S451 Transformer Ohmmeter
- 4-wire DC measurement, up to 10 A
- 500 µΩ–1 MΩ range, depending on test current
- Maximum resolution: 0.1 µΩ
- Cu/Al resistance temperature conversion
- Automatic discharge and back-EMF protection
- 5.6-inch colour LCD and built-in printer
- Storage for up to 9,999 sets of results
- Bluetooth app and PC software for report export
Product Description
The EAGLOTEST S451 is a portable transformer winding resistance tester for factory testing, commissioning and maintenance. It uses four-wire DC measurement with selectable test currents up to 10 A, and supports resistance temperature conversion for copper and aluminium conductors. Automatic discharge and back-EMF protection support testing of inductive windings.
A 5.6-inch colour LCD displays test settings and results, while internal memory stores up to 9,999 sets of results. The built-in printer provides on-site printouts, and the Bluetooth app and PC software support data review and report export.
Technical FAQ
How should the test current be selected?
Select the current according to the winding resistance and the transformer’s test requirements. At 10 A, the specified measurement range is 500 µΩ to 1.5 Ω; lower-current ranges extend measurement up to 1 MΩ. Refer to the current-range table in the user manual.
How does resistance temperature conversion work?
The S451 uses the selected conductor material and the temperature entered by the operator to convert measured resistance to a selected reference temperature. This allows resistance values to be compared at the same reference temperature.
What protection functions does the S451 provide?
The S451 includes back-EMF, open-circuit, power-loss and over-temperature protection, together with automatic discharge and an audible discharge indication. After stopping a test, wait for discharge to complete before disconnecting or moving the test leads, as described in the user manual.
How can test results be saved and exported?
The instrument stores up to 9,999 sets of results and can print them using its built-in printer. Saved data can be transferred to a USB flash drive, while the Bluetooth app and PC software support data review and report export.