TEST
|
DESCRIPTION
|
TRANSFORMER
APPLICATION
|
REASON
FOR TEST
|
CTY
|
Continuity
|
All
|
Properly
installed fixture and part
|
R
|
DC
Resistance
|
All
|
Properly
installed fixture and part, correct wire used, integrity of terminations
|
LS
|
Inductance
(Series circuit)
|
Most,
but not usually line frequency
|
Checks
primary turns, right grade of correctly assembled core material
|
LP
|
Inductance
(Parallel circuit)
|
QL
|
Quality
Factor
|
Checks
right grade of correctly assembled core material, and for short
turns
|
RLS
|
Equivalent
Series Resistance
|
RLP
|
Equivalent
Parallel Resistance
|
LSB
|
Inductance
with Bias Current (Series Circuit)
|
Transformers
that carry a significant dc bias current in normal operation
|
Check
number of turns, right grade of correctly assembled core material
|
LPB
|
Inductance
with Bias Current (Parallel Circuit)
|
LS
|
Inductance
Match
|
SMP,
audio and telecom
|
Checks
matching between windings
|
LL
|
Leakage
inductance
|
SMP,
electronic ballasts
|
Check
windings have been installed in the correct position relative
to the core
|
LLO
|
C
|
Interwinding
Capacitance
|
High
frequency isolation
|
Check
winding positioning and insulation thickness between windings.
|
C2
|
Capacitance
Match
|
SMPS,
but usually not line frequency
|
Check
correct winding position on bobbin
|
TR
|
Turns
Ratio and Phasing
|
Most,
but usually not line frequency
|
Check
windings have correct turns and polarity
|
TRL
|
Turns
Ratio by Inductance
|
Check
windings have correct turns
|
MAGI
|
Magnetising
Current
|
Usually
line frequency
|
Check
primary turns and correct core material properly assembled
|
VOC
|
Open
Current Voltage
|
Check
secondary turns and phasing
|
IR
|
Insulation
Resistance
|
All
|
Check
winding isolation where safety is not involved
|
HPDC
|
Hi-Pot
(DC)
|
All
and especially those used for safety insulation
|
Check
high voltage safety insulation
|
HPAC
|
Hi-Pot
(AC)
|
WATT
|
Wattage
|
Line
frequency
|
Right
grade of correctly assembled core material
|
STRW
|
Stress
Wattage
|
Line
frequency and high frequency
|
Check
integrity of interturn insulation, the nagnetic material and joints
|
SURG
|
Surge
Stress Test
|
All,
especially those with fine wire
|
Check
interturn insulation, identify shorted turns
|
ILK
|
Leakage
Current
|
Allisolating,
especially medical
|
Check
for leakage of line current to ground
|
GBAL
|
General
Longitudinal Balance
|
Audio
and telecom
|
Checks
common mode rejection ratio
|
LBAL
|
Lonitudinal
Balance
|
Audio
and telecom
|
Checks
common mode rejection ratio
|
ILOS
|
Insertion
Loss
|
Audio
and telecom
|
Checks
power lost within the transformer
|
RLOS
|
Return
Loss
|
Audio
and telecom
|
Checks
power lost within the transformer
|
Z
|
Impedance
|
Audio
and telecom
|
Checks
imedance at given frequency
|
ANGL
|
Impedance
Phase Angle
|
Audio
and telecom
|
Checks
phase angle of complex impedance
|
PHAS
|
Interwinding
Phase Angle
|
Measuring
and signal
|
Checks
phase of voltage between windings
|
TRIM
|
Trimming
Adjustment
|
Transformers
with variable / trimming components
|
To
adjust transformer parameter to desired value during test
|
OUT
|
Output
to User Port
|
|
Perform
external switching as part of the test program
|