Motors put to the test
Cropico’s DO7 digital microhmmeters have been specified for a company that makes rotating electrical machines and specialises in the repair, maintenance and service of large electric motors and generators for
global customers.
Quartzelec, a leading electrical engineering company whose engineering operation is based at Rugby, provides a range of specialised service and support solutions for rotating plant installed in power stations, steelworks and paper mills in Europe, North Africa, the Middle East and Far East.
Now, in a move to improve aftersales service and support, the company has equipped its team of electrical and mechanical service engineers with DO7 units to enable them to undertake on-site resistance measurement and status checking of electric motors and generators.
These are replacing Quartzelec’s own ageing in-house testing units and have been specified because of the superior features and benefits provided. Not only is the DO7 highly accurate but the flexibility of the in-built manual default is enabling engineers to undertake on-site multi-testing of machinery very quickly. Other benefits include high portability and a rugged design, enabling the DO7 to be carried easily from site-to-site and providing high impact resistance. Ian Martin, Quartzelec’s engineering manager, said: “We have been extremely pleased with the Cropico DO7 units since they were introduced a few months ago. It’s a very easy-to-use instrument, even in the harshest of environments, producing very good testing data. Because of this we have now gone ahead and ordered further units for our North African operations.”
Cropico DO7 digital
microhmmeters come with specially developed handspike test leads to add increased accuracy to the unit’s rugged portable construction, simplifying repeatable low resistance measurements in the workshop or field.
The HSO series leads are robust and easy to use, with a different handgrip design than conventional handspikes allowing them to be held in any position needed for each application. Offered with a choice of a remote start button for increased versatility and a range of lead lengths, they give accurate and long-term
measurement repeatability. Remote start and operation is possible up to 15 meters enabling real hands-free use.
Built within a sealed ABS plastic case having a lid and carrying handle, the instrument offers pushbutton selectable ranges of 600mW to 60W with resolutions between 0.1mW and 10mW. Full portability is provided by mains/rechargeable battery power giving over 1 hour of continuous working on the lowest ranges and 20 hours’ operation on all others.
The latest models also feature input protection up to 415V rms, keyprotected digital calibration and a long
scale length of 6000 count displayed on a super-bright daylight viewable 0.8in LED with automatic decimal point and polarity indication. They offer 10A measuring current on the lowest ranges, plus forward and reverse measurement with an auto-averaging provision, with true 4-wire measurement eliminating lead
resistance errors.
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