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086-627
Name

The Voltech Handbook of Transformer Testing

Description
This article covers a wide range of transformer theory and Voltech's testing capability.
The Voltech Handbook of Transformer Testing
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Expand 1 Transformer Basics1 Transformer Basics
Expand 2 Available Tests2 Available Tests
Collapse 3 Examples of Different Transformer Types3 Examples of Different Transformer Types
3.0 Constructing A Test Program
3.1 Using The Editor Software To Create Test Programs
3.2 Testing Line Frequency Transformer
3.3 Testing Miniature Line Frequency Bobbin Transformers
3.4 Testing Switched-Mode Power Supply Transformers
3.5 Pulse Transformer
3.6 Testing Audio Transformers
3.7 Current Transformers
3.8 DC Chokes

3.6 Testing Audio Transformers


This transformer is designed for microphone matching, with the outputs either series or parallel connected to match impedances. The transformer is terminated with flying leads.

The fixture program allows the test program, and all the test results, to refer to the transformer terminal names, in this case the colour of the flying leads.

Recommended measurements for audio transformers

Test

Why?

Winding Resistance To ensure correct wire size has been used
and that wire has not been over tensioned
during winding. Checks connection to
fixture.
Inductance, Q Factor Checks for correct primary turns and
proper core assembly. Confirms that the
core is of the correct material and that no
winding shorts have occurred during
winding or assembly.
Turns Ratio and Phasing Checks that all windings have correct turns
and polarity.
Interwinding Capacitance Checks that windings have been properly
layered with correct tape thickness
between windings.
Leakage Inductance Checks that the windings have been
correctly positioned on the bobbin.
Insulation Resistance Checks insulation e.g. between
secondaries or primary to secondary for
test voltages <850Vdc.

Note: This Audio transformer has a high permeability iron core.

Inductance is the first test so that inductance is not influenced by any magnetization of the core that may occur due to resistance tests.

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