Voltech AT5600, Руководство пользователя

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C H A P T E R 1 3 – T E S T F I X T U R E S
AT5600 User Manual 98-119 issue 14
Page 266
13.5.2. Equipment Required
Short Circuit Compensation
A shorting bobbin is a required for short circuit compensation.
The aim here is to place a short across every winding defined in your test
program
This is normally a transformer bobbin with each winding replaced with a short
circuit. To make a shorting bobbin, solder short pieces of wire across the relevant
pins of either a) a blank bobbin or b) a completed transformer.
For simplicity, and flexibility you can short all pins, even if some are not used.
This will give you a S/C bobbin that can be used for ANY transformer based on
the same bobbin.
Open Circuit Compensation
For Open Circuit compensation, an empty bobbin should be used.
The aim here is to connect each Source and Measure pair on each of the 20
nodes that are used in your test program.
This allows the unit to measure the parasitic effect of the fixture and leads up to
the point of contact with the transformer. This also allows any contact resistance
in the connection of the pins/leads to transformer to be removed from your
measurements.
If using a fixture with Kelvin blades, this ensures that source and measure sides of
each blade pair are connected.
Load Compensation
A ‘ Standard Reference Component’ is measured by a calibrated instrumen t. The
value measured, Nominal Value, is then entered into the test program in the Load
Compensation box. The results returned by the AT are then adjusted to
compensate any stray parasitic from the system.
i.e. Standard Reference Component;