- Used for testing single phase power and distribution transformers
- Design based on precision bridge measuring technique
- Available in hand-cranked or line-operated models
- Unmatched accuracy (±0.1%) in a portable design
The major source of error in a transformer is a primary impedance drop due to magnetizing current, which is kept to a minimum by excitation at a fraction of rated voltage. By employing a design that meets both of these conditions along with the use of a null balance system, the turns ratio of a transformer can be determined accurately.