LL: Leakage inductance
Ensures that windings are positioned correctly on the bobbin and that any air gap included in the core design is the correct size.
Unit of measurement, Henries. Range 1nH to 1kH with signal level from 1mV to 5V @ 20Hz to 3MHz
Leakage inductance is the inductive component attributable to magnetic flux that does not link primary to secondary windings. Designs may require a specific value of leakage inductance for the correct operation of the circuit into which the transformer will be fitted or it may be necessary to keep the value very low. Measurement of leakage inductance requires the application of a short circuit to secondary windings and this can often present problems in a production environment. The AT series testers eliminate these problems with a unique measurement technique that is described in detail in a separate technical note VPN: 104-105.
Figure 6 Example test entry screen for leakage inductance using the Editor program.