AEMC DTR-8510 (2136.50) Digital Transformer Ratiometer

The DTR 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 accurately measures primary to secondary turns ratio, while simultaneously displaying polarity and excitation current.

The DTR is fully automatic and uses the IEEE C57.12-90-2006 test method. No user calibration, range selection, hand cranking or tedious balancing is required. At each measurement, the DTR automatically 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.

The DTR 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 in integral H/X reverse protection circuit, guards against the generation of hazardous test voltages normally associated with other transformer ratio measurement instruments.

A Large, dual line alphanumeric LCD with adjustable contrast and backlight guarantees day/night readability. Power is supplied by integral NiMH battery. Batteries are charged by an external smart charger. Both rugged and reliable, the Model 8510 is built into an attractive, sealed structural polypropylene case designed to withstand the rigors of field use.

Up to 10,000 tests can be stored in the DTR’s internal memory and downloaded to a PC for analysis and report generation using the included DataView software.

Constructed using only the highest quality electrical and mechanical components, the DTR sets the standard in advanced design, engineering and workmanship, and it will provide the user with years of accurate and reliable measurements and hassle free test report printouts.

• Measures power transformers, VT/PTs and current transformer CT turns ratios
• Displays turn ratio, excitation current, winding polarity and % deviation from the nameplate values
• Universal voltage (90-240V supply, 50-60Hz) via external smart/fast battery charger; complete charge in less than 4 hours
• Smart/fast battery charger with universal input voltage (100-240V, 50-60Hz) charges batteries in less than 4 hours
• Inernal NiMH battery packs provide up to 10 hours of continuous operation
• Tests performed by exciting the primary and reading the secondary; provides safer conditions for the operator
• Display warns of incorrect lead connection, reverse polarity, open and short circuits
• Easy connection and test setup; no calibration or balancing required
• Large dual display with adjustable contrast ensures clearer visibility in any lighting environment day or night
• Low battery indicator
• Includes 15 foot lead set
• Stores up to 10,000 test results in internal memory automatically or by user selection
• Filter selection to improve test results in electrically noisy environments
• USB port facilitates configuring the instrument and downloading test results
• Inlcudes DataView analysis software and report generation of test data
• EN 61010-1; 50V CAT IV

• Power transformers
• Potential transformers
• Current transformers

• VT/PT Ratio Range: Auto-Ranging 0.8000:1 to 8000:1
• CT Ratio Range: Auto-Ranging 0.8000 to 1000.0
• Accuracy: Ratio <10 to 1: ±0.2% of Reading; Ratio 0 to 1000 to 1: ±0.1% of Reading; Ratio >1000 to 1: ±0.2% of Reading; Ratio 5000 to 8000.0: ±0.25% of Reading
• Excitation Signal: VT/PT Mode: 32Vrms maximum CT Mode: 0 to 1A Auto Level, 0.1 to 5Vrms max.
• Excitation Current Display: Range: 0 to 1000mA; Accuracy: ±2% of Reading ± 2mA
• Excitation Frequency: 70Hz
• Measurement Method: In accordance with ANSI/IEEE C57.12.90™-2006
• Display: LCD 16 character, 2 line, large format, LED backlight, day/night visible
• Languages Supported: English, Spanish, French, Italian, German, Portuguese
• Communication: Optically isolated USB 2.0
• Data Storage: Stores up to 10,000 complete measurements
• Power Source: Rechargeable 12V NiMH battery (included)
• External Charger: 90/240V, 50/60Hz (smart charger)
• Battery Life: Up to 10 hours continuous operation; May not be used while recharging; Low battery LED/LCD indication
• Charging Time: <4 hours
• Weight: 8.1 lbs
• Dimensions: 10.70 x 9.76 x 5.12 “ (272 x 248 x 130 mm)

• AEMC DTR-8510 Datasheet.pdf