K0900E70 Datasheet, PDF (154/224 Pages) Teccor Electronics – Thyristor Product Catalog

AN1006
Application Notes
Safety (Cautions and Warnings)
Model 576 Curve Tracer Procedures
Adhere rigidly to Tektronix safety rules supplied with each
curve tracer. No attempt should be made to defeat any of the
safety interlocks on the device as the curve tracer can produce a
lethal shock. Also, older 575 models do not have the safety inter-
locks as do the new models. Take care never to touch any device
or open the terminal while energized.
WARNING: Devices on the curve tracer may be easily dam-
aged from electrical overstress.
Follow these rules to avoid destroying devices:
• Familiarize yourself with the expected maximum limits of the
device.
• Limit the current with the variable resistor to the minimum nec-
essary to conduct the test.
• Increase power slowly to the specified limit.
• Watch for device “runaway” due to heating.
• Apply and increase gate or base drive slowly and in small
steps.
• Conduct tests in the minimum time required.
The following test procedures are written for use with the model
576 curve tracer. (Figure AN1006.1)
See “Model 370 Curve Tracer Procedure Notes” on page
AN1006-16 and “Model 577 Curve Tracer Procedure Notes” on
page AN1006-18 for setting adjustments required when using
model 370 and 577 curve tracers.
The standard 575 model lacks AC mode, voltage greater than
200 V, pulse operations, DC mode, and step offset controls. The
575 MOD122C does allow voltage up to 400 V, including 1500 V
in an AC mode. Remember that at the time of design, the 575
was built to test only transistors and diodes. Some ingenuity,
experience, and external hardware may be required to test other
types of devices.
For further information or assistance in device testing on Tek-
tronix curve tracers, contact the Teccor Applications Engineering
group.
General Test Procedures
Read all manuals before operating a curve tracer.
Perform the following manufacturer’s equipment check:
1. Turn on and warm up curve tracer, but turn off, or down, all
power supplies.
2. Correctly identify terminals of the device to be tested. Refer
to the manufacturer’s guide if necessary.
3. Insert the device into the test fixture, matching the device
and test terminals.
4. Remove hands from the device and/or close interlock cover.
5. Apply required bias and/or drive.
6. Record results as required.
7. Disconnect all power to the device before removing.
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AN1006 - 2
©2002 Teccor Electronics
Thyristor Product Catalog