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