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Summary of Contents for Megger MJ159
- Page 1 MJ159 Major Megger Insulation Resistance Tester User Guide...
- Page 2 T +44 (0)1304 502101 F +44 (0)1304 207342 www.megger.com Megger Limited reserves the right to alter the specification of its products from time to time without notice. Although every effort is made to ensure the accuracy of the information contained within this document it is not warranted or represented by Megger Limited.
- Page 3 Directive 2014/53/EU. Other equipment manufactured by Megger Instruments Limited described in this user guide is in compliance with Directives 2014/30/EU and 2014/35/EU where they apply. The full text of Megger Instruments EU declarations of conformity are available at the following internet address: megger.com/eu-dofc www.megger.com...
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Page 4: Table Of Contents
5. Accessories ..........................12 6. Application Notes ........................13 6.1. Preventive maintenance ......................13 6.2. Insulation testing concepts ......................14 7. Instrument Repair and Spare Parts ..................15 7.2.1. Approved Repair Companies ....................15 7.2.2. Returning an Instrument for Repair ..................15 MJ159 www.megger.com... -
Page 5: Safety Warnings
„ The circuit under test must be switched off, de-energized and isolated before insulation or continuity tests are made. „ The MJ159 is protected for measurement connection to circuits up to CAT II 300 V Line – Ground, and 500 V Line – Line. -
Page 6: Description
Nominal test voltages are 100 V, 250 V, 500 V and 1000 V selectable. The MJ159 has a Mains (line) voltage measuring range of 0 to 600 V. Although calibrated for AC voltage, this feature will give decaying voltage indication following the testing of equipment possessing capacitance. -
Page 7: Operation
4. The resistance will be indicated on the ‘Ω’ scale. Note:- If necessary repeat the continuity test with the leads reversed. The effects of any stray e.m.fs. in the sample under test may then be negated by taking the average of the two readings. www.megger.com MJ159... -
Page 8: Insulation Testing
The instrument therefore reads the leakage of the insulator, ignoring leakage across its surface. MJ159 www.megger.com... -
Page 9: Fuse Checking And Replacement
Remove the ruptured fuse and replace with a fuse of the correct size and rating (“4. Specifications” on page 10). Refit the fuseholder and secure it with a screwdriver. www.megger.com MJ159... -
Page 10: Specifications
Specifications 4. Specifications Note: The presence of fast transients in excess of 1.0 kV or r.f. in excess of 0.5 volts on measured circuit may affect the results MJ159 Insulation Resistance: 0.1 Ω to 2000 MΩ Accuracy: ±1.25% of fsd on a 2.8“ (71.1 mm) arc length Nominal Test DC: 100 V, 250 V, 500 V, 1000 V. - Page 11 70 % RH max. at 68 °F (20 °C), 60 % RH max. at 95 °F (35 °C), 50 % RH max. at 105 °F (40 °C) Humidity storage: 95 % RH max. at 95 °F (35 °C) www.megger.com MJ159...
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Page 12: Accessories
Accessories 5. Accessories ORDERING INFORMATION Description Part number Description Part number MJ159 Hand-cranked insulation tester 6410-863 Optional accessories Fuses 500 mA, 600 V (F) H.B.C. [pk of 5] 6121-561 Included accessories “A Stitch in Time” manual AVTM21-P8B User guide (all three models) -
Page 13: Application Notes
6. Application Notes 6.1. Preventive maintenance The proverb ‘A stitch in time saves nine’ inspired the title of a Megger Limited booklet on insulation testing, as it neatly sums up the benefits of preventive maintenance. The savings come in INSULATION TEST RECORD... -
Page 14: Insulation Testing Concepts
It is this current that is affected by moisture, dirt etc. and the degree to which it flows bears a direct relation to the quality of the insulation, and consequently to the value of the insulation resistance measured. An increase in the leakage current is a pointer to possible future problems. MJ159 www.megger.com... -
Page 15: Instrument Repair And Spare Parts
7.2.1. Approved Repair Companies A number of independent instrument repair companies have been approved for repair work on most Megger instruments, using genuine Megger spare parts. Consult the Appointed Distributor / Agent regarding spare parts, repair facilities and advice on the best course of action to take. - Page 16 +44 (0)1 304 502101 +46 08 510 195 00 uksales@megger.com seinfo@megger.com Megger Valley Forge Megger USA - Dallas Megger USA - Fort Collins Phoenixville, PA USA Dallas, TX USA Fort Collins, CO USA +1 610 676 8500 +1 214 333 3201 +1 970 282 1200 USsales@megger.com...
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