CTY |
Continuity |
All transformers |
All windings |
Properly installed fixture |
R |
DC Resistance |
All transformers |
All windings |
Properly installed fixture. Correct wire used. Integrity of terminations |
LS |
Inductance (Series circuit) |
Most transformers, but usually not line frequency transformers |
One winding, usually the primary |
Correct primary turns. Right grade of core material. Core correctly assembled |
LP |
Inductance (Parallel circuit) |
Most transformers, but usually not line frequency transformers |
One winding, usually the primary |
Correct primary turns. Right grade of core material. Core correctly assembled |
QL |
Quality Factor |
Most transformers, but usually not line frequency transformers |
One winding, usually the primary |
Right grade of core material. Core correctly assembled. Check for shorted turns |
RLS |
Equivalent Series Resistance |
Most transformers, but usually not line frequency transformers |
One winding, usually the primary |
Right grade of core material. Core correctly assembled. Check for shorted turns |
RLP |
Equivalent Parallel Resistance |
Most transformers, but usually not line frequency transformers |
One winding, usually the primary |
Right grade of core material. Core correctly assembled. Check for shorted turns |
D |
Dissipation Factor |
Most transformers, but usually not line frequency transformers |
One winding, usually the primary |
Right grade of core material. Core correctly assembled. Check for shorted turns |
LL |
Leakage Inductance |
SMPS transformers Communication transformers Others as applicable |
Selected windings |
Check windings have been installed in the correct position relative to the core |
C |
Interwinding Capacitance |
High frequency transformers. Isolating transformers |
Selected windings |
Check winding positioning.Check insulation thickness between windings |
TR |
Turns Ratio and Phasing |
Most transformers, but usually not line frequency transformers |
All windings |
Check windings have correct turns and phasing |
TRL |
Turns Ratio by Inductance |
As with Turns Ratio but used where there is poor flux linkage between windings. |
All windings |
Check windings have correct turns and phasing |
LVOC |
Low Voltage Open Circuit |
Usually line frequency transformers |
All other windings |
Correct secondary turns. Correct phasing |
IR |
Insulation Resistance |
All transformers |
Between selected windings |
Winding isolation check where safety is not involved |
LSB |
Inductance with Bias Current (Series Circuit) |
Transformers for use in applications where passing significant (dc) bias current is part of the normal operation |
One winding |
Correct number of turns. Right grade of core material. Core correctly assembled. |
LPB |
Inductance with Bias Current (Parallel Circuit) |
Transformers for use in applications where passing significant (dc) bias current is part of the normal operation |
One winding |
Correct number of turns. Right grade of core material. Core correctly assembled. |
OUT |
Output To User Port |
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Allows the AT to perform external switching as part of the test program. |
R2 |
DC Resistance Match |
SMPS, audio & telecom |
All windings |
Checks matching between windings |
L2 |
Inductance Match |
SMPS, audio & telecom transformers |
All windings |
Checks matching between windings |
C2 |
Capacitance Match |
SMPS, audio & telecom transformers |
All Windings |
Checks correct winding position on bobbin |
GBAL |
General Longitudinal Balance |
Audio & telecom transformers |
Selected Windings |
Checks common mode rejection ratio |
LBAL |
Longitudinal Balance |
Audio & telecom transformers |
Selected Windings |
Checks common mode rejection ratio |
ILOS |
Insertion Loss |
Audio & telecom transformers |
Selected Windings |
Checks losses within the transformer |
RESP |
Frequency Response |
Audio & telecom transformers |
Selected Windings |
Checks losses over a range of frequencies |
RLOS |
Return Loss |
Audio & telecom transformers |
Selected Windings |
Checks losses returned by a transformer |
Z |
Impedance |
Audio & telecom transformers |
Selected Windings |
Checks impedance at a given frequency |
ZB |
Impedance + bias |
Audio & telecom transformers |
Selected Windings |
Checks impedance at a given frequency |
ANGL |
Impedance Phase Angle |
Audio & telecom transformers |
Selected Windings |
Finds phase shift between Voltage and Current on a winding. |
PHAS |
Interwinding Phase Test |
Audio & telecom transformers |
Selected Windings |
Measures phase shift between a pair of windings |