TRANSFORMER TESTS VOLTECH AT3600 USER MANUAL
PAGE 7.1.2. VPN 98 - 024 TESTS AND TEST CONDITIONS
Test Description Main Application Winding Tested Reason for Test
SURG Surge Stress Test
All transformers, especially
those using fine wire
Selected windings To identify shorted turns
TRIM Trimming Adjustment
Transformers with variable /
trimmable components
To adjust transformer to give
specific measured values
OUT Output To User Port
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
STRW Stress Wattage
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
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
ILK Leakage Current Test Medical applications
Between Primary and
Secondary Windings
Checks for a common mode
current due to capacitance
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.
LPBX*
Inductance with External
Bias (Parallel Circuit)
Wound components that
usually carry a significant DC
Bias current in normal
operation.
Select 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.
ACRT Hi-Pot Ramp (AC)
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)
DCVB Voltage Breakdown (DC)
Transformers with MOV fitted
Between selected windings
usually primary to secondary,
screens and core
High voltage safety insulation
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