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Technical Document Reader
Document
098-024
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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
Collapse 6 Front Panel Operation6 Front Panel Operation
Expand 6.1 Introduction6.1 Introduction
6.2 Self Test
Expand 6.3 Execute Mode6.3 Execute Mode
6.4 Fixture Compensation
Expand 6.5 Measure Mode6.5 Measure Mode
Expand 6.6 Program Mode6.6 Program Mode
Expand 7 Tests and Test Conditions7 Tests and Test Conditions
Expand 8 Specification8 Specification
Expand 9 Warranty and Service9 Warranty and Service
Expand 10 Safety Systems10 Safety Systems

6.4 Fixture Compensation

AT3600 tester fixture compensation is equivalent to short-circuit and open-circuit correction on a component analyzer. It eliminates errors due to stray parasitic components on the fixture board itself. These are usually a combination of parallel capacitance between adjacent wires and sockets or pins, and series resistance and inductance along the lengths of wires.

Not all test programs require fixture compensation; and for some programs containing only high power tests, fixture compensation is not possible. As suggested in Chapter 3, it is best to try fixture compensation when performing trial runs on the program as it is being developed. If fixture compensation changes the test results, then it should be applied whenever the program is run in a production situation.

In production test, for optimum accuracy, fixture compensation measurements should be made :-

  1. Whenever the test fixture is changed.
  2. At the beginning of each day or work period.
  3. Whenever a new test program is loaded into the AT for execution

After you have pressed the COMPENSATE soft-key on the front panel, the tester will automatically perform all the compensation measurements and retain the results in internal memory. The compensation factors will then be applied to each transformer as it is tested.

For compensation, first make up a transformer bobbin with shorting links in place of the windings:

To make a shorting bobbin, solder short pieces of wire across the relevant pins of an otherwise blank bobbin. Do not use a bobbin that contains any transformer windings to make up a compensation test part, since this would invalidate the open circuit measurements.

Ensure that DC Bias current is switched off before connecting and disconnecting component under test.

OPERATOR INSTRUCTIONS

After you have entered the name of a program where compensation can be applied, at the next display:

  • Fit the shorting bobbin into the test fixture on the tester.
  • Press the COMPENSATE soft-key.

The tester will perform the short and open circuit compensation.

As the compensation measurements are being made, the display will briefly show:

The tester will then show:

COMPENSATION PASS AND FAIL INDICATIONS


In the event of a failure check the following:

  • The short circuit connections (if applicable)
  • The fixture integrity.

And then retry the compensation.

If desired the test programs can be run without fixture compensation being performed, however this may affect the accuracy of the results, depending upon the type of transformer being tested and the fixture design.

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