1. LV Tests
TEST	DESCRIPTION	Main Application	Winding Tested	Reason for Test
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	n/a	n/a	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

2.HV Tests
TEST	DESCRIPTION	Main Application	Winding Tested	Reason for Test
HPDC	Hi-Pot (DC)	All transformers especially those used for safety insulation	Between selected windings usually primary to secondary, screens and core	High voltage safety insulation
HPAC	Hi-Pot (AC)	All transformers especially those used for safety insulation	Between selected windings usually primary to secondary, screens and core	High voltage safety insulation
ACRT	Hi-Pot Ramp (AC)	All transformers especially those used for safety insulation	Between selected windings usually primary to secondary, screens and core	High voltage safety insulation
DCRT	Hi-Pot Ramp (DC)	All transformers especially those used for safety insulation	Between selected windings usually primary to secondary, screens and core	High voltage safety insulation
ACVB	Voltage Breakdown (AC)	Transformers with MOV fitted	Between selected windings usually primary to secondary, screens and core	High voltage safety insulation
DCVB	Voltage Breakdown (DC)	Transformers with MOV fitted	Between selected windings usually primary to secondary, screens and core	High voltage safety insulation
WATT	Wattage	50Hz Iron core transformers	One winding	Correct core material. Properly assembled
ILK	Leakage Current Test	Medical applications	Between Primary and Secondary Windings	Checks for a common mode current due to capacitance
STRW	Stress Wattage	Line frequency & High Frequency Transformers	One Winding (Usually the primary)	Checks integrity of inter-turn insulation, the magnetic material and joints
SURG	Surge Stress Test	All transformers, especially those using fine wire	Selected windings	To identify shorted turns
MAGI	Magnetising Current	Usually line frequency transformers	One winding, usually the primary	Correct primary turns Correct core material properly assembled
VOC	Open Circuit Voltage	Usually line frequency transformers	All other windings	Correct secondary turns. Correct phasing

3. DC1000
TEST	DESCRIPTION	Main Application	Winding Tested	Reason for Test
LSBX	Inductance with External Bias (Series Circuit)	Wound components that usually carry a significant DC Bias current in normal operation.	Selected Windings	Checks number of turns, right grade of correctly assembled core material, where bias current is greater than LSB test can handle.
LSBX	Inductance with External Bias (Parallel Circuit)	Wound components that usually carry a significant DC Bias current in normal operation.	Selected Windings	Checks number of turns, right grade of correctly assembled core material, where bias current is greater than LPB test can handle.
ZBX	Impedance with External Bias	Audio & Telecom	Selected Windings	Checks impedance at a given frequency, while applying a greater bias current than is possible with ZB test.
4. AC I/F
TEST	DESCRIPTION	Main Application	Winding Tested	Reason for Test
MAGX	MAGI (External Source)	Usually line frequency transformers	One winding, usually the primary	Correct primary turns. Correct core material properly assembled.
VOCX	VOCX (External Source)	Usually line frequency transformers	All other windings	Correct secondary turns. Correct phasing.
WATX	WATT (External Source)	50Hz Iron core transformers	One winding	Correct core material. Properly assembled.
STRX	STRW (External Source)	Line frequency & High Frequency Transformers	One Winding (Usually the primary)	Checks integrity of inter-turn insulation, the magnetic material and joints.

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