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15. Repair and Warranty 

The instrument contains static sensitive devices, and care must be taken in handling the printed circuit board. If 
an instrument’s protection has been impaired it should not be used, but send for repair by suitably trained and 
qualified personnel. 
 
The protection is likely to be impaired if for example; it shows visible damage; fails to perform the intended 
measurements; has been subjected to prolonged storage under unfavourable conditions, or has been subjected 
to severe transport stresses. 
 

NEW INSTRUMENTS ARE GUARANTEED FOR 3 YEARS FROM THE  

DATE OF PURCHASE BY THE USER. 

 
NOTE:

 Any unauthorized prior repair or adjustment will automatically invalidate the Warranty. 

 
CALIBRATION, REPAIR AND SPARE PARTS 

For service requirements for Megger instruments 

contact

 
Megger Limited 

or 

Megger  

Archcliffe Road 

 

Valley Forge Corporate Centre 

Dover 

 

2621 Van Buren Avenue 

Kent CT17 9EN 

 

Norristown PA 19403 

England 

 

U.S.A. 

 
Tel: +44 (0) 1304 502 243 

 

Tel: +1 610 676 8579 

Fax: +44 (0) 1304 207342 

 

Fax: +1 610 676 8625 

 
Megger operate fully traceable calibration and repair facilities, ensuring your instrument continues to provide the 
high standard of performance and workmanship you expect. These facilities are complemented by a worldwide 
network of approved repair and calibration companies which offer excellent in-service care for your Megger 
products. 
 

Returning your product to Megger - UK and USA service centres 

1.  When an instrument requires recalibration, or in the event of a repair being necessary, a Returns 

Authorisation (RA) number must first be obtained from one of the addresses shown. You will be asked to 
provide the following information to enable the Service Department to  prepare in advance for receipt of 
your instrument, and to provide the best possible service to you. 

 

 

 

Model, e.g. LTW300 

 

Serial number, (e.g. 61110357050305/1234) 

 

Reason for return, (e.g. calibration required, or repair) 

 

Details of the fault (if the instrument is to be repaired) 

 
2.  Make a note of the RA number. A returns label can be emailed or faxed to you if you wish. 
3.  Pack the instrument carefully with plenty of padding, but no pressure on window or glass. 
4.  Ensure the returns label is attached, or that the RA number is clearly marked on the outside of the package 

and on any correspondence, before sending the instrument, carriage paid, to Megger. 

 

5.  You may track the progress of your return on line by accessing the Service/Support facilities at 

www.megger.com 

 

 

Approved Service Centres 

A list of Approved Service Centres may be obtained from the UK address shown. If outside UK/USA please 
consult your distributor for the most convenient Service Organisation.

 

 

 
 
 

Summary of Contents for LTW315

Page 1: ...M LTW300 Series Earth Loop testers User Guide...

Page 2: ...lace whilst conducting tests Test leads probes and crocodile clips must be in good order clean and with no broken or cracked insulation On test leads fitted with a outlet plug and flying leads never c...

Page 3: ...oop test 14 High current Phase to Neutral loop test 14 High current Phase to Phase loop test 15 High resolution loop test LTW425 only 15 Prospective fault current display PFC 15 PFC measurement 15 Pos...

Page 4: ...nings and instructions before attempting to use the instruments This user guide describes the operation and functions of the following LTW300 series of loop impedance testers LTW315 LTW325 LTW335 LTW4...

Page 5: ...d return it to Megger as soon as possible to help us reduce any delays in supporting you should the need arise Carton contents for the LTW315 LTW325 LTW335 and LTW425 1 x LTW series loop tester 1 x 2...

Page 6: ...sults Fuse Blown Refer to User manual Battery status Ranges Supply noise warning R1 R2 Function selected Zref function selected required before R1 R2 can be measured Loop test active Temperature warni...

Page 7: ...n Backlight On Off Test lead connections See section 2 5 Loop test function all except LTW315 Z MaxZ R1 R2 Zref Neck strap slots Range selector NO TRIP High Current HIGH Res LTW425 Volts Frequency Set...

Page 8: ...ntrols OK Confirms a test result delete request ESC Aborts a result save process UP DOWN arrows Scrolls through circuit and distribution board numbers STORE Stores last test result LAST As next NEXT S...

