1.
LV Tests
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TEST
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DESCRIPTION
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Main
Application
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Winding
Tested
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Reason
for Test
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CTY
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Continuity
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All
transformers
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All
windings
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Properly
installed fixture
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R
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DC
Resistance
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All
transformers
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All
windings
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Properly
installed fixture. Correct wire used. Integrity of terminations
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LS
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Inductance
(Series circuit)
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Most
transformers, but usually not line frequency transformers
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One
winding, usually the primary
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Correct
primary turns. Right grade of core material. Core correctly
assembled
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LP
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Inductance
(Parallel circuit)
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Most
transformers, but usually not line frequency transformers
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One
winding, usually the primary
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Correct
primary turns. Right grade of core material. Core correctly
assembled
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QL
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Quality
Factor
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Most
transformers, but usually not line frequency transformers
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One
winding, usually the primary
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Right
grade of core material. Core correctly assembled. Check for
shorted turns
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RLS
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Equivalent
Series Resistance
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Most
transformers, but usually not line frequency transformers
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One
winding, usually the primary
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Right
grade of core material. Core correctly assembled. Check for
shorted turns
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RLP
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Equivalent
Parallel Resistance
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Most
transformers, but usually not line frequency transformers
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One
winding, usually the primary
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Right
grade of core material. Core correctly assembled. Check for
shorted turns
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D
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Dissipation
Factor
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Most
transformers, but usually not line frequency transformers
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One
winding, usually the primary
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Right
grade of core material. Core correctly assembled. Check for
shorted turns
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LL
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Leakage
Inductance
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SMPS
transformers Communication Transformers Others as applicable
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Selected
windings
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Check
windings have been installed in the correct position relative to
the core
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C
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Interwinding
Capacitance
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High
frequency transformers. Isolating transformers
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Selected
windings
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Check
winding positioning. Check insulation thickness between windings
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TR
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Turns
Ratio and Phasing
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Most
transformers, but usually not line frequency transformers
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All
windings
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Check
windings have correct turns and phasing
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TRL
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Turns
Ratio by Inductance
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As
with Turns Ratio but used where there is poor flux linkage
between windings.
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All
windings
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Check
windings have correct turns and phasing
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LVOC
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Low
Voltage Open Circuit
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Usually
line frequency transformers
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All
other windings
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Correct
secondary turns. Correct phasing
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IR
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Insulation
Resistance
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All
transformers
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Between
selected windings
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Winding
isolation check where safety is not involved
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LSB
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Inductance
with Bias Current (Series Circuit)
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Transformers
for use in applications where passing significant (dc) bias
current is part of the normal operation
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One
winding
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Correct
number of turns. Right grade of core material. Core correctly
assembled.
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LPB
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Inductance
with Bias Current (Parallel Circuit)
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Transformers
for use in applications where passing significant (dc) bias
current is part of the normal operation
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One
winding
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Correct
number of turns. Right grade of core material. Core correctly
assembled.
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OUT
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Output
To User Port
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n/a
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n/a
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Allows
the AT to perform external switching as part of the test
program.
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R2
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DC
Resistance Match
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SMPS,
audio & telecom
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All
windings
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Checks
matching between windings
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L2
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Inductance
Match
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SMPS,
audio & telecom transformers
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All
windings
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Checks
matching between windings
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C2
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Capacitance
Match
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SMPS,
audio & telecom transformers
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All
Windings
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Checks
correct winding position on bobbin
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GBAL
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General
Longitudinal Balance
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Audio
& telecom transformers
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Selected
Windings
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Checks
common mode rejection ratio
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LBAL
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Longitudinal
Balance
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Audio
& telecom transformers
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Selected
Windings
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Checks
common mode rejection ratio
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ILOS
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Insertion
Loss
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Audio
& telecom transformers
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Selected
Windings
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Checks
losses within the transformer
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RESP
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Frequency
Response
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Audio
& telecom transformers
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Selected
Windings
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Checks
losses over a range of frequencies
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RLOS
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Return
Loss
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Audio
& telecom transformers
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Selected
Windings
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Checks
losses returned by a transformer
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Z
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Impedance
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Audio
& telecom transformers
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Selected
Windings
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Checks
impedance at a given frequency
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ZB
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Impedance
+ bias
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Audio
& telecom transformers
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Selected
Windings
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Checks
impedance at a given frequency
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ANGL
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Impedance
Phase Angle
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Audio
& telecom transformers
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Selected
Windings
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Finds
phase shift between Voltage and Current on a winding.
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PHAS
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Interwinding
Phase Test
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Audio
& telecom transformers
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Selected
Windings
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Measures
phase shift between a pair of windings
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