With its lightweight and rugged suitcase design, it makes the MJÖLNER200 and MJÖLNER600 an excellent choice when a portable solution is needed. When the case is closed, the product can withstand the impact of water, dust or sand – it even floats.Optional accessories are a remote control and PC software.MOM690AThe MOM690A supplements Meggers family of micro-ohmmeters. In addition to high current capacity, the MOM690A features microprocessor based measurement, storage and reporting. The built-in software enables individual tests or a whole series of tests and store the results.With the optional MOMWin™ software test results can also be exported to a PC for further analysis and reporting. Ranges are set automatically, resistances are measured continually and test results an be automatically captured at a preset test current. After a circuit breaker with a Current Transformer (CT) mounted in its current circuit has been tested, e.g. dead tank and GIS breakers, some standards recommended that the CT is demagnetized. This troublesome task can be accomplished quickly and easily thanks to the a.c. output of the MOM690. The a.c. output can also be used as a general multi-purpose current source in different applications.Fig 48: MOM690AMOM200A / MOM600AThe MOM200A™ is designed to check and measure contact resistances in high voltage circuit breakers, disconnecting switches (isolators) and bus bar joints. It is an excellent choice when 200 A or less are needed for measurement.The MOM200A is ideal for finding poor connections, since it can put out 100 A for extended periods. Its range, extending up to 20 millohm, makes it ideal for measuring many different types of connections, and, with its weight at 14 kg (31 lb), it's convenient to take along with you.The MOM600A, with output current between 100 and 660 A, comes in two versions, a 115 V and a 230 V.A complete MOM200A and MOM600A includes a cable set (including separate sensing cables) and a transport case.Fig 49: MOM200A / MOM600ABT51Where economy and simplicity of operation are paramount, the Megger DUCTER BT51 only requires setting the two position range switch. Ranges of 2 A and 20 mA are selectable, with 1 millohm and 0.01 millohm resolution, respectively. The instrument operates with a 2 A test current, provides warning indicators, and is supplied with duplex hand spike leads.Fig 50: BT51Series 247000This traditional line from Megger has been the hallmark of quality and reliability since the emergence of the DLRO, and remains as popular today as ever. Decades of proven field use have made them the defining standard in ruggedness and portability. Three 10 A models in the series offer highest accuracy combined with user friendly ease of operation:Cat. No. 247000 features the tried and popular dual-pak design, where the charger is a separate item that can be left behind while the measuring module affords the maximum in portability. Where self containment is a premium.Cat. No. 247001 combines the measurement module and charger in a single-pak instrument without loss of convenient portability.Cat. No. 247002 is a single-pak instrument as well, with an added range for extra precision, down to 0.1 mA resolution.Fig 51: DLRO247000Duplex connect test lead systemThe Megger Duplex Connect test lead system can be used with the 10 A DLRO and BT51 instruments. Fig 52: Duplex connect test leadsThis test lead system provides the most cost effective and convenient way to provide the user with many test lead lengths, including extensions, and the ability to connect test lead terminations required for the many different applications encountered in low resistance testing. One set of test leads, all the terminations.At the center of this unique test lead system is the bespoke four terminal connectors (two in each test lead), which allows terminations such as kelvin clips or duplex test probes to be used as required. There are two connector versions, one without and one with indicator LEDs, which operate with the DLRO10 range of instruments.www.megger.com 3938 A guide to low resistance testing www.megger.com
