AC08FSM datasheet(161/223 Pages) TECCOR

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Application Notes

AN1006

AN1006 - 9

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3. Set Max Peak Volts to 75 V. (80 V on 370)

4. Set Mode to DC.

5. Set Horizontal knob to Step Generator.

6. Set Vertical knob to approximately 10% of the maximum IH

specified.

Note: Due to large variation of holding current values, the

scale may have to be adjusted to observe holding current.

7. Set Number of Steps to 1.

8. Set Step/Offset Polarity to non-inverted (button extended,

on 577 button depressed).

9. Set Offset by depressing 0 (zero). (Press Aid and Oppose at

same time on 370.)

10. Set Terminal Selector to Step Generator-Emitter Grounded.

Procedure 8: IH(Forward)

To measure the IH (Forward) parameter:

1. Set Polarity to (+).

2. Set Left-Right Terminal Jack Selector to correspond with

location of test fixture.

3. Increase Variable Collector Supply Voltage to maximum

position (100).

4. Set Step Family by depressing Single.

This could possibly cause the dot on the CRT to disappear,

depending on the vertical scale selected).

5. Decrease Variable Collector Supply Voltage to the point

where the line on the CRT changes to a dot. The position of

the beginning point of the line, just before the line becomes a

dot, represents the holding current value.

(Figure AN1006.13)

Figure AN1006.13 IH (Forward) = 8.2 mA

Procedure 9: IH(Reverse)

To measure the IH (Reverse) parameter:

1. Set Polarity to (–).

2. Repeat Procedure 7 measuring IH(Reverse). (Read measure-

ments from upper right corner of the screen.)

Procedure 10: IGT

To measure the IGT parameter:

1. Set Polarity to (+).

2. Set Number of Steps to 1. (Set number of steps to 0 (zero)

on 370.)

3. Set Offset by depressing Aid. (On 577, also set 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 Vertical knob to 50 mA/DIV.

12. Set Step/Offset Polarity to non-inverted position (button

extended, on 577 button depressed).

13. Set Variable Collector Supply Voltage until voltage

reaches 12 V on CRT.

14. After 12 V setting is completed, change Horizontal knob to

Step Generator.

Procedure 11: IGT – Quadrant I [MT2 (+) Gate (+)]

To measure the IGT – Quadrant I parameter:

1. Set Step/Offset Amplitude to approximately 10% of rated

IGT.

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 AN1006.14) Measure IGT by follow-

ing horizontal axis to the point where the vertical line passes

through the axis. This measured value is IGT. (On 370, IGT is

numerically displayed on screen under offset value.)

Figure AN1006.14 IGT in Quadrant I = 18.8 mA

100m

PER

DIV

PER

DIV

PER

()k

DIV

PER

DIV

PER

DIV

PER

DIV

PER

()k

DIV

PER

DIV

IGT

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