DO4000: Keeping rail resistance measurement and testing on track

It can also be used as part of a signal maintenance and refurbishment schedule, notably for the quick and accurate checking of signal wire integrity.

The DO4000 enables forward and reverse current measurement with auto averaging, true current zero, long scale length and a selectable measurement range from 40m to 4k with respective resolutions between 10 and 1.

Within the range, model 4001 also includes temperature compensation, with preset coefficients for copper and aluminium plus user settable coefficients for other materials. Temperature measurement over the range –50 to +800ºC is also available.

Protection up to 415V rms is provided at the measurement terminals and push button operation is achieved easily by clearly marked function controls. Direct reading measured values are displayed on a four-digit LCD display.

Over range and low battery indication is also provided and warning LEDs illuminate when an open circuit lead condition is detected. The 4000 series can be supplied with [long leads to allow for accurate measurement of large blades] and a rechargeable battery option includes a battery pack, docking station and charger.