Thyristor Semiconductor Products Page 53 Thyristor

2014 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 12/14/14 Teccor brand Thyristors AN1006 500 A V E R T H O R I Z S T E P I H Figure AN1006.8 I H = 1.2 mA Procedure 6: I GT and V GT To measure the I GT and V GT parameter: 1. Set Polarity to (+). 2. Set Number of Steps to 1. 3. Set Offset by depressing Aid. 4. Set Offset Multiplier to 0 (zero). (Press Aid and Oppose at the 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 2.2 W. ( 2 W sensitive SCRs, set at 0.5 W. ( 0.4 W on 370) 9. Set Horizontal knob to 2 V/DIV. 10. Set Vertical knob to 50 mA/DIV. 11. Increase Variable Collector Supply Voltage until voltage reaches 12 V on CRT. 12. After 12 V setting is completed, change Horizontal knob to Step Generator. Procedure 7: I GT To measure the I GT parameter: 1. Set Step/Offset Amplitude to 20% of maximum rated I GT . Note: R GK should be removed when testing I GT 2. Set Left-Right Terminal Jack Selector to correspond with location of the test fixture. 3. Gradually increase Offset Multiplier until device reaches the conduction point. (Figure AN1006.9) Measure I GT by following horizontal axis to the point where the vertical line crosses axis. This measured value is I GT . (On 370, I GT will be numerically displayed on screen under offset value.) 50 mA V E R T H O R I Z S T E P I GT 10 A 5 K Figure AN1006.9 I GT = 25 A Procedure 8: V GT To measure the V GT parameter: 1. Set Offset Multiplier to 0 (zero). (Press Aid and Oppose at the same time on 370.) 2. Set Step Offset Amplitude to 20% rated V GT . 3. Set Left-Right Terminal Jack Selector to correspond with location of test fixture. 4. Gradually increase Offset Multiplier until device reaches the conduction point. (Figure AN1006.10) Measure V GT by following horizontal axis to the point where the vertical line crosses axis. This measured value is V GT . (On 370, V GT will be numerically displayed on screen, under offset value.) 50 mA PER V E R T DIV PER H O R I Z DIV PER S T E P V GT 200 mV 250m ()k DIV 9m PER DIV Figure AN1006.10 V GT = 580 mV Thyristor and Rectifier Testing Using Curve Tracers (continued)

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