I. Overview of the semi-finished products of power transformers, finished the production process, before the newly installed transformer into operation and preventive testing procedures according to the national network, the requirements of the regular operation of the transformer turns ratio or voltage ratio test. The traditional ratio bridge operation is complicated, reading is not intuitive, and to make the necessary conversion, only the value of the test results of a phase transition ratio is. DBB-III transformer turns ratio group tester ratio to overcome the traditional shortcomings of the bridge test, the screen with a large-screen high-resolution LCD display, power supply with lithium-powered, convenient field use, with Chinese menu prompts, easy to operate intuitive, once the three-phase ratio test, test speed, accuracy. Second, the performance characteristics of AC and DC 2.1: lithium battery or 220V AC power charger adaptation. 2.2 on a single charge, continuous measurement of 50 transformer turns ratio group. 2.3 intelligent charging management, the remaining battery indicator, low battery alarm, backlight automatically adjust to save power. 2.4 full three-phase sine wave inverter power output, the output voltage is automatically adjusted, with soft start and soft stop function, the test speed, high precision. 2.5 three-phase transformer, single-phase transformer, PT, Z-type transformer turns ratio, group, polarity test function. Test function with angular difference 2.6 single-phase testing. 2.7 tap highest gear can be tested to 197 files. 2.8 test a wide range, up to 5000. 2.9 high and low voltage reverse polarity protection. 2.10 Output short circuit protection. 2.11 does not power down the clock and date display; data is stored into the machine memory and USB storage, including local storage can store test data 100; USB storage data format to Word format, you can directly edit the print on the computer. 2.12 thermal printer, fast, silent. 2.13 small size, light weight, easy to carry and use. Third, technical indicators 3.1 Range: 0.9 to 5000 3.2 Accuracy: ± (reading × 0.1% + 2 words) (less 500) ± (reading × 0.2% + 2 words) (greater than 500 or less 3000) ± (reading × 0.3% + 2 words) (more than 3000) Resolution 3.3: 0.9 to 9.9999 (0.0001) 100 to 999.99 (0.01) 10 to 99.999 (0.001) in 1000 to 4,999.9 (0.1) 3.4 Power supply: built-in battery or an external charger, Chargers conditions of use, input 100-240VAC, 50 / 60Hz 3.5 Charging time: about 3 hours 3.6 Instrument Weight: 4Kg 3.7 Instrument Volume: 252mm (length) × 162mm (width) × 132mm (H) 3.8 Operating temperature: -10 ℃ ~ 50 ℃ 3.9 Relative humidity: <90%, non-condensing power frequency voltage test equipment, SF6 gas recovery, relay tester, battery tester please call the Hubei Electric Power Automation Ltd nanny for more product information and pricing. Products Address: http: //www.hvtest.cn/index.php m = List & a = index & cid = 7 & p = 1?