THE TEST BUTTON

1. From the HOME screen, press the TEST button. The display will show the TEST ASSET page, as below:

2. Type in the “Asset ID” if available and press OK. If the asset is already in the database the details of the asset will be displayed as below:

Find asset

Search for TEST GROUPS Press once for direct entry Press twice for drop down box.

Add ASSET

Edit ASSET

3. Press the TEST button and the test sequence will commence. Go to 3.3 TESTING PROGRESS.

Alternatively to search through the asset database, press the FIND ASSET

A drop down box of Asset IDs will appear.

If you know the Asset ID you wish to ﬁnd, start typing in the Asset ID. The search engine will jump to the Asset IDs that start with those characters.

To ADD an asset, simply press the ADD ASSET

4. If the entered asset is not in the database, the following information box will appear:

Hotkey.

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5. Press OK to add a new asset.

6. An Add Asset screen will appear with the Asset ID entered in the previous screen, and the current client name and location.

If no client and location have been added, these will say “default”.

* Indicates mandatory ﬁelds that are required to save the asset data.

Further information on the COPY LAST ASSET

(A new asset ID can be added and saved at this stage, but it is recommended that this is added after testing is completed).

7. Press the DOWN arrow to access TEST GROUPS.

8. Press OK to access the drop down list of test groups.

Hotkey and COPY & INCREMENT ASSET ID Hotkeys can be found in section 5.

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9. Use the UP/DOWN arrows to scroll through the list of test groups and then press OK Or Start typing the name of the test group. The cursor will jump to the relevant test groups with that letter or number. Entering more than one letter will reﬁne the search further. Then press OK.

10. Add any additional data in the available ﬁelds as required.

11. Press TEST to commence testing.

12. Go to section 3.3 Test Progress

NOTE: Only a TEST GROUP is required to start testing. On completion of a test, only Asset IDs and Test groups have to be added before the test is completed. All other data Is optional.

NOTE: If NO Asset ID is entered, press the Test Group Hotkey

Alternatively press the scroll down the list to select desired test group and press OK to accept.

NOTE: Pressing the Right arrow key will “Page Down” the list.

Further details on adding assets can be found in section 5.

twice to select the test group drop down box. Press OK to list all test group options,

and type in the test group.

Option 3: Starting a TEST – USING A BARCODE SCANNER

1. From the home page, scan the Asset barcode with the optional barcode scanner.

If the ASSET ID does NOT exist in the PAT database, the PAT will jump to the ADD ASSET screen and the ASSET ID will appear.

1. If the asset information matches the asset to be tested the completed TEST ASSET screen will appear as below:

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Find asset

Search for TEST GROUPS Press once for direct entry Press twice for drop down box.

Add ASSET

Edit ASSET

2. Check the asset information matches the ASSET to be tested. If so, press TEST and go to section 3.3 TEST PROGRESS.

If the asset information does not match the asset to be tested, check the CLIENT is correct.

NOTE: The same ASSET ID can be used for different clients, but one client cannot have duplicate asset IDs.

If the asset ID does not exist the screen will jump to the Add Asset screen and automatically ﬁll the ASSET ID ﬁeld with the scanned barcode data.

3. Press the DOWN arrow to move to Test Groups.

4. The TEST GROUP is selected by pressing OK and selecting from a drop down list.

Typing the ﬁrst letters or numbers of the test group will allow the search engine to jump to those test groups without having to scroll down the list.

Additional information can also be added, but this is not essential.

NOTE: When scanning an Asset ID that exists in the database under a location that is different to that set in the PATs current status, a yellow warning indicator will show on the Location ﬁeld as below. Go to section 10 for additional information on Clients and locations.

5. Press the TEST button. Go to section 3.3 TESTING PROGRESS for further information on the test sequence.

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3.3 Test progress

The PAT400 displays all tests to be performed within the selected test group.

Each test is run sequentially and the results displayed for each test before proceeding to the next test.

A “FAIL” on any test will prevent further testing for safety purposes.

Test screen example: Class I asset

List of tests in test group

Test results column

Green – Test passed

Test limits column

Amber – Test in progress

Grey – Test pending

Pass limit set for this test

Current test values or Instructions during the test sequence

Actual measurement result

Interruption to automatic testing

Testing proceeds automatically unless an action is required from the operator. Follow “on-screen” instructions as they appear.

3.4 Remote probe and clip

Some tests will require the use of the remote probe and clip. These are used where the asset under test has no earth return (Class II assets). Tests using the remote probe include:

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Insulation testing on Class II equipment

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Continuity/bond testing on Class I equipment

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Touch leakage testing

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Differential leakage test on Class II

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Substitute leakage on Class II

The PAT400 will instruct the operator when the remote probe needs to be connected.

