Thyristor Semiconductor Products Page 64 Thyristor

2014 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 12/14/14 Teccor brand Thyristors AN1006 PROGRAMMABLE CURVE TRACER SETUP MEMORY DISPLAY INTENSITY POSITION GPIB PLOTTER STEP GENERATOR AUX SIPPLY STEP/OFFSET AMPLITUDE CURSOR MEASUREMENT HORIZONTAL VOLTS/DIV VERTICAL CURRENT/DIV OFFSET POLARITY COLLECTOR SUPPLY VARIABLE C B E C SENSE E SENSE B SENSE C B E C SENSE E SENSE B SENSE POWER MAX PEAK POWER WATTS TERMINAL JACKS GATE/TRIGGER MT2/ANODE MT1/CATHODE VARIABLE COLLECTOR SUPPLY VOLTAGE RANGE TERMINAL SELECTOR VARIABLE COLLECTOR SUPPLY VOLTAGE MAX PEAK POWER (POWER DISSIPATION) OFFSET STEP/OFFSET AMPLITUDE (AMPS/VOLTS) STEP/OFFSET POLARITY HORIZONTAL VOLTAGE CONTROL Note: All Voltage Settings Will Be Referenced to "Collector" CRT LEFT-RIGHT SELECTOR FOR TERMINAL JACKS LEFT RIGHT BOTH KELVIN TERMINALS USED WHEN MEASURING V TM OR V FM COLLECTOR STEP FAMILY MAX PEAK VOLTS POLARITY VERT/DIV CURSOR HORZ/DIV CURSOR PER STEP OFFSET OR gm/DIV AUX SUPPLY CONFIGURATION Figure AN1006.27 Tektronix Model 370 Curve Tracer Model 577 Curve Tracer Procedure Notes Because the curve tracer procedures in this application note are written for the Tektronix model 576 curve tracer, certain settings must be adjusted when using model 577. Model 576 curve tracer has separate controls for polarity (AC,+,-) and mode (Norm, DC, Leakage), whereas Model 577 has only a polarity control. The following table shows the guidelines for Model 576 Model 577 If using Leakage mode along with polarity setting of +(NPN) and -(PNP),[vertical scale divided by 1,000], set Collector Supply Polarity to either +DC or -DC , depending on polarity setting specified in the procedure. The vertical scale is read directly from the scale on the control knob. If using DC mode along with either +(NPN) or -(PNP) polarity, set Collector Supply Polarity to either +DC or -DC depending on polarity specified. If using Norm mode along with either +(NPN) or -(PNP) polarity, set Collector Supply Polarity to either +(NPN) or -(PNP) per specified procedure. If using Norm mode with AC polarity, set Collector Supply Polarity to AC. One difference between models 576 and 577 is the Step/ Offset Polarity setting. The polarity is inverted when the button is depressed on the Model 576 curve tracer. The Model 577 is opposite - the Step/Offset Polarity is when the button is depressed. The Step/Offset Polarity is used only when measuring I GT and V GT of Triacs and Quadracs in Quadrants l through lV. Thyristor and Rectifier Testing Using Curve Tracers (continued)

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