The DTR® Model 8511 is an easy-to-use portable digital transformer turns ratiometer designed for on-site testing of power, potential and current transformers. When connected to a non-energized transformer, the DTR® Model 8511 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.
The Digital Transformer Ratiometer DTR® 8511 takes the proven reliability of the DTR® 8510 and elevates it with a range of enhancements. While maintaining the fully automatic VT/PT and CT testing functions that technicians trust for accurate ratio and excitation current measurements, the DTR® 8511 delivers a lighter, more ergonomic design with advanced safety features built in. A brighter, larger display improves visibility in any environment, while an oversized test button allows for easy operation, even with gloves on. The DTR® 8511 makes transformer ratio testing fast, accurate, and hassle-free. Designed for the field, it's fully automatic. No calibration, range selection, hand cranking or tedious balancing required—no wasted time! Built-in checks catch lead reversals and opens, giving you confidence in every measurement. Results display quickly, including turns ratio, excitation current, and nameplate deviation, so you know exactly what you're working with. You can also save nameplate voltages and compare results in real time as data is gathered. Test data can then be downloaded to a PC and analyzed with the included DataView® software, which also provides full instrument control. When connected via the isolated USB interface, results can be managed and reviewed through the DTR® Control Panel for streamlined reporting and analysis.
- 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 transformers
- Continuity test indicates open or loose (high resistance) terminal connections
- DC test mode eliminates errors due to magnetic build up
- Stores up to 10 primary/secondary nameplate voltages to use in comparing test results
- Displays ratio, test current, winding polarity, and deviation from nameplate voltage or ratio
- Stores up to 10,000 test results
- DataView® software included which allows configuring the instrument, downloading stored measurements and printing of test results in a report format
- Display warns of incorrect lead connection, reverse polarity, open and short circuits
- LCD 20 Characters x 4 Line Display
- USB Type-C and 12 Vdc Charger
Applications
- Testing transformers
- Pole mount transformer continuity and ratio tests
- Switchgear CPT
- Nameplate verification, commissioning and maintenance testing of frequently used transformers in industrial power distribution
- Quality control in transformer manufacturing and rewinding
Each Unit Includes
- DTR Digital Transformer Ratiometer
- NiMH Batteries (Installed)
- 115 V Power Cord
- 2 x 15' (4.6 m) Leads
- 10' (3 m) USB Cable
- External Battery Charger (90-264 V AC, 50/60 Hz)
- DataView Software
- Manual
- Soft Carrying Case
