Thyristor Semiconductor Products Page 57 Thyristor

2014 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 12/14/14 Teccor brand Thyristors AN1006 Procedure 14: I GT - Quadrant IV [MT2 (-) Gate (+)] To measure the I GT - Quadrant IV parameter: 1. Set Polarity to (-). 2. Set Step/Offset Polarity by depressing Invert (release button on 577). 3. Set observed dot to top left corner of CRT grid by turning the Horizontal position knob. When Quadrant IV testing is complete, return dot to original position. 4. Repeat Procedure 11. Procedure 15: V GT To measure the V GT parameter: 1. Set Polarity to (+). 2. Set Number of Steps to 1. (Set steps to 0 (zero) on 370.) 3. Set Offset by depressing Aid. 0 (zero) button to Offset. Button is extended.) 4. Set Offset Multiplier to 0 (zero). (Press Aid and Oppose at same time on 370.) 5. Set Terminal Selector to Step Generator-Emitter Grounded. 6. Set Mode to Norm. 7. Set Max Peak Volts to 15 V. ( 16 V on 370) 8. Set Power Dissipation to 10 W. 9. Set Step Family by depressing Single. 10. Set Horizontal knob to 2 V/DIV . 11. Set Step/Offset Polarity to non-inverted position (button extended, on 577 button depressed). 12. Set Current Limit to 500 mA (not available on 577). 13. Increase Variable Collector Supply Voltage until voltage reaches 12 V on CRT. 14. After 12 V setting is complete, change Horizontal knob to Step Generator. Procedure 16: V GT - Quadrant I [MT2 (+) Gate (+)] To measure the V GT - Quadrant I parameter: 1. Set Step/Offset Amplitude to 20% of rated V GT . 2. Set Left-Right Terminal Jack Selector to correspond with location of test fixture. 3. Gradually increase Offset Multiplier until device reaches conduction point. (Figure AN1006.16) Measure V GT by following horizontal axis to the point where the vertical line passes through the axis. This measured value will be V GT . (On 370, V GT will be numerically displayed on screen under offset value.) 50 mA 500 mV PER V E R T DIV PER H O R I Z DIV PER S T E P ()k DIV 9m PER DIV 100m V GT Figure AN1006.16 V GT in Quadrant I = 780 mV Procedure 17: V GT - Quadrant II [MT2 (+) Gate (-)] To measure the V GT - Quadrant II parameter: 1. Set Step/Offset Polarity by depressing Invert (release button on 577). 2. Set Polarity to (+). 3. Set observed dot to bottom right corner of CRT grid by turning the Horizontal position knob. When Quadrant II testing is complete, return dot to original position. 4. Repeat Procedure 16. Procedure 18: V GT - Quadrant III [MT2 (-) Gate (-)] To measure the V GT - Quadrant III parameter: 1. Set Polarity to (-). 2. Set Step/Offset Polarity to non-inverted position (button extended, on 577 button depressed). 3. Repeat Procedure 16. (Figure AN1006.17) 50 mA 100m PER V E R T DIV PER H O R I Z DIV PER S T E P ()k DIV 9m PER DIV 500 mV V GT Figure AN1006.17 V GT in Quadrant III = 820 mV Procedure 19: V GT - Quadrant IV [MT2 (-) Gate (+)] To measure the V GT - Quadrant IV parameter: 1. Set Polarity to (-). 2. Set Step/Offset Polarity by depressing Invert (release button on 577). Thyristor and Rectifier Testing Using Curve Tracers (continued)

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