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AN1006

Application Notes

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Procedure 12: IGT – Quadrant II [MT2 (+) Gate (-)]

To measure the IGT – Quadrant II parameter:

1. Set Step/Offside Polarity by depressing Invert (release but-

ton on 577).

2. Set Polarity to (+).

3. Set observed dot to bottom right corner of CRT grid by turn-

ing the horizontal position knob. When Quadrant II testing is

complete, return dot to original position.

4. Repeat Procedure 11.

Procedure 13: IGT – Quadrant III [MT2 (-) Gate (-)]

To measure the IGT – 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 11. (Figure AN1006.15)

Figure AN1006.15 IGT in Quadrant III = 27 mA

Procedure 14: IGT – Quadrant IV [MT2 (-) Gate (+)]

To measure the IGT – Quadrant IV parameter:

1. Set Polarity to (–).

2. Set Step/Offset Polarity by depressing Invert (release but-

ton on 577).

3. Set observed dot to top left corner of CRT grid by turning the

Horizontal position knob. When Quadrant IV testing is com-

plete, return dot to original position.

4. Repeat Procedure 11.

Procedure 15: VGT

To measure the VGT 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. (On 577, also set 0 (zero) but-

ton 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: VGT – Quadrant I [MT2 (+) Gate (+)]

To measure the VGT – Quadrant I parameter:

1. Set Step/Offset Amplitude to 20% of rated VGT.

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 VGT by fol-

lowing horizontal axis to the point where the vertical line

passes through the axis. This measured value will be VGT.

(On 370, VGT will be numerically displayed on screen under

offset value.)

Figure AN1006.16 VGT in Quadrant I = 780 mV

Procedure 17: VGT – Quadrant II [MT2 (+) Gate (-)]

To measure the VGT – Quadrant II parameter:

1. Set Step/Offset Polarity by depressing Invert (release but-

ton on 577).

2. Set Polarity to (+).

3. Set observed dot to bottom right corner of CRT grid by turn-

ing the horizontal position knob. When Quadrant II testing is

complete, return dot to original position.

4. Repeat Procedure 16.

Procedure 18: VGT – Quadrant III [MT2 (-) Gate (-)]

To measure the VGT – Quadrant III parameter:

1. Set Polarity to (–).

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

extended, on 577 button depressed).

PER

DIV

PER

DIV

PER

()k

DIV

PER

DIV

IGT

500

PER

DIV

PER

DIV

PER

()k

DIV

PER

DIV

100m

VGT

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