Sivananda Automatic Ratio Meter is the first automatic ratio meter in the country giving digital display of ratio directly.

The instrument without any need of balancing precisely & accurately measures the voltage transformation ratio of single phase/3-phase delta or star connected transformers, CTs & PTs, Power Transformers.

Test Voltage : The Instrument provides 3 isolated test voltages of 48V & 4.8V which enable the testing of both power transformers & CTs.

Display : 4 ½ digit LCD displays the ratio i.e. ratio of high voltage winding to low voltage winding at low flux in the core. Ratio is displayed in three ranges i.e.1-10,10-100,100-1000 by auto ranging.

Principle of operation: This Instrument uses ratio-metric circuit in which the ratio of test specimen is compared with known internal standard.

Protection: Instrument is protected against any wrong connection across the transformer. Fast acting VBo trips in case of stepping up of test voltage.

• Fully auto operation, No balancing is required.
• Measures and displays transformer ratio, Primary & Secondary.
• LED display.
• 4½ digit LED display of ratio.
• True 4 terminal measurement.
• Resolution of 0.001 in the range 10.
• Can be used to measure 3,1 phase delta, star connected transformer.
• Fully protected against any wrong connections.