Effective Transformer Test and LF Coil Testing
Publication Number: 5967-5377E
Publication Date: 2017.12.05
Language: English
Application Notes

Effective Transformer Test and LF Coil Testing

Show Description

Transformers and LF coils are used in power supplies, digital networks (for example, ADSL) and various communication instruments to step up (or down) an AC voltage or for impedance conversion or filtering purposes. Though production of transformers is increasing year after year, there are problems that QA test efficiency and production test throughput cannot be easily improved because several different measurement instruments and setups need to be used for testing various transformer parameters. This application note introduces the cost-effective solutions to the transformer parameter measurements by using the Keysight Technologies, Inc. 4263B LCR Meter.

 

Current Problems on Transformer/LF Coil Evaluation

The primary parameters that need to be known for transformer/LF coils are self-inductance, DC resistance, turns ratio and inter-winding capacitance. Conventional low-cost LCR meters have the following shortcomings when used for transformer/LF coil evaluation.