Example of remote probe application

Class II insulation test (Riso)

Live and neutral are shorted together automatically in the PAT (RED LINK) and a voltage (250 V or 500 V) is applied between the shorted L/N and the remote probe.

The probe is connected to any metallic locations on the “appliance under test” to ensure there is no breakdown of the insulation.

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PAT Tester Applience

500 V

The insulation test probe is connected to all exposed metal parts to ensure electrical separation from earth.

3.4.1 Test lead resistance null

The resistance of the bond lead can be “nulled” to remove the lead resistance from the measured resistance. This is important when testing very low resistances where the test limit is set to 0.1ohms.

Also, the resistance of an extension lead (IEC or Power cord) can be nulled, if the lead is longer than the red test lead supplied with the PAT.

Symbols used:

Test lead null is set

Extension lead adaptor null is set, see section 3.4.2

Both test lead and extension lead adaptor null are set

To null the test lead resistance of a bond lead:

1. From the HOME screen, use the RIGHT arrow key to select the SETUP tab.

2. Press the NULL

Hotkey. The Lead Null screen will appear as below:

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(If a lead null value is already set the lead null symbol z will be displayed)

3. Connect the black bond lead between the bond socket and the zero post on the front panel as below:

4. Press the TEST button. The PAT400 will display the value of the test lead as a Null SET value, and display the z symbol in the top of the screen as below:

The

displayed in the tab row means an extension lead null is also set.

5. To remove the Bond Lead Null select the “Remove Lead Null” and press the TEST or OK button. The symbol will disappear.

3.4.2 Extension Lead Adaptor Resistance Null

Some tests require using an IEC lead or the short extension lead adaptor supplied with every PAT tester. An example of this is testing a multiple socket extension lead:

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The resistance of the extension lead adaptor may be removed by performing an extension lead null.

1. From the HOME screen, use the RIGHT arrow key to select the SETUP tab.

2. Press the NULL (If an extension lead null value is already set the lead null symbol will be displayed)

3. Connect the extension lead adaptor between the Mains test socket and the IEC socket on the front panel as below:

4. Scroll down to select “Set Extension Lead Null” on the menu.

5. Press the TEST button. The PAT400 will display the value of the test lead as a Null SET value, and display the º symbol in the top of the screen as below:

Hotkey. The Lead Null screen will appear with the Set Lead Null option highlighted:

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6. To remove the extension lead null select the “Remove Extension Lead Null” and press the TEST or OK button. The º symbol will disappear.

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3.5 Short circuit assets

Some assets may appear to the PAT400 to be short a circuit. This can be caused by large inductive loads. In such cases, the following warning message will be displayed:

Warning: Asset may be short circuit.

Press TEST to continue, ESC to abort

Only if the operator is certain the equipment is not a short circuit, press TEST, otherwise press Esc to abort the test.

3.6 Aborting a test

All tests can be aborted at any time by pressing the TEST button or Esc (escape) button.

3.7 Completion of testing

On completion of testing all test ﬁelds should turn green as below. The test results are displayed in the centre column with the pass limits for that test group on the right.

GRAPHIC

On completion of testing, the following options are available:

Re-test asset using current test group. Warning: test data will not be saved for the previous test.

Repair codes – Allows repair details to be added to asset test results – See section 3.10 below.

Save the test results to memory and print a barcode label (a Megger USB barcode printer must be

connected prior to requesting this function).

Repeat test sequence

Repair codes

Print barcode label & SAVE results to memory

SAVE results to memory

Save test results to memory and return to the initial screen.

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Go to Section 4 to learn about using the memory, or Section 4.2 Saving a test result to memory.

To return to the HOME screen without saving the results press HOME button.

3.8 Test fail screen

Should an asset fail a test at any stage, the test sequence is stopped and the screen message Asset FAILED is displayed:

Repeat test sequence

Repair codes

Print barcode label & SAVE results to memory

SAVE results to memory

Example: Asset has failed the bond test.

Pass limit set to ≤ 0.1390 Ω, Measurement recorded at > 1.99 Ω.

The same options are available as an asset that has passed. See Section 3.7 for completion of testing.

3.9 Visual inspection

It is possible to perform a visual inspection only with no further electrical tests.

1. Press OK to Pass and skip electrical test.

If the current test group contains a visual inspection then the visual test popup will appear. This allows the user to log mechanical faults on the asset under test, such as a broken plug or damaged appliance cord, the Esc key should be used to exit the test sequence during the Visual Inspection and initiate a Visual Failure, as below:

1. During the Visual inspection option the “Visual Test” will be highlighted in yellow, as below:

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