The DTR® Model 8510 is a portable digital transformer ratiometer designed for on-site testing of power, potential and current transformers. When connected to a non-energized transformer, the DTR® Model 8510 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. Measurements are displayed quickly and accurately..Includes:NiMH batteries (installed)115V power cordSet of two 15 ft leads10 ft USB cableExternal battery charger (90-264Vac 50/60Hz)Soft carrying caseUSB Stick Supplied with DataView® software and user manualNo 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. Measurements are displayed quickly and accurately.Features:Ratio Testing: PT/VT from 0.8000:1 to 8000:1 and CT from 0.8000 to 1000.0 (Auto-Ranging)Tests performed by exciting the primary and reading the secondary; provides safer conditions for the operator on step-down transformersContinuity test indicates open or loose (high resistance) terminal connectionsDC test mode eliminates errors due to magnetic build upStores up to 10 primary/secondary nameplate voltages to use in comparing test resultsDisplays ratio, test current, winding polarity, and deviation from nameplate voltage or ratioStores up to 10,000 test resultsDataView® software included which allows configuring the instrument, downloading stored measurements and printing of test results in a report formatDisplay warns of incorrect lead connection, reverse polarity, open and short circuitsApplications:Power transformersPotential transformersCurrent transformers.