Page 9: ...ifting up front panel tab 1 2 Foldaway underneath instrument 2 3 and push into retaining slot 4 Single or 3 Phase connection Earth Neutral or 2nd phase connection Warning Read user guide Maximum 300V...

Page 10: ...ssist drying 4 General operating instructions 4 1 Backlight operation Pressing the BACKLIGHT button will toggle the backlight on and off The backlight will automatically switch on at the start and end...

Page 11: ...zardous in a live socket outlet 4 3 Test lead connection The supplied test leads should be connected to the appropriate sockets on the rear of the instrument marked L0 L2 and L1 Standard test probes a...

Page 12: ...the noise symbol is displayed at the end of a test the test should be repeated or the test mode changed to mode 2 refer to section 8 SETUP procedure Mode 2 AUTO Default setting In Mode 2 the LTW loop...

Page 13: ...5 IS NOT RATED FOR PHASE TO PHASE MEASUREMENTS ON 240 VOLTS TO EARTH SYSTEMS 5 2 Performing a loop test Note Factory settings for the instrument are AUTO START enabled Mode 2 extended testing enabled...

Page 14: ...fast loop test WARNING This test is designed for non RCD protected circuits Due to the high currents used the instrument adds a brief pause between tests to prevent overheating This is indicated by th...

Page 15: ...nt display PFC NOTES The PSCC of a circuit is the largest Prospective Fault Current PFC In a single phase system this would be the larger of the earth loop PFC and the neutral loop PSCC In a multi pha...

Page 16: ...ortion of reactance in the measurement Worst case operating error calculated for Non Trip measurement mode in accordance with IEC 61557 3 1997 Intrinsic error or influence quantity Reference condition...

Page 17: ...ted 6 All subsequent loop test measurements will have the Zref resistance subtracted 7 To view the stored value of Zref press the PFC key press the PFC again to return to the R1 R2 value 8 If measured...

Page 18: ...Record number Each test result is assigned a unique record number from 0 to 999 logged automatically This cannot be changed by the user 7 2 To store a result 1 Make a Z MaxZ Zref or R1 R2 loop measure...

Page 19: ...nload from the software tool bar 4 Connect the tester to the PC using the USB download lead 5 Set the lower range knob to SEND 6 The instrument will automatically download its contents to the PC A bar...

Page 20: ...the function 4 Press the key to cycle through the options available for that function Once the desired option is displayed press TEST to store setting The display will show Ok and then return to the...

Page 21: ...Press the TEST button to store the offset The display will show Ok to confirm setting has been saved 15 The display will show the as a reminder to warn of there is a loop resistance offset selected To...

Page 22: ...ing test Retest or investigate source of noise Instrument needs calibration Further testing is possible but not recommended Noise symbol displayed at end of test indicates result may have been adverse...

Page 23: ...possible until batteries have been replaced Note NiMH rechargeable batteries show a lower charge than Alkaline batteries and may not give much warning before becoming exhausted Faulty stuck key or sw...

Page 24: ...n unused for an extended period 10 3 Fuse Blown indication If the fuse has blown after contact with a live supply the fuse blown symbol and the UnS message will be displayed and the instrument will st...

Page 25: ...0 03 100 V a c and 300 V a c LTW325 and LTW425 10 0 02 LTW425 15 0 03 50 V a c LTW325 LTW335 and LTW425 Nominal test current No Trip loop test 15 mA at nominal 230 V a c supply High current loop test...

Page 26: ...rdance with IEC61326 1 Operational uncertainties Refer to www megger com Power supply Battery 8 x 1 5 V cells IEC LR6 type AA alkaline Rechargeable 8 x 1 2V NiMH cells Battery life 2000 consecutive te...

Page 27: ...ted by a worldwide network of approved repair and calibration companies which offer excellent in service care for your Megger products Returning your product to Megger UK and USA service centres 1 Whe...

Page 28: ...com Megger Pty Limited Unit 26 9 Hudson Avenue Castle Hill Sydney NSW 2125 Australia T 61 0 2 9659 2005 F 61 0 2 9659 2201 E ausales megger com Megger Limited 110 Milner Avenue Unit 1 Scarborough Ont...

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