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Technical Document Reader
Document
098-024
Name

AT3600 User Manual

Description
The full user manual for the AT3600 transformer tester.
AT3600 User Manual
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Expand 1 Introduction1 Introduction
Expand 2 Getting Started2 Getting Started
Expand 3 Test Program Editor3 Test Program Editor
Expand 4 Using the Server4 Using the Server
Expand 5 Fixtures5 Fixtures
Expand 6 Front Panel Operation6 Front Panel Operation
Collapse 7 Tests and Test Conditions7 Tests and Test Conditions
Collapse 7.1 Transformer Tests7.1 Transformer Tests
7.1.1 Application Of Tests
7.1.2 Continuity
7.1.3 Winding Resistance
7.1.4 Equivalent Resistance
7.1.5 Inductance
7.1.6 Inductance With Bias Current
7.1.7 Quality Factor
7.1.8 Dissipation Factor
7.1.9 Leakage Inductance
7.1.10 Inter-Winding Capacitance
7.1.11 Turns Ratio
7.1.12 Turns Ratio By Inductance
7.1.13 Impedance - Impedance With Bias
7.1.14 Dc Resistance Match
7.1.15 Inductance Match
7.1.16 Capacitance Match
7.1.17 General Longitudinal Balance
7.1.18 Longitudinal Balance
7.1.19 Insertion Loss
7.1.20 Frequency Response
7.1.21 Return Loss
7.1.22 Impedance Phase Angle
7.1.23 Inter-Winding Phase
7.1.24 Trimming Adjustment
7.1.25 Output To User Port
7.1.26 Insulation Resistance
7.1.27 Hi Pot (DC)
7.1.28 Hi Pot (AC)
7.1.29 Surge Stress Test
7.1.30 Wattage
7.1.31 Wattage (External Source)
7.1.32 Stress Wattage
7.1.33 Stress Wattage (External Source)
7.1.34 Magnetizing Current
7.1.35 Magnetizing Current (External Source)
7.1.36 Open Circuit Voltage
7.1.37 Open Circuit Voltage (External Source)
7.1.38 Low Voltage Open Circuit
7.1.39 Leakage Current
7.1.40 Inductance With Ext Bias (Series Circuit)
7.1.41 Inductance With Ext Bias (Parallel Circuit)
7.1.42 Impedance With External Bias
7.1.43 Hi Pot Ramp (AC)
7.1.44 Hi Pot Ramp (DC)
7.1.45 Voltage Break Down (AC)
7.1.46 Voltage Break Down (DC)
Expand 8 Specification8 Specification
Expand 9 Warranty and Service9 Warranty and Service
Expand 10 Safety Systems10 Safety Systems

7.1 Available Transformer Tests and Test Conditions

7.1.1 Application Of Tests

The following table summarizes the tests available for the AT3600 and indicates where they might be used:

Test Description Main Application Winding Tested Reason for Test
CTY Continuity All transformers � 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)
QL Quality Factor �
RLS Equivalent Series
Resistance
Right grade of core material
Core correctly assembled
Check for shorted turns
RLP Equivalent Parallel
Resistance
D Dissipation Factor
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
LLO
C Interwinding Capacitance High frequency transformers
Isolating transformers
� 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
MAGI Magnetising Current Usually line frequency
transformers
One winding, usually the
primary
Correct primary turns
Correct core material properly
assembled
MAGX MAGI (External Source)
VOC Open Circuit Voltage All other windings Correct secondary turns
Correct phasing
VOCX VOCX (External Source)
LVOC Low Voltage Open Circuit
IR Insulation Resistance All transformers Between selected windings Winding isolation check where
safety is not involved
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)
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)
WATT Wattage 50Hz Iron core transformers One winding Correct core material
Properly assembled
WATX WATT (External Source)
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 Line frequency & High
Frequency Transformers
One Winding (Usually the
primary)
Checks integrity of inter-turn
insulation, the magnetic material
and joints
STRX STRW (External Source)
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 Select Windings Checks impedance at a given
frequency, while applying a
greater bias current than is
possible with ZB test.
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)
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)

* These tests require the use of one or more Voltech DC1000 Precision DC Bias Current Sources. Contact your Voltech sales office for details.

SELF RESONANT FREQUENCY

Practical inductive components are not perfect inductors; they have stray resistances and capacitances associated with them. For certain components, especially those with a low inductance value, the impedance of the stray capacitance can become significant when compared to that of the inductance.

XL = 2πfL �������� XC = � πfC

At a sufficiently high frequency, the capacitive impedance can dominate, making a measurement of the inductance impossible. Under these circumstances, any measurement instrument may report negative inductance values and measurement errors. Should these symptoms be observed, reduce the test frequency to avoid problems.

The frequency at which the inductive impedance equals the capacitive impedance (XL = XC) is known as the self resonant frequency (SRF) of the component. At this point, the phase angle of the impedance (which can be measured using the ANGL test) is zero. At test conditions where the frequency is low enough for problems with capacitive impedance to be negligible, the phase angle will be positive and close to 90 degrees. Therefore an ANGL test can be used during program development to confirm if measurement problems are due to the chosen test frequency approaching the SRF of the part under test. If the angle is significantly less than 90 degrees, consider reducing the test frequency.

Note that stray fixture capacitance will add to the capacitance of the component and reduce the SRF. Performing compensation will remove the effect of stray fixture capacitance on the measurement of capacitance, but cannot remove its effect on SRF.

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USA 1-239-437-0494
EUR 44 1235 861173
ASIA 44-1235-364-001
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or
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