Be confident in your test results

Smaller, lighter and with new options for calibration checking test equipment, Martindale’s PD440SRDX proving unit not only gives your confidence in safety critical voltage measurements, it can also be used to validate the performance of 18th Edition multifunction testers such as the Martindale ET6000 series.

The added CALCHECK functionality of the PD440SRDX model is ideal for identifying potential calibration issues with test equipment prior to certifying a new wiring installation or carrying out a condition report. This is a valuable procedure recognised by electrical contractor assessment bodies to ensure reliable results and avoid unnecessary and expensive retests.

Easily accessible low Ohm and insulation resistance test pads

The four nominal resistance values of 0.5Ω, 1.0Ω, 0.5MΩ, and 1.0MΩ built-in to the new design make it easy to check the calibration consistency of insulation and low resistance ranges on installation testers at any time between annual calibrations. The resistance values have been set to identify potential calibration issues in the ranges, which could lead to an incorrect pass or fail result when certifying an installation. The resistance pads on top of the proving units are clearly labelled and easily accessible with standard test leads, ideal for on-site use.

The PD440SRDX has a maximum output voltage of 440V, so it is compatible with proving operation with most Multifunction testers, which generally have a maximum input voltage of 500/600V.

The unique combination of a proving unit and calibration checker in a new compact design now means it’s easy to stay safe and have confidence in all your essential test equipment wherever you are working.