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M

LT300 Series
Earth Loop Testers

USER MANUAL

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Summary of Contents for LT310

Page 1: ...M LT300 Series Earth Loop Testers USER MANUAL...

Page 2: ...orities may recommend the use of fused test leads when measuring voltage on high energy systems The battery cover must be in place whilst conducting tests Voltage indicator LED s cannot reveal a N PE...

Page 3: ...warnings 3 Introduction 4 General description 5 Case contents 7 LCD display 6 Front panel 6 Connection panel 7 Lid open closure 7 Preparations for use 8 Batteries 8 Preliminary test lead check 8 Gener...

Page 4: ...test Phase Phase loop test PFC display INTRODUCTION GENERAL DESCRIPTION 4 Thank you for purchasing the Megger Earth Loop Impedance Tester For your own safety and to get the maximum benefit from your...

Page 5: ...s 1 x Plug ended test lead 8 x AA LR6 batteries fitted in instrument 1 x Warranty card 1 x Certificate of test 1 x Calibration certificate 1 x CD containing user manual 1 x Quick start guide 1 x Downl...

Page 6: ...6 LCD DISPLAY FRONT PANEL...

Page 7: ...any time OK Final operation to save the result Selects the job db circuit number ie 01 02 03 etc Lid open closure 1 Open lid by lifting up front panel tab 1 2 Fold away underneath instrument 2 3 and p...

Page 8: ...strument will warn the operator and prevent further testing until the instrument has had a chance to cool down Fuse Blown A fuse blown will prevent the instrument from making further tests The fuse in...

Page 9: ...hot Indicates the instrument needs to cool down before it can continue loop testing Noise on the circuit under test may affect the reading Setup procedure Reverse polarity or line neutral swapping Thi...

Page 10: ...appliance The mains plug test lead supplied with the Megger tester is a test lead that forms part of the measuring circuit of the instrument The overall length of this lead must not be altered If the...

Page 11: ...ipping loop test No Trip Earth loop impedance measurement at a power socket The No Trip range is a high resolution 0 01 low test current earth loop resistance measurement range It requires a connectio...

Page 12: ...ssing the TEST button 12 Bonded metalwork testing Repeat the above test but with the green lead connected to the exposed metalwork For a Hi current phase to earth loop impedance measurement at a power...

Page 13: ...display will show 480 V Over temperature hot To protect the instrument from over heating during Loop testing thermal protection is fitted If the message hot appears in the display together with the G...

Page 14: ...d result must be stored in the instrument s memory Zref prior to measuring R1 R2 Saving a Zref distribution result 1 Switch the range knob to Zref 2 Select a No Trip or Hi loop test as appropriate 3 C...

Page 15: ...the phase to earth voltage Phase to Phase voltage measurement LT320 and LT330 NOTE measured voltage must not exceed 300 V phase to earth To measure the voltage of the electrical supply 1 Set the inst...

Page 16: ...show the phase sequence indicates R B Y sequence or 1 2 3 indicates R Y B sequence or 1 3 2 NOTE If one of the lines is faulty neither of the symbols is displayed and just the normal neon polarity ind...

Page 17: ...r is displayed 3 Press OK and the test result will be displayed Note Only the last test result can be recalled to the display To recall the PFC value press LAST or NEXT value if applicable 17 TEST RES...

Page 18: ...NING This operation is not reversible All data will be deleted 18 REPLACING BATTERIES Batteries Battery type 8 x LR6 AA 1 5 V Alkaline or 8 x 1 2V NiCAD or 8 x 1 2V NiMH Low battery warning symbol The...

Page 19: ...tended periods of time Fuse Blown indication The fuse blown symbol findicates that an internal fuse has failed This instrument is fitted with a factory fitted fuse and should only be replaced by an au...

Page 20: ...rement Range 0 V to 500 V Accuracy 2 2 digits Frequency measurement LT320 and LT330 Range 25Hz to 450Hz Accuracy 25 0Hz to 199 9Hz 0 1Hz 200Hz to 450Hz 1Hz Phase rotation indicator LT320 and LT330 Thr...

Page 21: ...idity Operating range 5 C to 40 C Operating humidity 93 R H at 40 C max Storage range 25 C to 70 C Maximum altitude 2000 m Environmental protection Weather proof to IP54 Safety Meets the requirements...

Page 22: ...ng amendment No 1 Basic and service errors Loop test ranges The basic error is the maximum inaccuracy of the instrument under ideal conditions whereas the service error is the maximum inaccuracy takin...

Page 23: ...plug test lead BS 1363 BS Versions 6220 740 Mains plug test lead CEE 7 7 EN versions 6220 741 Mains plug test lead AS NZS 3112 AU versions 6220 790 USB download lead 25970 041 Download Manager CD 6111...

Page 24: ...ng and Instrument for Repair If it is necessary to retun an instrument for repair a Returns Authorisation number must first be obtained by contacting one of the addresses shown You will be asked to pr...

Page 25: ...er 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 O...

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