The DTR 8510 is a Portable Digital Ratiometer for testing power, voltage and current transformers from Chauvin Arnoux.
A powerful ratio tester, the DTR8510 stores up to 10,000 test results within its internal memory. The DTR 8510 is a second genertation instrument, built from the latest technological advances, improving on its highly successful predocessor (DTr 8500).
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.
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 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