Loop testers stay within specs for longer

Stable calibration is a key feature of the latest LT7, LCB2000 and LCB2500 loop testers from Megger.

Stable calibration, which ensures accurate and dependable results without the need for frequent, time-consuming and inconvenient accuracy checks, is a key feature of the latest LT7, LCB2000 and LCB2500 loop testers from test instrument expert, Megger.

The testers also offer a low-current testing option which allows non-trip testing not only of circuits protected by passive RCDs, but also of those where active (DC-sensitive) RCDs are in use.

"Stable calibration is something we pay very close attention to in our equipment", said Graham Heritage, of Megger, "since calibration drift can lead to inaccurate, and even misleading, results.

At best, this means that time has to be wasted on repeat testing and, at worst, if the problem is not spotted, it may mean that a defective electrical installation is certified as safe".

To ensure dependable operation, all Megger LT7 and LCB2000-series instruments automatically perform self-checks which identify potential problems.

In addition to their dependability, the instruments have also been designed to be versatile and easy to use.

The economical LT7 tests phase-earth and phase-neutral supply loops and, in addition, provides a direct readout of prospective short-circuit current and prospective earth-fault current, eliminating the need for tedious calculations.

LCB2000 and LCB2500 instruments offer a significant step up in features, speed and resolution, as well as including RCD testing facilities.

These models provide a selection of high-current loop tests, faster non-tripping three-wire loop tests, and non-tripping two-wire loop tests, as well as supply voltage and frequency measurement, combined with supply polarity indication.

They are equally suitable for use on single- and three-phase installations, and can perform phase-to-phase, phase-to-neutral and phase-to-earth tests.

All results are shown on a large, easy-to-read liquid crystal display.

The LCB2500 additionally stores the results in a nonvolatile memory, along with connection details, circuit numbers and distribution board references.

Stored data can be downloaded to a PC, or can be output directly to a printer.

A big advantage of this instrument is its ability to conduct live final circuit R1+R2 measurements, which means that circuits do not have to be powered down and disconnected for testing.

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