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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
Collapse 2 Available Tests2 Available Tests
2.1 CTY - Continuity
2.2 R - Winding Resistance
2.3 RLS or RLP - Equivalent Series or Parallel R
2.4 LS_LP - Primary Inductance
2.5 LSB_LPB - Inductance With Bias Current
2.6 QL - Q factor
2.7 D - Dissipation Factor
2.8 LL - Leakage Inductance
2.9 C - Inter-winding Capacitance
2.10 TR - Turns Ratio and Phasing
2.11 TRL - Turns Ratio by Inductance
2.12 Z_ZB - Impedance_Impedance with Bias
2.13 R2 - DC Resistance Match
2.14 L2 - Inductance Match
2.15 C2 - Capacitance Match
2.16 GBAL - General Longitudinal Balance
2.17 LBAL - Longitudinal Balance
2.18 ILOS - Insertion Loss
2.19 RESP - Frequency Response
2.20 RLOS - Return Loss
2.21 ANGL - Impedance Phase Angle
2.22 PHAS - Inter-winding Phase Test
2.23 TRIM - Trimming Adjustment
2.24 OUT - Output To User Port
2.25 IR - Insulation Resistance
2.26 HPDC - DC HI-POT
2.27 HPAC - AC HI-POT
2.28 SURG - Surge Stress Test
2.29 STRW - Stress Watts
2.30 MAGI - Magnetizing Current
2.31 VOC - Open Circuit Voltage
2.32 WATX - Wattage (External Source)
2.33 STRX - Stress Watts (External Source)
2.34 MAGX - Magnetizing Current (Ext. Source)
2.35 VOCX - O.C. Voltage (External Source)
2.36 LVOC - Low Voltage Open Circuit
2.37 ILK - Leakage Current
2.38 LSBX - Inductance with External Bias (Series)
2.39 LPBX - Inductance with External Bias (Parallel)
2.40 ZBX - Impedance with External Bias
2.41 ACRT - AC HI-POT Ramp
2.42 DCAT - DC HI-POT Ramp
2.43 ACVB - AC Voltage Break Down
2.44 DCVB - DC Voltage Break Down
2.45 WATT - Wattage
2.0 Available Tests On The AT Series
Expand 3 Examples of Different Transformer Types3 Examples of Different Transformer Types

2.20 RLOS - Return Loss

Where Used

The Return loss test measures the impedance mismatch between the transformer and a transmission line of a specified impedance. RLOS is calculated from a measurement of the complex impedance and the specified impedance. This test is suitable for audio & telecommunication transformers and checks the effective input impedance of the transformer in the application.

Measurement Conditions


The load resistor is assumed to be on the fixture, but not shown on the Editor schematic.

It is switched in circuit using an OUT test that must be inserted in the program before the RLOS test.

(The relay patterns associated with inserting and removing fixture resistors have deliberately not been included in the RLOS test dialogue for two reasons: a) it would make the dialogue too complicated, and b) it is not always necessary - e.g. in the case of a fixture where the resistor is permanently fitted in circuit).

The test voltage is applied to the input winding, and the voltage and current measured.

From the measured results, and the reference impedance value (specified by the user in the test dialogue), the return loss is calculated.

The impedances used are complex, where: -

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