The DTR® Model 8500 s is designed for on-site testing of power, potential and current transformers. When connected to a non-energized transformer, the DTR® Model 8500 accurately measures primary to secondary turns ratio, while simultaneously displaying polarity and excitation current.

The DTR® is fully automatic and uses an ANSI/IEEE compliant test method. No user calibration, range selection, hand cranking or tedious balancing is required. At each measurement, the DTR® automatically self-calibrates and checks for open windings/ connections/ circuit breakers, short circuits (excess excitation current), incorrect test lead placement, and reverse polarity.

The DTR® Model 8500 is designed with operator safety in mind. Tests are performed at low voltage and, unlike other ratiometers, step-down excitation is employed. This method, in conjunction with an integral H/X reverse protection circuit, guards against the generation of hazardous test voltages normally associated with transformer ratio measurement instruments.

A large, dual line alpha-numeric LCD display with adjustable contrast and backlight guarantees day/night readability. Power is supplied by integral NiCD battery (included) or by AC line. Batteries are charged automatically during AC operation.