Tried and tested

A HIGH-performance Cropico microhmemeter is being used by Bureau Veritas to test the safety of cables installed in quarries operated by contractors across the UK.  Electrical circuits installed in quarries must be tested to ensure there has been no damage done during installation and in service.

A low-resistance microhmmeter, with a 10A test current, is usually required for testing in such an application, due to the low resistance of the cables, which cannot be accurately tested using a regular ohmmeter  

Bureau Veritas have, therefore, specified the DO7010 microhmmeter from Cropico to inspect the safety of electrical circuits, eliminating the high risk of fire or electric shocks in the quarry workplace.

‘The accuracy of the DO7010 was a key factor in my decision to use it for testing the quarry installations,’ explained Mahendra Mistry, electrical engineering specialist at Bureau Veritas. ‘It’s also an extremely reliable instrument while being portable and easy to use. It meets all our requirements.’

The DO7010 has been developed for a wide range of electronic engineering, design and manufacturing applications, requiring accurate low-resistance measurement. With a measuring range of 600µΩ to 60Ω with 0.1 and 10mΩ resolution respectively, the instrument can measure with switchable current levels of 1A or 10A except the highest range. Externally recharged NiMh battery packs can be replaced quickly via the front panel to ensure minimum downtime.
 
An LCD panel displays full information on measurement configuration and a single start button ensures ease of use, while the ability to trigger measurements by lead contact to the test device provides fast single-person operation. A remote-hand terminal is also available to fully control the tester at up to 15m.

Other features include a robust design, 4-terminal measurement to eliminate lead resistance errors, auto average of forward/reverse measurement and sequence testing with memory for up to 1,000 readings. The instrument’s data logging function permits downloading of test sequences from a spreadsheet and uploading of test results back to the data records.